From the CO2Science Archive: In honour of the summertime imperative to stop and smell the roses which are now in bloom, we bring you the happy news that they will be bigger and more abundant as the planet gets more CO2. In 1993 there were 4 studies that examined the effect on Rosa Hybrida of 300 parts per million (ppm) extra CO2. The average gain was 26.5% with a standard deviation of 7.9%. And from 1984 to 2006 there were 9 studies that looked at the effect of 600 ppm extra CO2, which resulted in an average biomass gain of 27.6% with a standard deviation of 8.1%. So when you stop and smell them, breathe a little CO2 on them and they will thank you with a display of bright colour and sweet aroma.