Markey, D-Massachusetts, is Chairman of the Select Committee on Energy Independence and Global Warming.

CNN: Polar bear now listed as 'threatened' species

Finger presented the assessment to a joint hearing of the House Intelligence Committee and the Select Committee on Energy Independence and Global Warming.

NPR: U.S. Report Links Climate Change to Security

McClendon and other panelists at the hearing, convened by the House Select Committee on Energy Independence and Global Warming, want Congress to know that natural gas can have a more prominent role in America's energy future.

FORBES: Natural Gas: Booming In The Beltway