space, producing a small net cooling effect. Other human activities can influence local and regional climate but have only a minor influence on global climate.
The response of the climate system to GHG increases and other climate forcing agents is strongly influenced by the effects of positive and negative feedback processes in the climate system. One example of a positive feedback is the water vapor feedback. Water vapor is the most important GHG in terms of its contribution to the natural green-
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2 What We Know About Climate Change and Its Interactions with People and Ecosystems ."
Advancing the Science of Climate Change . Washington, DC: The National Academies Press,
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