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Disappearing polar bears and permafrost : is a global warming tipping point embedded in the ice? : h

United States. Congress. House. Committee on Science and Technology. Subcommittee on Investigations and Oversight.
Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2008. 2008

Examining threats and protections for the polar bear hearing before the Committee on Environment and

United States. Congress. Senate. Committee on Environment and Public Works, author.
Washington : U.S. Government Printing Office, 2014. 2014

On thin ice : the future of the polar bear : hearing before the Select Committee on Energy Independe

United States. Congress. House. Select Committee on Energy Independence and Global Warming.
Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2010. 2010