Is there an upper limit to the greenhouse gas effect?

Greenhouse Effect on Venus

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...]

Amazonian drought conditions add carbon dioxide to the atmosphere

Amazon River through the rainforest

This article originally appeared on the University of Colorado Boulder website. As climates change, the lush tropical ecosystems of the Amazon Basin may release more of the greenhouse gas carbon dioxide into the atmosphere than they absorb, according to a new study published Feb. 6 in Nature. An international team of scientists found that the amount of yearly rainfall was the driving factor behind the amount of carbon dioxide (CO2) taken up and released from Amazonia in 2010 and 2011. During a wet year, the Amazon forests were roughly carbon-neutral: Forests “inhaled” more carbon … [Read more...]