Science Group Issues Climate Change Warning The American Geophysical Union, the world's largest organization of earth scientists, issues a consensus statement linking human activity to unprecedented climate changes that present cause for concern. The statement follows a debate in Congress in which some senators downplayed or even denied the existence of global warming. NPR's Richard Harris reports.

Science Group Issues Climate Change Warning

Science Group Issues Climate Change Warning

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The American Geophysical Union, the world's largest organization of earth scientists, issues a consensus statement linking human activity to unprecedented climate changes that present cause for concern. The statement follows a debate in Congress in which some senators downplayed or even denied the existence of global warming. NPR's Richard Harris reports.