From the CO2Science Archive: We tend to focus on food crops in this series. But plants serve lots of purposes including, of course, supplying fibres of which cotton is a key one for durability and comfort alike. Gossypium hirsutum L. is the name of the plant that yields this essential fibre. From 1987 to 2017 there were 43 studies that found an extra 300 ppm of CO2 boosted cotton yields on average by 56.5 percent, while one study found an extra 600 ppm boosted yields by 27 percent. So not only does CO2 help us grow more food, but it helps us produce more cotton to wear while we’re eating it.
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Percent dry weight (biomass) increases for 300 and 600 ppm increases in the air's CO2 concentration: cotton
16 Apr 2025 | Science Notes
That’s nice, but CO2 can’t move the dial on food production anything like farmers can,
What they plant, how much they plant, what the demand and hence profitability of certain crops, use of new crop strains, fertilizer use, irrigation use, advances in pest control, transportation and storage are way ahead of 2 ppm per year of CO2 increase….with bad weather still being a big variable for farmers. That’s why world food production is way up, not CO2. Maybe CO2 and ag products curves seem to be a statistical “fit” … but so does use of NSAID’s for headaches and backaches.
Doug, Plants are coming up from an effectively 'starving' situation. C3 photosynthesis originated when CO2 levels were in the thousands, not below 300. Imagine having been gasping for air because you're out of breath, but you're forced to breathe through a straw. Now suddenly the straw is increasing in diameter. You're going to be feeling a LOT better very quickly. This is what's happening to plants right now, being up from close to actual death by asphyxiation.