National climate change expert discusses Copenhagen summit
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![Dr. James Hansen](https://img.apmcdn.org/da288c4ef374c52ccf96af17b906c9292bb70d53/uncropped/81f93c-20070925-hansen.jpg)
Dr. James Hansen is a scientist at NASA's Goddard Institute for Space Studies in New York, a climatologist and a global warming expert.
NASA
As delegates from around the world meet in Copenhagen to discuss climate change, one of the nation's top climate scientists joins Midday to answer questions about the conference and about global warming.
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