Terrestrial Biodiversity Adaptation Research Network

“Climatic changes in the distant past were driven by natural causes, such as variations in the Earth’s orbit or the carbon dioxide (CO2) content of the atmosphere. Today, and even more so in the future, climatic changes have another driver as well: human activities (IPCC 1996). The natural greenhouse effect from clouds, water vapor, and CO2, primarily, is responsible for some 33◦ C of surface warming...”

Root, T. L., and S. H. Schneider. 2006. Conservation and climate change: The challenges ahead. Conservation Biology 20:706-708.