“What would happen if CO2 doubled from the current approximately 400 ppm in the atmosphere to 800 ppm? Crop yields worldwide would increase by about 40%, based on empirical findings of how CO2 concentrations affect crop yields.” (Lindzen and Happer, below) “Greenhouse Gases and Fossil Fuels Climate Science” by Richard Lindzen (MIT) and William Happer … Continue reading On the CO2 Fertilization Effect (real science for EPA)