Is there an upper limit to the greenhouse gas effect?

Editor’s Note: Learn More About Climate recently received an interesting question through our Ask A Scientist feature: I have recently heard the claim that "the atmospheric absorption bands for CO2 are already saturated" so the addition of more CO2 to the atmosphere is moot. I trust this is not the whole story, and would like to understand why such a claim is not accepted by the (vast) majority of climate scientists. CU-Boulder second-year graduate student Anondo Mukherjee reached out to his colleagues at the Department of Atmospheric and Oceanic Sciences (ATOC). Here is Anondo's … [Read more...]