Last year was one of the hottest on record and new studies show polar ice melt accelerating. The latest on global warming and where the policy debate may lead.
senior reporter for climate change, Bureau of National Affairs
director of Pew Environment Group's global warming campaign
former assistant administrator for air and radiation at the Environmental Protection Agency (2001-05); now heads the environmental strategy section at Bracewell & Giuliani LLP.
climatologist and climate modeler, NASA's Goddard Institute for Space Studies