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Category: Science Notes

The problem isn't making a mistake
A couple of weeks back Roger Pielke Jr. called sending RCP8.5 to the glue factory “The most significant development in...
03 Jun, 2026| Science Notes

#DoEDeepDive: The scale problem
Wrapping up our look at last summer’s DOE contrarian climate report, which is looking less contrarian and more prescient as...
27 May, 2026| Science Notes

#DoEDeepDive: Opening the SCC black box
In this week’s deep dive into last summer’s contrarian US Department of Energy climate report we look at Section 11.2,...
20 May, 2026| Science Notes

#DoEDeepDive: Crop modeling studies
We noted last week that Chapter 9 of last summer’s contrarian US Department of Energy Report on climate found mixed...
29 Apr, 2026| Science Notes

Tornado damage rates swept away
If a major tornado were to sweep through Ottawa, or indeed any town, the usual ghouls would be out in...
29 Apr, 2026| Science Notes

The effect of CO2 on Grey Mangrove
From the CO2Science Archive: Avicennia marina sounds like a place to moor your boat. And indeed sometimes you actually could...
15 Apr, 2026| Science Notes

#DoEDeepDive: Climate impact drivers
In chapter 8.5 of last summer’s US Department of Energy contrarian Red Team climate report they look at a bit...
08 Apr, 2026| Science Notes

Warming and wealth save lives
H/T No Tricks Zone we learned of a new study in a journal called Current Problems in Cardiology (to borrow...
08 Apr, 2026| Science Notes

So about that drought
Large parts of the US, especially in the west, are experiencing a heatwave, on the heels of much of the...
01 Apr, 2026| Science Notes

#DoEDeepDive: Sea levels
Chapter 7 in the DOE “red team” climate report released last summer is about rising sea levels. The first part...
18 Mar, 2026| Science Notes

An Arctic sea ice surprise
Last week we discussed the new paper by Prof. Qing-Bin Lu updating his “CRE” model comparisons against atmospheric data. That...
18 Mar, 2026| Science Notes

The #CRE challenge: a new update
In 2024 we profiled a bold study by University of Waterloo physicist Qing-Bin Lu who argued that CO2 is not...
11 Mar, 2026| Science Notes

The effect of CO2 on Barnyard Grass
From the CO2Science archive: This one has a simple homely English name but a real mouthful in Latin, Echinochloa crus-galli...
11 Mar, 2026| Science Notes

We heard it through the grapevine
From the CO2Science archive: We frequently report good news in this series about the beneficial effects of CO2 on food...
04 Mar, 2026| Science Notes

Dutch trick
As we mentioned last week, the Royal Dutch Meteorological Agency (KNMI) has been forced to admit that they artificially scrubbed...
18 Feb, 2026| Science Notes

#DoEDeepDive: Ch. 6 on extreme weather
Last summer’s “red team” climate report from the US Department of Energy began its review of extreme weather by showing...
11 Feb, 2026| Science Notes

The Stern review 20 years later
Does anyone remember the Stern Review? Ah, sic transit gloria mundi, because it was a big deal in 2006. Sir...
11 Feb, 2026| Science Notes

#DoEDeepDive: More model mismatches
The last half of Chapter 5 in last summer’s U.S. Department of Energy “red team” contrarian climate report looks at...
04 Feb, 2026| Science Notes

Grin and polar bear it
From time to time we have turned our attention to the poor beleaguered polar bears… from a safe distance. These...
04 Feb, 2026| Science Notes

The effect of CO2 on Goldenclub
From the CO2Science Archive: The common name for Orontium aquaticum L. sounds like a James Bond film. Goldenclub. (Cue catchy...
04 Feb, 2026| Science Notes

The real extinction rebellion
Never mind the lunatics blocking traffic, or the Swedish scold declaring that we are in the beginning of a mass...
28 Jan, 2026| Science Notes

The effect of CO2 on soybean
From the CO2Science archive: Glycine max (L.) Merr. is one of the world’s most important crops. Soybeans are grown around...
28 Jan, 2026| Science Notes

2025: An extreme bust
Speaking of climate change as a religion-like object, it is an article of faith among alarmists that the weather is...
21 Jan, 2026| Science Notes

Don't mention the volcano
Javier Vinós, our guest in a December 2024 podcast, recently posted a detailed essay on Judith Curry’s blog discussing the...
14 Jan, 2026| Science Notes

The effect of CO2 on Geum Vernum
From the CO2Science archive: This week’s plant is native to Ontario and the northeast US and goes by the pleasant...
14 Jan, 2026| Science Notes

#DOEDeepDive: Ch 4 Climate Sensitivity
This Chapter of the DOE Report points out, uncomfortably for the “settled science” crowd, that estimates of the warming response...
07 Jan, 2026| Science Notes

The effect of CO2 on Elliott's Milkpea
From the CO2Science.org archive: The Latin version of this week’s plant sounds like something an astronomer would come up with:...
07 Jan, 2026| Science Notes

Canadian summertime warming trends
Or should we say lack thereof? Dr. Roy Spencer, of the Christy-Spencer satellite data set fame, has posted an analysis...
17 Dec, 2025| Science Notes

Flat-topped bogmoss and extra CO2
From the CO2Science archive: We’re not sure if Sphagnum fallax is what John Lennon had in mind when he wrote...
17 Dec, 2025| Science Notes

Silver fur and CO2
From the CO2Science Archive: ‘Tis the season when we go boldly into the snowy woods with our axe in hand...
10 Dec, 2025| Science Notes

#DOEDeepDive: Chapters 1 and 2
This week we start a new series in which we go through last summer’s DOE Climate Report chapter by chapter....
26 Nov, 2025| Science Notes

#HaveItBothWays: Drought in the UK
Although we may tend to picture the UK as perennially damp and rainy, dear old Blighty is no stranger to...
19 Nov, 2025| Science Notes

Climate fingerprinting done right
Or at least done less wrong. A new paper in Climate Dynamics by University of Guelph professor Ross McKitrick called...
19 Nov, 2025| Science Notes

#HaveItBothWays: The Antarctic Peninsula
Last week we reported on new evidence that the Antarctic Peninsula (AP) has been experiencing significant cooling over the past...
12 Nov, 2025| Science Notes

Water Fern and extra CO2
From the CO2Science.org archive: Water Fern, or Azolla pinnata var. pinnata is widespread through Africa and South Asia and seems...
12 Nov, 2025| Science Notes

Antarctic Peninsula: Still cold
When tourists visit the Antarctic, and some actually do, they mostly visit the Antarctic Peninsula (AP), a thin projection of...
05 Nov, 2025| Science Notes

Elevated CO2 and fenugreek
From the CO2Science.org archive: Trigonella foenum-graecum or fenugreek, from the Latin faenugraecum or “Greek hay”, is used throughout the world...
05 Nov, 2025| Science Notes

Buckwheat and extra CO2
From the CO2Science archive: Fagopyrum esculentum or Common Buckwheat is a knotweed, though it is not a weed, nor for...
29 Oct, 2025| Science Notes

#HaveItBothWays: Rainfall in the Sahel
Today’s entry concerns the Sahel, a vast transition zone in Africa between the Sahara desert and the mid-continental rainforests. Senegal,...
22 Oct, 2025| Science Notes

Death to Death Valley record
On July 10, 1913, Death Valley, California, supposedly recorded a temperature of 134°F, which has long held the world record...
22 Oct, 2025| Science Notes

#HaveItBothWays: Plants going uphill
The logic is impeccable. Cold temperature limits plant growth so as temperatures rise, the upper line where plants including trees...
15 Oct, 2025| Science Notes

Greenland 1, models 0
A new study in Nature (h/t Wattsupwiththat) helps resolve a puzzle we didn’t even know exists because the people whose...
08 Oct, 2025| Science Notes

A bumper crop of bad science
Back in June we were treated to lurid headlines in CNN announcing that climate change would cut world crop production...
01 Oct, 2025| Science Notes

Aces low
As noted elsewhere this week, Matthew Wielicki has posted an update on the very quiet 2025 hurricane season in which...
24 Sep, 2025| Science Notes

The heatwave that time forgot
We recently recorded a rant about a new study in Nature magazine supposedly attributing hundreds of heatwaves to the emissions...
17 Sep, 2025| Science Notes

#HaveItBothWays: Indian rice yields
Here’s one that slipped through: a 2002 study of climate change and Indian rice yields found that the outlook was...
10 Sep, 2025| Science Notes

No see sea level acceleration
On our popular Sea Level Check series we took CDN readers on a round-the-world tour of coastal spots where long...
10 Sep, 2025| Science Notes

The effect of additional CO2 on Emblic
From the CO2Science archive: Also known as Phyllanthus emblica Gaertn, this tree in India bears a sour fruit that, according...
10 Sep, 2025| Science Notes

We know nothing, with great certainty
It’s a funny thing about climate models. They are essentially worthless at predicting, um, climate. And yet they remain extremely...
03 Sep, 2025| Science Notes

Of ice and surprises
We noted elsewhere this week news items expressing surprise at the lack of loss of Arctic sea ice. And there’s...
03 Sep, 2025| Science Notes

African oil palm and rising CO2
From the CO2Science Archive: Elaeis guineensis or African Oil Palm is a very important commercial plant native to Central and...
03 Sep, 2025| Science Notes

The effect of extra CO2 on Wallaby grass
From the CO2Science Archive: Wallaby grass, formally known as Rytidosperma richardsonii (Cashmore) but formerly formally known as Austrodanthia richardsonii (Cashmore)...
27 Aug, 2025| Science Notes

#HaveItBothWays: Earth's rotation
Do the days sometimes seem to drag on? It’s not your imagination, and it’s not just the result of getting...
20 Aug, 2025| Science Notes

People adapt to extreme heat
Of all the threats caused by climate change, one of the scariest or so we’re told is the soaring numbers...
20 Aug, 2025| Science Notes

#HaveItBothWays: Chinese locusts
In previous entries we told you that we, being nature lovers at heart, love nature including birds and forests. But...
30 Jul, 2025| Science Notes

Another sun god myth busted
Humans have created a long list of myths about the sun. Ancient civilizations from the Aztecs to the Zulus have...
30 Jul, 2025| Science Notes

Swollen Duckweed and CO2
From the CO2Science Archive: Unlike many plants in the archive, Lemna Gibba L. or Swollen Duckweed is not disparaged as...
30 Jul, 2025| Science Notes

#HaveItBothWays: boreal forests
Last week we told you we love birds. This week we want you to know we love forests. Really we...
23 Jul, 2025| Science Notes

Down with carbon
We frequently mock the idea that the world is in an energy transition and that big, industrialized countries are in...
23 Jul, 2025| Science Notes

Matthew Wielicki on CO2 isotopes
We recently reported on an important new study that raises interesting questions about where the extra carbon in the atmosphere...
16 Jul, 2025| Science Notes

#LookItUp: the hell that awaits us
To conclude our #LookItUp series we peer into the future. Do we have data about what life will be like...
09 Jul, 2025| Science Notes

Jet stream no wavier than before
As we often say, with climate change you can say anything. Warm winter? That’s due to climate change, see. Greenhouse...
09 Jul, 2025| Science Notes

The effect of additional CO2 on Bitter Dock
From the CO2Science.org archive: Rumex obtusifolius L. or Bitter Dock, also known as broad-leaved dock, bluntleaf dock, dock leaf, dockens...
09 Jul, 2025| Science Notes

#LookItUp: climate finance
This week’s entry in our #LookItUp series is partly directed at the you-skeptics-have-all-the-money accusation and partly also at the claim...
02 Jul, 2025| Science Notes

#LookItUp: US tornado counts
The US is home to “tornado alley”, an ominous name. Technically it refers to Texas, Oklahoma and Kansas but in...
25 Jun, 2025| Science Notes

It's extremely cold in Antarctica
We knew it was already of course, which is why we are not joining the rush to purchase seaside villas...
25 Jun, 2025| Science Notes

Ice, damned ice and statistics
Hat tip the Daily Sceptic we learn of a recent news item on Sky News in the UK that was...
11 Jun, 2025| Science Notes

Where have all the windstorms gone?
Roger Pielke Jr. points out that there have been no tropical cyclones anywhere in the Northern Hemisphere so far this...
04 Jun, 2025| Science Notes

#LookItUp: Indoor air pollution
When thinking about the sorts of data we need to have handy when explaining climate change issues to people, it’s...
28 May, 2025| Science Notes

Something's up with the clouds
Or down. Because global cloud cover has dropped over the past decade and, according to a recent study from researchers...
28 May, 2025| Science Notes

UHI in the US is HI(GH)
Dr. Roy Spencer just announced the publication of his new peer-reviewed paper on Urban Heat Island effects on U.S. summertime...
21 May, 2025| Science Notes

#LookItUp: Canadian weather data
We were reminded recently (h/t Parker Gallant) of a website we relied on six years ago for our Climate Emergency...
14 May, 2025| Science Notes

New and worse climate scenarios
By now you all know about RCP8.5, the spicy secret sauce in climate alarmist projections based on running an impossible...
07 May, 2025| Science Notes

Most major hurricanes evah!
Or at least back to 1970. And only considering hurricanes that made landfall. Roger Pielke Jr. and Ryan Maue have...
23 Apr, 2025| Science Notes

Orange man good for mandarin orange
Or something. Because from the CO2Science archive in 2006 there were two experiments on Citrus reticulata Blanco (Mandarin Orange Tree)...
23 Apr, 2025| Science Notes

#LookItUp: Canadian Arctic sea ice
We’ve already discussed Arctic sea ice volume in this series. But today we’re going to focus on the Canadian Arctic...
16 Apr, 2025| Science Notes

#LookItUp: Great Lakes water levels
In one of our earliest Fact Check videos we looked at the tragedy of the climate-driven drop in Great Lakes...
09 Apr, 2025| Science Notes

#LookItUp: NOAA sea level records
Over the years we have had some fun taking viewers around the world in our Sea Level Check series. Now...
02 Apr, 2025| Science Notes

#LookItUp: US tornadoes
The US is uniquely prone to tornadoes, and despite what the alarmists would have you believe, it has been since...
26 Mar, 2025| Science Notes

Not speaking moistly
An important detail in the global warming story is that when climate models are run far into the future, increasing...
26 Mar, 2025| Science Notes

#LookItUp: US drought severity
This week we go back to the NOAA Climate at a Glance website to see just how much worse droughts...
12 Mar, 2025| Science Notes

Money-fueled hurricanes
A team of American climate scientists led by Jessica Weinkle of the University of North Carolina has developed a novel...
12 Mar, 2025| Science Notes

#LookItUp: World energy consumption
There used to be an annual report from British Petroleum called the BP Statistical Review of World Energy. Then they...
05 Mar, 2025| Science Notes

#LookItUp: U.S. wildfires
Last week we showed you death and destruction from floods, drought, earthquakes and all manner of natural horrors. But since...
26 Feb, 2025| Science Notes

Where are the wildfires of yesteryear?
Forest fire scientists use the concept of a “fire deficit” to describe a situation in which, however many fires are...
26 Feb, 2025| Science Notes

Bright times in the EU
Over the past 40 years the amount of solar radiation at the land surface in the EU has gone up....
19 Feb, 2025| Science Notes

#LookItUp: Arctic sea ice volume
We are in an ice age, a geological epoch in which there is persistent year-round ice at the poles, and...
12 Feb, 2025| Science Notes

#LookItUp: Burned area by continent
Wildfires have been in the news lately. Indeed, since there are always wildfires burning somewhere in the world they always...
05 Feb, 2025| Science Notes

Greenland used to be green land
Turns out they weren’t lying: way underneath the centre of the Greenland ice sheet, as in 3 kilometers down, comes...
05 Feb, 2025| Science Notes

Cassava and CO2
From the CO2Science Archive: Cassava or Manihot esculenta Crantz is a hardy plant widely-grown in the tropics for its edible...
29 Jan, 2025| Science Notes

#LookItUp: US precipitation data
We have already pointed to the NOAA “Climate at a Glance” website for those data-involved individuals wanting to see the...
22 Jan, 2025| Science Notes

Brassica plants and CO2
From the CO2science archive: Percent Dry Weight (Biomass) Increases in Brassica oleracea L. for 300 and 600 ppm increases in...
15 Jan, 2025| Science Notes

Greenland is cool, man
And getting cooler. According to a new analysis by a group of Thailand-based scientists led by Nitinun Pongsiri of the...
18 Dec, 2024| Science Notes

Science notes in passing
We often have occasion to complain about the tendency of climate scientists to adjust historical surface thermometer data downwards, thus...
04 Dec, 2024| Science Notes

Science notes in passing
Not only does the IPCC not want to talk about global greening, their models get the role of plants in...
27 Nov, 2024| Science Notes

Green Blackout Part I: The SPMs
Earlier this year we reported on new evidence that global greening due to rising CO2 levels is not only continuing...
20 Nov, 2024| Science Notes

Science notes in passing
Anti-farming policies in Canada, the EU and elsewhere are justified by the supposed need to control agriculture-based nitrous oxide (N2O)...
20 Nov, 2024| Science Notes

#CheerfulCharts #15: Saved the whales
In this series we have shown many indicators of wonderful improvements in modern life, and while we can’t always point...
13 Nov, 2024| Science Notes

The incredible vanishing polar bears
Vanishing from the headlines, that is. Probably because in the real world they are doing just fine. Which came as...
13 Nov, 2024| Science Notes

#CheerfulCharts #14: Childhood cancers
We started this series because we knew there were some good news trends associated with modern life that people seemed...
06 Nov, 2024| Science Notes

CO2 sowing the wild oats
From the CO2Science Archive: Avena fatua L. or wild oat has managed to spread around the world and is considered...
06 Nov, 2024| Science Notes

An electrifying discrepancy
It’s hard to keep up with whatever the latest thing is in the wonderful world of alternative energy. Let’s see....
30 Oct, 2024| Science Notes

Oh nuts, more CO2
Specifically Arachis hypogaea L. or the humble peanut. In the CO2science archive we find that between 1993 and 2016 there...
30 Oct, 2024| Science Notes

Asparagus officinalis L. under extra CO2
From the CO2Science archive: Good old garden asparagus likes sunlight, well-drained slightly alkaline soil, good moisture and apparently extra CO2....
23 Oct, 2024| Science Notes

#CheerfulCharts #10: Moore's law
In 1965, engineer and Intel co-founder Gordon Moore sketched a few data points on a chart and offered a bold...
09 Oct, 2024| Science Notes

Hurricanes, then and now
“Then” in this case meaning over the interval from 850 to 2000. And it turns out there were hurricanes back...
09 Oct, 2024| Science Notes

Bell peppers and CO2
From the CO2Science archive: another fall veggie here in Ontario, the hardy if unglamorous Capsicum annuum L. or bell pepper,...
09 Oct, 2024| Science Notes

#Cheerfulcharts #9: Child labour
Lately the esteemed website OurWorldinData has been getting more and more obnoxious in their alarmist climate commentary. And while the...
02 Oct, 2024| Science Notes

(Nearly) coldest in 485 million years
There has been a lot of discussion lately about a new study which reconstructs global average temperatures over the past...
02 Oct, 2024| Science Notes

#CheerfulChart #8: Deforestation
We might never all agree on climate change. But we can probably all agree that trees are rather nice and...
25 Sep, 2024| Science Notes

AMOC still chugging along
The AMOC, aka the Atlantic Meridional Overturning Circulation, aka the Gulf Stream, aka the ocean currents carrying balmy winds from...
25 Sep, 2024| Science Notes

Scots pine under elevated CO2
From the CO2Science archive: Scots, or scotch, pine, formally called Pinus sylvestris L., was, like many settlers in Ontario, an...
25 Sep, 2024| Science Notes

More on clouds and climate
In 2021 we reported on a pair of studies (here and here) that analysed satellite-measured data and found that clouds...
18 Sep, 2024| Science Notes

Sunflowers and CO2
From the CO2Science archive: Percent Dry Weight (Biomass) Increases for Helianthus annuus [Sunflower]. It’s that time of year again (around...
18 Sep, 2024| Science Notes

The hurricane bust
Roger Pielke Jr. recently asked whether we are seeing a “hurricane forecast bust of historical proportions” because the modelers and...
11 Sep, 2024| Science Notes

Barley [hearts] CO2
From the CO2Science Archive: Percent Dry Weight (Biomass) Increases in Hordeum vulgare L. [Barley] for 300, 600 and 900 ppm...
11 Sep, 2024| Science Notes

#CheerfulCharts #5: Literacy
The key to being a climate doomster is to take for granted every aspect of human progress over the past...
04 Sep, 2024| Science Notes

Scientists discover talk is cheap
A detailed statistical analysis in a global scientific study undertaken by 258 (yes, it seems excessive) authors involving nearly 60,000...
21 Aug, 2024| Science Notes

#CheerfulCharts #1: Childhood mortality
Perhaps because so many people share the grim opinion of eccentric Canadian Green MP Elizabeth May that “baby boomers have...
24 Jul, 2024| Science Notes

Atmospheric CO2 concentrations: AD 800-2000
From the CO2Science archive: What was done The authors developed a well-dated high-resolution history of the atmosphere’s CO2 concentration spanning...
19 Jun, 2024| Science Notes

Hunga Tonga burnin' love
On January 15 2022 the Hunga Tonga-Hunga Ha’apai volcano, which we will shorten mercifully to HTHH or you can just...
12 Jun, 2024| Science Notes

ClimateMovie: the 2-minute version
To conclude our series on Martin Durkin’s Climate The Movie, we remind you that if you haven’t yet watched it...
05 Jun, 2024| Science Notes

Beefing up the climate alarm
With BBQ season soon upon us we offer CDN readers a word in defence of hamburgers, steaks, roasts, ribs, briskets...
05 Jun, 2024| Science Notes

Reducing methane emissions from cows
From the CO2Science archive: If one feels strongly about the (debatable) need to reduce greenhouse-gas emissions to the atmosphere, a...
05 Jun, 2024| Science Notes

#GettingWorse: Global wildfires edition
In advance of the Northern Hemisphere forest fire season let’s clear our throats and practice reciting the ominous headlines we...
15 May, 2024| Science Notes

#GettingWorse: Polar bears edition
Remember the polar bears? Those cute, cuddly, incredibly dangerous apex predator icons of the climate emergency that once roamed the...
08 May, 2024| Science Notes

ClimateMovie Fact Check: the Holocene
Continuing our Fact Check series on Martin Durkin’s new movie (which you should watch) we turn to the part where...
17 Apr, 2024| Science Notes

ClimateMovie fact check corner
If you haven’t seen Martin Durkin’s new documentary CLIMATE the MOVIE: The Cold Truth you should. There’s a lot of...
10 Apr, 2024| Science Notes

Overdue cooling?
From the CO2Science archive: Ruddiman et al. (2005) contended that “ice-core evidence from previous interglaciations indicates that forcing by orbital-scale...
10 Apr, 2024| Science Notes

The Holocene temperature conundrum
Our heading here is the title of a peer-reviewed paper published in 2014 by a group of scientists from around...
03 Apr, 2024| Science Notes

#GettingWorse: Droughts edition
With climate change getting worse each year, scientists are now warning that more and more regions around the world are...
27 Mar, 2024| Science Notes

A global energy transition reality check
The fabled green energy transition really is like the Yeti. Various climate alarmists rush about insisting they’ve not only glimpsed...
27 Mar, 2024| Science Notes

More warmth means a more stable climate
From the CO2Science Archive: Otoliths are aragonite (CaCO3) structures in fish that are used for acoustic perception and balance. When...
27 Mar, 2024| Science Notes

Yet another fake IPCC hockey stick
We were reminded recently of a discussion on Twitter/X nearly a year ago involving hockey stick slayer Steve McIntyre and...
13 Mar, 2024| Science Notes

Roy Spencer on models v observations
Dr. Roy Spencer of the University of Alabama, one of the developers of the celebrated technique for measuring atmospheric temperatures...
06 Mar, 2024| Science Notes

#Gettingworse: floods edition
A flood will occur somewhere around the world this year. And when it does we know what the experts will...
28 Feb, 2024| Science Notes

Antarctic ablation areas assessed
From the CO2Science Archive: We are forever hearing about the catastrophic consequences of unprecedented CO2-induced global warming, especially as it...
21 Feb, 2024| Science Notes

Assessing volcanic-induced climate forcing
From the CO2Science Archive: Statistical properties of climatically significant volcanic eruptions over the last 600 years were analyzed in an...
14 Feb, 2024| Science Notes

Green machine
As in planet Earth. As in put more CO2 in the air and watch it turn green. According to a...
07 Feb, 2024| Science Notes

The greening of sub-Saharan Africa
From the CO2Science Archive: According to Brandt et al. (2017), “little quantitative information is available about the state, rate and...
07 Feb, 2024| Science Notes

So about that polar vortex
Since scientific proof has nowadays ditched boring old-fashioned tools like physical theories and real-world data for computer models and colourful...
24 Jan, 2024| Science Notes

#ECS in the real world: Bates 2016
In this series on studies that estimate climate sensitivity based on observed climate data rather than climate models, we’ve noted...
10 Jan, 2024| Science Notes

A startling number of wildfires
On his Substack channel Roger Pielke Jr has presented a quick and useful summary of 2023 climate extremes. As he...
10 Jan, 2024| Science Notes

Lake Chala, and what was under it
H/t NoTricksZone we learn of a new paper in, of all places, Nature magazine, which shows that the mid-Holocene warm...
13 Dec, 2023| Science Notes

Where did all this ice come from?
H/t No Tricks Zone we have learned of a new study led by scientists from Kiel University in Germany that...
29 Nov, 2023| Science Notes

#ECS in the real world: Masters 2013
This week’s ECS estimate comes from UCLA scientist Troy Masters, who in 2013 published a paper in the peer-reviewed journal...
22 Nov, 2023| Science Notes

Models versus observations: AMOC edition
The Atlantic Meridional Overturning Circulation or AMOC, which we have mentioned previously including in our Pentagon Crystal Ball video, and...
15 Nov, 2023| Science Notes

North Atlantic deep water formation
From the CO2Science Archive: The authors write that “in response to global warming, most climate models predict a decline in...
15 Nov, 2023| Science Notes

#ECS in the real world: Otto et al. 2013
Otto in this case is Alexander Otto, a scientist at something called the “Environmental Change Institute” at Oxford University. And...
08 Nov, 2023| Science Notes

That's IFAR enough
“IFAR” isn’t a typo. It’s a tool used by climate scientists (or scientivists as they are sometimes called, merging “scientist”...
08 Nov, 2023| Science Notes

#ECS in the real world: Lewis 2013
Climate scientists have had to get used to outsiders wandering in from time to time to explain to them how...
01 Nov, 2023| Science Notes

A statistician recants
In 2015 the BBC ran a program called “Climate Change by the Numbers”, in which they picked three numbers they...
01 Nov, 2023| Science Notes

#ECS in the real world: Ring et al. 2012
In this new series we’re surveying past estimates of Equilibrium Climate Sensitivity (the crucial absolute amount of warming to be...
25 Oct, 2023| Science Notes

New series: #ECS in the real world
We’ve had plenty to say here at CDN about the elusive number known as Equilibrium Climate Sensitivity or ECS. If...
18 Oct, 2023| Science Notes

RIP Arctic sea ice
As in, rip-roaring, or at least coming back as it always does, and lately faster than expected. Ron Clutz’s Science...
18 Oct, 2023| Science Notes

Taking the sun seriously
A new paper by Italian climate scientist Nicola Scaffeta published in GeoScience Frontiers has reopened the whole discussion about the...
11 Oct, 2023| Science Notes

California summer: where did it go?
From the CO2Science archive: Concentrating on California, authors Schwing and Moore review a number of meteorological and oceanographic phenomena that...
13 Sep, 2023| Science Notes

Floods of the Namib Desert of Africa
From the CO2Science Archive: K. Heine notes that “droughts and floods represent extreme conditions, and are precisely those that are...
06 Sep, 2023| Science Notes

On the origin of extreme climatic events
From the CO2Science archive: The authors write that “over the tropical latitudes, it is certainly true that extremes in climate...
23 Aug, 2023| Science Notes

Semi-apology from CDN
CDN would like to apologize to our faithful readers for unwittingly spreading climate misinformation and disinformation in our July 19...
02 Aug, 2023| Science Notes

ECS over the Phanerozoic
You might have noticed that all the cool people are using CDN mugs like the one showing half a billion...
12 Jul, 2023| Science Notes

Climate models: A glimpse under the hood
Or behind the curtain, or wherever they’re telling you not to look because it’s messy or distracting. But Willis Eschenbach,...
05 Jul, 2023| Science Notes

The Doomsday Glacier that wasn't
Here comes the Thwaites Glacier again. Or goes. CDN readers know that every time alarmist activists and climate journalists (but...
07 Jun, 2023| Science Notes

NOAA's STAR has fallen
Among the buzzing host of climate acronyms here are three you should definitely focus on: UAH, RSS and STAR. Oh,...
19 Apr, 2023| Science Notes

#CoolClimateData: Rutgers Snow Lab
It just doesn’t snow like it used to, right? Well, yes and no. More like, it just doesn’t snow when...
05 Apr, 2023| Science Notes

#CoolClimateData: CHRS Rainsphere
This week we start a new series devoted to showing readers where to find interesting and useful climate data sources...
22 Mar, 2023| Science Notes

To the brink of extinction... and back
From the CO2Science Archive: Gilmour et al. write that “coral reef recovery from major disturbance is hypothesized to depend on...
22 Mar, 2023| Science Notes

Al Gore rides the waves in Davos
Wrapping up our fact check of Al Gore’s rant in Davos, we now turn to his claim that global warming...
15 Mar, 2023| Science Notes

Mercury stalled in Greenland
Courtesy of Kenneth Richard of No Tricks Zone we learn of a new study in the Journal of Climate measuring...
15 Mar, 2023| Science Notes

Al Gore melts down in Davos
Next up in our Fact Check of Al Gore’s rant in Davos we get to his claim that carbon dioxide...
08 Mar, 2023| Science Notes

Land use change and the climate
Over at Roger Pielke Jr’s Substack channel his father, Roger Pielke Sr, a highly accomplished atmospheric scientist, has written an...
08 Mar, 2023| Science Notes

Al Gore gets dried up in Davos
We continue our fact check of Al Gore’s rant in Davos, turning now to his claim that CO2 is “sucking...
01 Mar, 2023| Science Notes

The virtual water content of Chinese crops
From the CO2Science Archive: Noting that “looming water scarcity and climate change pose big challenges for China’s food security,” the...
01 Mar, 2023| Science Notes

Al Gore bombs in Davos
Continuing our fact check of Al Gore’s rant in Davos we come to his claim that CO2 emissions are causing...
22 Feb, 2023| Science Notes

Roger Pielke Jr. unspins tornadoes
In his Substack series called “What the media won’t tell you about...”, Roger Pielke Jr. turns his attention to the...
22 Feb, 2023| Science Notes

Al Gore boils over in Davos
Note:  this post has been edited to correct an earlier version. Continuing with our fact check on Al Gore’s epic...
08 Feb, 2023| Science Notes

Al Gore goes nuclear in Davos
It might seem like a fool’s errand to fact check Al Gore. But the man does have a big audience...
01 Feb, 2023| Science Notes

Biofuels: going from useless to harmful
From the CO2Science archive: Enough serious work has been conducted on the growing, harvesting and processing of the raw materials...
01 Feb, 2023| Science Notes

Peruvian sea levels: IPCC vs the ocean
A new study by an international team of scientists (h/t No Tricks Zone) gathered detailed daily sea level measurements at...
25 Jan, 2023| Science Notes

Time for an eye exam
Or at least an Iris exam. The “Iris Effect” was proposed in 2001 by MIT Atmospheric Scientist Richard Lindzen as...
25 Jan, 2023| Science Notes

Winters may be about to get colder
New in the journal Nature-Climate and Atmospheric Science is a study (h/t Fritz Vahrenholt and NoTricksZone) making a projection we...
18 Jan, 2023| Science Notes

Climate crisis in California
We begin 2023 relieved that the unprecedented Southern California flooding of ’22 is now behind us. Witnesses say the flooding...
11 Jan, 2023| Science Notes

UN-hyping global climate disasters in 2022
“Combating misinformation” is all the rage these days, at least among government officials who want ever-expanding censorship powers to deal...
11 Jan, 2023| Science Notes

Hurricane data at your fingertips
Call us nerds, or geeks and dorks. But we love nothing more than discovering a new online data source. Here,...
14 Dec, 2022| Science Notes

RPC8.5: still a scam
CDN readers are familiar with the RCP8.5 cheat in which climate modelers use a grossly exaggerated emission scenario to project...
07 Dec, 2022| Science Notes

Hot American models
Or more precisely, climate models run too hot when simulating US surface temperatures. This was the conclusion of climatologist Roy...
23 Nov, 2022| Science Notes

IPCC Trends Atlas: Egypt Edition
From November 6 to 18 all the great and good (except King Charles) will meet for COP27 in Sharm el-Sheikh...
09 Nov, 2022| Science Notes

Interview with climatologist Bjorn Stevens
Over at Judith Curry’s website Nic Lewis has posted an English translation of an interview with prominent German climatologist Bjorn...
02 Nov, 2022| Science Notes

Setting it straight on hurricanes
Not surprisingly, people continue to insist that hurricane Fiona hitting the Maritimes or Hurricane Ian hitting Florida is proof of,...
12 Oct, 2022| Science Notes

Coastal storms of the North Atlantic Basin
From the CO2Science Archive: What was done: The authors assess the “temporal variability of coastal storms (both tropical and extratropical)...
12 Oct, 2022| Science Notes

The IPCC botched the math, E-C-E-C-S
As our March 2020 video on the Climate Sensitivity Question explains, a key issue in climate science is how much...
28 Sep, 2022| Science Notes

IPCC Atlas on severe wind storms
We recently reported on the IPCC’s new map-based Atlas showing compilations of research on historical trends in all manner of...
21 Sep, 2022| Science Notes

The IPCC atlas on drought in Europe
Little-noticed in last year’s release of the IPCC 6th Assessment Report was an online Atlas which provides a quick overview...
07 Sep, 2022| Science Notes

Where are the typhoons of yesteryear?
In 2013 typhoon Haiyan hit the Philippines, a tragedy that killed thousands of people. It coincided with the opening of...
24 Aug, 2022| Science Notes

New CDN Feature: Everybody Knows
We’re starting a new feature here at CDN where we take on some common truisms about global warming that everybody...
17 Aug, 2022| Science Notes

CDN by the Sea: Marseille, France
After last week’s frozen trek to Antarctica, we decided to treat ourselves to the sunny south of France, especially since...
27 Jul, 2022| Science Notes

Global burn area declining since 2013
Another unshakeable belief among climate alarmists is that wildfires are increasing around the world due to climate change. We already...
29 Jun, 2022| Science Notes

CDN by the Sea: Gibara, Cuba
Hurricane season is approaching, so residents of the Caribbean need to take all the usual precautions in case a big...
29 Jun, 2022| Science Notes

Hot town, summer in the city
It’s that time of year again, at least here in the Northern Hemisphere. With a nod to our many readers...
22 Jun, 2022| Science Notes

CDN by the Sea: Adak, Alaska
The westernmost municipality in Alaska is so far west it’s almost in Russia. It would be in tomorrow if not...
22 Jun, 2022| Science Notes

Running AMOC with the climate
If you watched our video on The Pentagon’s Cracked Crystal Ball (and if you haven’t, great fun awaits you) you’ll...
15 Jun, 2022| Science Notes

CDN by the Sea: Bergen, Norway
It recently occurred to us that we have been using sea levels data collected in Liverpool UK on our virtual...
15 Jun, 2022| Science Notes

Pielke Jr. on hurricanes
At the risk of boring CDN readers, who know all these things already, we bring you the latest essay by...
08 Jun, 2022| Science Notes

CDN by the sea: Kigiliah, Russia
We’re not sure if the sanctions on Russia mean we’re not supposed to use any data from them. But Kigiliah...
08 Jun, 2022| Science Notes

Don't count on EVs to cut GHGs
Electric Vehicles (EVs) will speed us down the path to Net Zero, right? Except that making the EV generates emissions,...
01 Jun, 2022| Science Notes

CDN by the Sea: Tromso Norway
We haven’t had much luck finding rising sea levels down in the south thus far on our virtual tour. So...
01 Jun, 2022| Science Notes

CDN by the Sea: Talcahuano Chile
Like stout Cortez and his men we stare at the Pacific with eagle eyes, and then look upon each other...
25 May, 2022| Science Notes

CDN by the Sea: Siros Greece
If you have ever dreamed of just chucking it all in and going to live on a Greek Island far...
18 May, 2022| Science Notes

CDN by the Sea, Adelaide Australia
Our round-the-world tour of seaside locations takes us this week to Adelaide, Australia, where the news would have you believe...
11 May, 2022| Science Notes

CDN by the sea: Singapore
The city-state of Singapore is perched on the southern tip of Malaysia, where they gaze in horror at the rising...
04 May, 2022| Science Notes

When Iceland had no ice
It wasn’t all that long ago, in geological terms. According to a recent study in Quaternary Science Reviews (h/t No...
04 May, 2022| Science Notes

CDN by the sea: Juneau Alaska
We are obliged by the proposed new Canadian laws against spreading climate disinformation on the internet to tell you that...
20 Apr, 2022| Science Notes

Lies, d**n lies and rainfall data
There’s an unwritten rule in climate change reporting that you can point to any bad weather and claim it’s getting...
20 Apr, 2022| Science Notes

CDN by the sea: Victoria BC
Our second stop on the CDN tour of seaside destinations in search of rising sea levels takes us to the...
13 Apr, 2022| Science Notes

CDN by the sea: Monterey California
With winter stretching into its sixth month here in Ontario, CDN needs a holiday. And where better than by the...
06 Apr, 2022| Science Notes

Yes, that sun
There was a time in decades past when people assumed the sun played a leading role in climate change. After...
09 Feb, 2022| Science Notes

The song of Song (and Tang)
The Song and Tang dynasties in China spanned over six centuries beginning in 618 AD. It was an especially prolific...
02 Feb, 2022| Science Notes

Warming caused the Little Ice Age
So far climate scientists haven’t abolished the Little Ice Age. Instead they sort of agree it happened, though many insist...
26 Jan, 2022| Science Notes

IPCC AR6: Streamflow, Unspun Edition
We previously brought you some of the IPCC’s latest on run-off and flooding, and we continue with their discussion of...
12 Jan, 2022| Science Notes

1920 or 2020? Cape Otway Edition
Last week we took you to a lighthouse on the southern coast of Australia, and the view was so pleasant...
22 Dec, 2021| 1920 or 2020

Tornado roundup
There has understandably been a lot of attention paid to the devastating tornadoes that hit the US northeast over the...
22 Dec, 2021| Science Notes

1920 or 2020? Kerang Australia Edition
The town of Kerang is midway between Adelaide and Canberra in Victoria, Australia, so if you find yourself driving through...
24 Nov, 2021| 1920 or 2020

Seas rise and shores expand
You read that right. Even though alarmists like to torment schoolchildren and gullible grownups with pictures of land being submerged...
24 Nov, 2021| Science Notes

About that big Greenland melt
So Antarctica isn’t melting. But what about the other big, though smaller, land-based ice mass at the other end of...
17 Nov, 2021| Science Notes

Back to 1920 or 2020?
The little town of Donnybrook boasts the largest free-entry playground in Australia, the Apple Fun Park. And in addition to...
10 Nov, 2021| 1920 or 2020

Back to IPCC AR6
We keep forgetting whether climate change is bad because it is bringing more rain or less rain. Or both, sometimes...
10 Nov, 2021| Science Notes

Back to droughts
From CO2Science: To provide a long-term perspective on the nature of recent droughts occurring on Vancouver Island, in the words...
10 Nov, 2021| Science Notes

The madness of clouds (II)
Last week we discussed a new study exploring the puzzle that over the past two decades the sun didn’t get...
03 Nov, 2021| Science Notes

The madness of clouds (I)
Via NoTricksZone we learn of a new study showing that over the past 20 years the largest influence on climate...
27 Oct, 2021| Science Notes

Weatherbell winter outlook
It’s been a mild fall in Ontario and much of North America generally. And some folks who get to brag...
20 Oct, 2021| Science Notes

A timely reminder that cold kills
Via NoTricksZone we learn of a new study in The Lancet that confirms what many other authors have found: Cold...
20 Oct, 2021| Science Notes

The melting Greenland ice cap
Journalists regularly seize on random local warm weather or rain events on Greenland as proof of unprecedented warming and the...
22 Sep, 2021| Science Notes

IPCC AR6: Tropical cyclones, unspun edition
Most attention in popular climate discussions is focused on extreme weather, especially hurricanes, tornadoes and heavy rainstorms. So we turn...
15 Sep, 2021| Science Notes

The settled science of fingerprinting
We mentioned last week a new paper by University of Guelph professor Ross McKitrick arguing that the way IPCC scientists...
25 Aug, 2021| Science Notes

Hide the Decline: 2021 IPCC Edition
Viewers of our video on the IPCC “Hide the Decline” debacle will know that in 2001 the IPCC dealt with...
18 Aug, 2021| Science Notes

A serious downside to reducing CO2 emissions
From CO2Science: Climate alarmists have ramped up their efforts calling for the total elimination of all fossil-derived energy, claiming there...
14 Jul, 2021| Science Notes

If diatoms could talk
The oceans would be very noisy since these little single-celled algae organisms make up nearly half the living matter in...
07 Jul, 2021| Science Notes

Aerosols on ice Part II
We told you last week about a remarkable study in which climate scientists led by Pengfei Liu of Harvard dug...
23 Jun, 2021| Science Notes

Aerosols on ice Part I
A new study just out in Science Advances provides a novel reconstruction of Southern Hemisphere air pollution from 1750 to...
16 Jun, 2021| Science Notes

Dare you to post it on Facebook
A CDN reader reports (see comment here) that he tried to post an excerpt from the IPCC regarding drought frequency...
09 Jun, 2021| Science Notes

Dare you to post it on Facebook
This week’s provocation concerns trees. Specifically the forests that are going to be wiped out by climate change. Except they’re...
02 Jun, 2021| Science Notes

Dare you to post it on Facebook
Once again we offer you what sounds like denialist sloganeering but which turns out to be a paraphrase of past...
26 May, 2021| Science Notes

Dare you to post it on Facebook
As before we offer you a paraphrase of recent IPCC conclusions on some aspect of climate change so counter to...
19 May, 2021| Science Notes

Dare you to post it on Facebook
In this feature we give you some inane sounding, anti-science denialist propaganda which the ever-vigilant Facebook fact-checkers can pounce on...
12 May, 2021| Science Notes

Dare you to post it on Facebook
In this feature we offer you some outrageous denier propaganda that you can post on your Facebook page in the...
05 May, 2021| Science Notes

Dare you to post it on Facebook
We’ve noticed that in recent years the alarmist rhetoric of activists and journalists has become so scary that past reports...
28 Apr, 2021| Science Notes

Dare you to post it on Facebook
As we reported in our April 14 newsletter, Facebook is setting up a large fact-checking unit to “combat misinformation” about...
21 Apr, 2021| Science Notes

Scientists say
Some scientists in the past have said that during the Phanerozoic Eon, which spans the last 541 million years, CO2...
14 Apr, 2021| Science Notes

Scientists say
... that wildfire is a bigger and deadlier threat than ever before: “today’s fires tend to be larger and more...
07 Apr, 2021| Science Notes

Scientists say
... that northern Ontario was about 2 degrees C warmer than today for a stretch of about three thousand years...
31 Mar, 2021| Science Notes

Scientists say
“[There] is overwhelming evidence that the planet has warmed during the past century. But could this warming be due to...
24 Mar, 2021| Science Notes

Scientists say
...that everyone who thinks Net Zero not only will be easy but painless and wildly profitable is peddling moonshine. Here’s...
17 Mar, 2021| Science Notes

Scientists say
All together now: climate change means more extreme rainfall. “It is likely that there have been statistically significant increases in...
10 Mar, 2021| Science Notes

Scientists say
... that climate science is settled and everything is your fault. Well that’s what some of them say. Others keep...
03 Mar, 2021| Science Notes

Scientists say...
That climate models are accurate and can predict the future. No, wait. That’s what journalists and politicians say scientists say....
24 Feb, 2021| Science Notes

Scientists say (8)
Hottest year ever!! scientists say. Well yes, some do, though as we’ve explained, we don’t think claiming to be able...
17 Feb, 2021| Science Notes

Scientists say (7)
No doubt you’ve heard or read a sentence like “other island nations like Tuvalu, Kiribati and the Marshall Islands could...
10 Feb, 2021| Science Notes

Scientists say (6)
Herewith our latest installment of stuff that actual scientists actually say, as opposed to stuff journalists make up then adorn...
03 Feb, 2021| Science Notes

Scientists say (5)
In this feature, rather than adding “scientists say” to scary slogans to make them sound authoritative, we skip the slogans...
27 Jan, 2021| Science Notes

Scientists say (4)
Activists in the media use “scientists say” to lend a gloss of respectability to whatever alarmist slogan they write. And...
20 Jan, 2021| Science Notes

Scientists say (3)
Once again we turn the alarmists’ trick of uttering warnings about the alleged climate disaster then, in lieu of actual...
13 Jan, 2021| Science Notes

Scientists who say (2)
Given journalists’ habit of tossing out alarmist slogans then adding “scientists say” to the end of the sentence to make...
06 Jan, 2021| Science Notes

Scientists who say (1)
We frequently refer sarcastically to the journalistic phrase “scientists say”, which is often appended to the end of a sentence...
16 Dec, 2020| Science Notes

A solar-climate link in arid central Asia
From Co2Science: In the words of Huang et al. (2020), “millennial- and centennial-scale climate observations over the entire Holocene in...
02 Dec, 2020| Science Notes

Not much ice in the Great Basin
We have previously reported on a series of studies showing that the Arctic warmed after the end of the last...
25 Nov, 2020| Science Notes

There's a lot of ice in the Arctic
Charts going back to the 1980s show a reduction in summertime sea ice extent in the Arctic. It’s one of...
04 Nov, 2020| Science Notes

Impacts of CO2 on two grapevine cultivars
From CO2Science: Despite insurmountable evidence that rising levels of atmospheric CO2 enhance plant growth, boost water use efficiency and help...
28 Oct, 2020| Science Notes

It's awfully cold in East Antarctica
If that observation strikes you as not exactly fitting in the category of breaking news, we don’t just mean in...
21 Oct, 2020| Science Notes

Dangerous sea-level rise
A new review by Kenneth Richard of No Tricks Zone shows highlights of four studies published this year on changes...
14 Oct, 2020| Science Notes

Where did everybody go?
One of the underpinnings of 21st century climate forecasts is the projected growth of population. More people means more carbon...
30 Sep, 2020| Science Notes

The man-made forest fire problem
“The idea that fire is somehow new,” said geographer Paul Robbins of the University of Wisconsin, “a product solely of...
23 Sep, 2020| Science Notes

Man-made warming in China
From CO2Science: Significant urban heat islands have been observed in many cities. To date, much research has revealed urban heat...
23 Sep, 2020| Science Notes

And a special prize for the Canadian model
Two new papers by independent teams have been published in peer-reviewed journals showing that the latest generation of climate models...
02 Sep, 2020| Science Notes

A century of drought in East Africa
From CO2Science: Droughts are a normal feature of climate capable of causing some of the most devastating natural disasters. And...
02 Sep, 2020| Science Notes

Gulf of Mexico coastal hurricane strikes
With Hurricane Laura making landfall and the alarmist crowd predictably blaming it on the current US President as if hurricanes...
02 Sep, 2020| Science Notes

The madness of clouds
We have talked previously about the extreme difficulties of modelling clouds, and why it is a problem for the science-is-settled...
26 Aug, 2020| Science Notes

1919 or 2019? Back to Ottawa
We end up where we began our quiz series, in Ottawa, looking this time at precipitation in Canada’s capital, where...
15 Jul, 2020| 1919 or 2019

Warming means fewer hurricanes
Every time a hurricane strikes the US, which has happened less frequently this decade than most previous decades, the alarmists...
15 Jul, 2020| Science Notes

1919 or 2019? Vancouver Edition
The mountains around Vancouver are beautiful to behold. But they also capture the moist winds off the Pacific and create...
08 Jul, 2020| 1919 or 2019

Waak waak waak
Penguins can’t seem to get a break. And they’re funny-looking. Admit it. Graceful under water, yes. But funny on land....
08 Jul, 2020| Science Notes

1919 or 2019? London Ontario Edition
London Ontario, down there in tornado alley, is accustomed to the vagaries of weather and the ability of an ordinary...
01 Jul, 2020| 1919 or 2019

When the land really was green
Via Kenneth Richard of NoTricksZone we learn of a fascinating study from 2016 that measured how much sunlight hit the...
01 Jul, 2020| Science Notes

If your only tool is a CO2 molecule...
A new paper in The European Physical Journal by veteran MIT meteorologist Richard Lindzen gently but clearly ridicules the idea...
24 Jun, 2020| Science Notes

The beaches of Rio
Kenneth Richard of NoTricksZone alerts us to a new paper reviewing evidence on sea levels in Sepetiba Bay, just south...
24 Jun, 2020| Science Notes

1919 or 2019? Kingston Edition
For today’s contest we wander amidst the leafy splendour of Queen’s University in Kingston Ontario to compare rainfall records from...
17 Jun, 2020| 1919 or 2019

1919 or 2019? Victoria BC Edition
Since we're looking at rainfall, we should go somewhere they get enough of the stuff to know when it's changing....
10 Jun, 2020| 1919 or 2019

Sensitivity a la carte
We've talked about the problem of estimating Equilibrium Climate Sensitivity (ECS) before. We even made a video we invite you...
10 Jun, 2020| Science Notes

Time to give up the fantasy
Speaking of climate sensitivity, a correspondent alerted us to an amusing exchange a few years back in a climate journal...
10 Jun, 2020| Science Notes

Just in time for hurricane season
Via CO2Science we learn of a new study of hurricane frequency and intensity near Charleston South Carolina spanning 1670 to...
03 Jun, 2020| Science Notes

1919 or 2019? Back to Ranfurly
We’ve seen enough temperature profiles from cities across the country to underline the truth of a point we have made...
27 May, 2020| 1919 or 2019

1919 or 2019? Nicolet Edition
Bienvenue à Nicolet! Nestled midway between Montreal and Quebec City on the St. Lawrence south shore, this quaint town at...
20 May, 2020| 1919 or 2019

The iron law of modeling
At a time when COVID-19 models are being lambasted for vastly overstating the mortality rates from SARS-CoV-2, we begin to...
20 May, 2020| Science Notes

1919 or 2019? Ranfurly Edition
Yes, there is a place in Canada with the lovely name of Ranfurly. It’s in Alberta just east of Lavoy...
13 May, 2020| 1919 or 2019

Getting Medieval on China's Temperature
Via the Global Warming Policy Forum we learn of a new study compiling temperature proxies and historical records for China...
13 May, 2020| Science Notes

Bad news if you hate vegetables
If climate change wasn’t already scary enough, a new comprehensive meta-analysis of over 100 studies published over nearly 60 years...
13 May, 2020| Science Notes

1919 or 2019? Atlin BC
One difficulty with surface thermometer data is that the longest records tend to be located where people live, so they...
06 May, 2020| 1919 or 2019

A fiery blast from the past
We have previously noted that the climate models currently in use are too sensitive, meaning on average they predict too...
06 May, 2020| Science Notes

1919 or 2019? St. John's Edition
If you had planned your summer holidays out on The Rock, or maybe down on Broadway to take in Come...
29 Apr, 2020| 1919 or 2019

Dry scientific findings
We’ve had a lot to say about droughts here at CDN, partly because of all the scary pictures people like...
29 Apr, 2020| Science Notes

1919 or 2019? Welland Ontario Edition
With the coronavirus hitting our food supply chain, we’re all glancing nervously towards the farming districts and hoping they’ll be...
22 Apr, 2020| 1919 or 2019

The ice that wouldn't melt
Susan Crockford of Polar Bear Science notes that the ice around Svalbard island is at its highest level since 1988...
22 Apr, 2020| Science Notes

The 'Hydro-illogical cycle'
Alas, we cannot take credit for that title, which was coined by hydrologists a long time ago to describe the...
15 Apr, 2020| Science Notes

Hottest Year Ever, Medieval Edition
Alarmists like to rattle off “hottest years ever” lists, which inevitably make it sound like the last few years are...
15 Apr, 2020| Science Notes

1919 or 2019 Wind Turbine Edition
Today’s contest is from London Ontario, down in the southwest part of the province where the previous provincial government put...
08 Apr, 2020| 1919 or 2019

Come elasticity or high water
We have previously discussed why we don’t think global warming is behind urban flooding. But even if it is, and...
08 Apr, 2020| Science Notes

Corals on acid
Ocean acidification is one of terms that invites you to picture an apocalyptic horror show, with the ocean turning into...
08 Apr, 2020| Science Notes

Fredericton: 1919 or 2019?
This time we head out to picturesque, friendly Fredericton NB, sizzling by the St. John River and struggling mightily to...
01 Apr, 2020| 1919 or 2019

1919 or 2019? Banff Edition
Ah Banff, the quintessential Canadian holiday spot, which in days of yore could be counted on for picture perfect winter...
25 Mar, 2020| 1919 or 2019

Or your coral gets it
Among the 1950s-drive-in-horror-style warnings routine on the topic of climate, we’re told corals are as fragile as they are beautiful...
25 Mar, 2020| Science Notes

An average year in Brazil's Amazon
Remember how the planet's lungs were on fire last year and the wildfires in the Brazilian Amazon were a crisis...
25 Mar, 2020| Science Notes

1919 or 2019 on the Prairies
If there’s one place that should have welcomed a bit of global warming, it’s Winnipeg Manitoba. Where they’ve been faithfully...
18 Mar, 2020| 1919 or 2019

Snow cover, more or less
We have previously reported that Northern Hemisphere winters have been getting snowier since 1990 according to the Rutgers University Global...
18 Mar, 2020| Science Notes

1919 or 2019?
Governments, media and activists keep insisting the weather today is completely different than it used to be and it’s all...
11 Mar, 2020| 1919 or 2019

CO2 doubling and beyond
Suppose in a wild worst-case scenario, instead of just doubling atmospheric CO2 over pre-industrial times, we somehow doubled it again...
11 Mar, 2020| Science Notes

Sweltering in Siberia
January was supposedly the hottest January ever and we’re all going to die according to reputable American governmental science agencies...
04 Mar, 2020| Science Notes

Why are polar bears going extinct?
It’s apparently such a common Google query that if you search “Polar bears” it’s the first “People also ask” option....
04 Mar, 2020| Science Notes

Sins of emission part 2
We reported last week on efforts by whistle-blowers in the climate science community to get their colleagues to stop using...
26 Feb, 2020| Science Notes

Cooling is good but not necessarily
Climatologists tell us that the stuff we put into the air has both warming and cooling effects. Greenhouse gases cause...
26 Feb, 2020| Science Notes

Models overstate Arctic warming
A new study in the peer-reviewed journal Geophysical Research Letters says... well, let’s let the authors do the talking. They...
26 Feb, 2020| Science Notes

Snowier everywhere but in the models
We recently noted that Northern Hemisphere records show the fall and winter seasons have been getting snowier on average even...
19 Feb, 2020| Science Notes

Alarmists busted
A controversy erupted in the world of climate modeling last month when two scientists published a commentary in Nature magazine...
12 Feb, 2020| Science Notes

Droughts: Just the facts
There's a standard litany about the evil effects of greenhouse gases that usually starts with “droughts, floods, hurricanes” and whatever...
12 Feb, 2020| Science Notes

But we were only off by a factor of 10
In 2018, with Hurricane Florence bearing down on the Carolinas, a group of scientists cranked up their supercomputer and announced...
12 Feb, 2020| Science Notes

Why didn't Tilligerry burn?
As the Australian bush fires die down, alarmists continue to blame climate change, a.k.a. you and your car. In our...
05 Feb, 2020| Science Notes

The snows of yesteryear
Your memory is not playing tricks. Winters are not what they used to be. See, it now… snows more. At...
05 Feb, 2020| Science Notes

Hot peppers
Scientists have spent the last several decades running experiments that expose crops to elevated carbon dioxide levels to see how...
29 Jan, 2020| Science Notes

Uh-oh, we just had the best decade ever
As the Spectator explains, the world has just experienced the best decade ever. It had its horrors, personal and geopolitical....
22 Jan, 2020| Science Notes

Sensitivity training for climate models
Scientists call the big question at the heart of the global warming “Equilibrium Climate Sensitivity”, or ECS. In English, it’s...
22 Jan, 2020| Science Notes

Fishy story
It's easy to despair about hyper-politicized climate science. But cheer up. Marine scientists at James Cook University in Australia have...
15 Jan, 2020| Science Notes

Safer from climate disaster than ever
A paper published in the scientific literature in July 2019 had the refreshingly plain-language title “Empirical evidence of declining global...
08 Jan, 2020| Science Notes

A much warmer Arctic
Don't tell Greta. But in the Scandinavian part of the Arctic around Svalbard Island, about ten thousand years ago, summers...
18 Dec, 2019| Science Notes

There goes the sun
According to Perspecta, Inc. meteorologist Paul Dorian on Watt’s Up With That?, the sun is going veeery quiet indeed. In...
18 Dec, 2019| Science Notes

A prediction that came true
In 1994 American meteorologists John Christy and Richard McNider took the 15 years of satellite data then available and measured...
11 Dec, 2019| Science Notes

Energy reality by the numbers
Like many Canadian energy executives, Chris Slubicki of Modern Resources is an engineer by training. When he kept hearing that...
11 Dec, 2019| Science Notes

In the Arctic, warming means cooling
We've been told a million times that global warming means extra turbocharged "amplified" warming in the Arctic, with dying polar...
04 Dec, 2019| Science Notes

Dead woman tells a tale
An intriguing new paper in the Journal of Marine Biology and Aquascape challenges conventional wisdom based on photographic and archaeological...
04 Dec, 2019| Science Notes

The very small crisis
We often hear that anthropogenic climate change is an emergency, and that greenhouse gases are the main drivers of everything...
27 Nov, 2019| Science Notes

Cherries in the rain
Global warming isn’t making it rain harder in the United States. Or less. Or both. So says a recent paper...
27 Nov, 2019| Science Notes

Some pictures of hot models
We're not given to using clickbait to attract subscribers. But here the models in question have temperature curves because they’re...
20 Nov, 2019| Science Notes

Whale the saves
The fundamental unseriousness of discussions of climate change is revealed by a story saying “whales may be able to store...
20 Nov, 2019| Science Notes

Climate Emergency Tour: Toronto Edition
The City of Toronto has embraced the climate emergency movement with great gusto, even floating the idea of new property...
13 Nov, 2019| Climate Emergency Tour

Green acres are getting greener
It's been known for years that adding CO2 to the air improves plant growth, which is not surprising since CO2...
06 Nov, 2019| Science Notes

Climate Emergency Tour: Markham Edition
A correspondent alerted us to an upcoming effort to get Markham to declare a climate emergency. It apparently not being...
06 Nov, 2019| Climate Emergency Tour

Warming isn't making hurricanes worse
Also from Pat Michaels is an op ed on the supposed link between Atlantic hurricanes and global warming. Michaels is...
30 Oct, 2019| Science Notes

Clouds ain't so cool
Some climate models say greenhouse gases cause a lot of warming and others don’t. Yet they all fit 20th century...
23 Oct, 2019| Science Notes

Warming means a greener Sahara
Global warming means the Sahara will expand, right? And that makes it a crisis, right? Wrong on both counts, says...
23 Oct, 2019| Science Notes

Don't tell Greta
Greta Thunberg thinks warm weather is a crisis. And since she’s easily upset it’s a good thing she doesn't realize...
16 Oct, 2019| Science Notes

Meanwhile in China
Via the Global Warming Policy Foundation we learn that researchers with the Chinese Academy of Sciences have analysed organic material...
16 Oct, 2019| Science Notes

Confessions of a climate scientist
Nakamura Mototaka, a Ph.D. in climatology from MIT, has worked at NASA, the Georgia Institute of Technology, Duke University and...
09 Oct, 2019| Science Notes

Cold kills yet again
The medical journal The Lancet recently published one of the largest studies ever undertaken of weather-related mortality risk. Analysis of...
09 Oct, 2019| Science Notes

Nothing to sea here
Just in time for the IPCC's special report on warming oceans and melting ice comes news that Nature magazine has...
02 Oct, 2019| Science Notes

Caution: Logic approaching
Judith Curry is a tropical meteorologist, retired chair of Earth Sciences at Georgia Tech and now head of a private...
25 Sep, 2019| Science Notes

Climate Emergency Tour: Winnipeg Edition
Alas, poor Winterpeg. Sitting there year after year waiting for a bit of lovely climate emergency to make the winters...
25 Sep, 2019| Climate Emergency Tour

Because Greenland really needs more ice
“SPECIAL REPORT: As their home melts, Greenlanders confront the fallout of climate change” shrieks NBC in a Sept. 17 email...
25 Sep, 2019| Science Notes

Cold winters and melting Arctic ice
Lately we've had brutally cold winters. Like in Sudbury, subject of this week's Climate Emergency whistle stop. And we are...
18 Sep, 2019| Science Notes

Aaaack, more winter rain
A new study taps a previously unused source of data and comes up with a definite trend in climate change:...
18 Sep, 2019| Science Notes

Climate Emergency Tour: Edmonton Edition
If you listen to its city councillors, Edmonton is facing a Climate Emergency. We prefer looking at the climate data,...
11 Sep, 2019| Climate Emergency Tour

Newsflash: Coastal areas are wet
With climate alarmism hopping from panic to panic like a polar bear on a melting ice floe, it’s useful periodically...
11 Sep, 2019| Science Notes

There's a carbon cycle?
One of Ronald Reagan’s most infamous “gaffes” was that trees produce more pollution than cars. But at least some environmentalists...
11 Sep, 2019| Science Notes

The picture of Dorian Hurricane
With Hurricane Dorian pounding Grand Bahama, those who live in Florida are being advised to brace for the impact, while...
04 Sep, 2019| Science Notes

Climate Emergency Tour: Regina Edition
Our continuing survey of the climate history of Canadian cities, made possible by the website weatherstats.ca, continues with a visit...
04 Sep, 2019| Climate Emergency Tour

It had to be
Scientific American chortles that scientists have explained why West Antarctica is losing ice. No prize for guessing: It’s “Global Warming”,...
04 Sep, 2019| Science Notes

Climate emergency tour: Montreal edition
Our tour of Canadian cities suffering the horrors of the climate emergency takes us today to Montreal PQ, where records...
28 Aug, 2019| Climate Emergency Tour

The trees talk to him
Jim Steele finds that time spent with trees is instructive as well as enjoyable. Specifically, teaching students about the history...
28 Aug, 2019| Science Notes

Climate Emergency Tour: Calgary Edition
In our continuing series on Canadian cities enduring the horrors of the climate change emergency, today's stop is Calgary. Here...
21 Aug, 2019| Climate Emergency Tour

Greenland is cooling down
No, it’s not a typo. Greenland is colder and icier now than for most of the past 10,000 years. If...
21 Aug, 2019| Science Notes

Vancouver: Where's the climate emergency?
The latest stop in our continuing tour of Canadian cities declaring a so-called Climate Emergency is Vancouver BC, where the...
31 Jul, 2019| Climate Emergency Tour

Not for all the warming in China
Cities grow, and as they do, they heat up. The so-called Urban Heat Island effect is a big problem for...
31 Jul, 2019| Science Notes

Halifax: Where are the heatwaves?
In our continuing travels through Canadian weather records based on the weatherstats.ca website, today's destination is Halifax NS. Last weekend...
24 Jul, 2019| Climate Emergency Tour

Those terrible Middle Ages
It’s remarkable how often “medieval” is used as an all-purpose insult in public discussion and popular culture. But it’s a...
24 Jul, 2019| Science Notes

When Great Lakes misbehave
One of the main reasons for our skepticism about the climate alarmist movement is their tendency to point to a...
17 Jul, 2019| Science Notes

Here comes the rain
David Leonhardt of the New York Times denounces “A flood of lies” because it rained hard in Washington, D.C. on...
17 Jul, 2019| Science Notes

Don't tell the polar bears
Last week we introduced the website weatherstats.ca from which you can easily obtain long term charts of all kinds of...
10 Jul, 2019| Science Notes

Extreme cold deadlier than extreme heat
In anticipation of the inevitable headlines reacting in astonishment to the inevitable summertime heatwaves as if we never used to...
10 Jul, 2019| Science Notes

CO2 hurts plants
One of the stranger attempted refutations of climate skepticism hurled at us recently (on Facebook) was a 2018 Harvard study...
10 Jul, 2019| Science Notes

Some truly man-made warming
The Climate Research Unit or CRU at the University of East Anglia is one of a few places where weather...
03 Jul, 2019| Science Notes

Heatwaves then and now
Via a CDN correspondent we recently learned of the remarkable website weatherstats.ca. It lets you see today's temperature across the...
03 Jul, 2019| Climate Emergency Tour

How many degrees have you got?
No, it’s not one of those sneers directed only at skeptics, while lawyers, restaurant managers and political scientists pontificate about...
03 Jul, 2019| Science Notes

A burning question
Are forest fires getting bigger or more numerous due to climate change? We'd be doing what we criticize others for...
26 Jun, 2019| Science Notes

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