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Dr. James Hansen vs. Senator Ron Johnson

April 25, 2014; 6:43 PM ET

Last month the U.S. Senate held a hearing in regards to the proposed Keystone XL Pipeline.

Dr. James Hansen, who is the former director of NASA's Goddard Institute for Space Studies (GISS) was one of the members of the expert panel. Hansen is currently an adjunct professor in the Department of Earth and Environmental Sciences at Columbia University.

During the hearing, Hansen made his case against the proposed pipeline and then encountered some questions from Senator Ron Johnson (R) of Wisconsin. Johnson serves on the committees on the Budget, Commerce, Science and Transportation, Foreign Relations, Homeland Security and Governmental Affairs and Small Business and Entrepreneurship.

Below is a clip of the exchange courtesy C-SPAN. In the exchange Johnson questions Hansen about climate change and the recent slow-down in warming.

Here is a link to other clips from the Keystone XL hearing, courtesy of C-SPAN

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