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Six Nobel Laureates say averting world's climate crisis requires immediate energy research, conservation, and regulation. Watch a webcast of "Energy Self-Sufficiency in the 21st Century

Learn how climate scientists think about and model the risks of climate change as well as the issues in building and interpreting these models. Drawing upon his experience as a working member of the Intergovernmental Panel on Climate Change (IPCC), Michael Mastrandrea will discuss the implications and interplay between the science and policies, such as mitigation and adaptation. He will also provide an overview of some of the latest climate change research, including the IPCC's Fourth Assessment Report, which was released in 2007.

The United Nations Climate Change Conference starts today in Bali, Indonesia with more than 15,000 attendees from 180 countries expected. We look at the United States' role at the conference, and the prospects for a global agreement on cutting greenhouse gas emissions.

California passed the nation's first global warming legislation yesterday to cut the amount of greenhouse gases emitted in the state. Host Scott Jagow speaks to Daniel Kammen from UC Berkeley about what it means for businesses

A new law in California sets strict standards on greenhouse gas emissions, aiming to reduce the emissions 25 percent by 2020. How will the state meet these goals, and will its economy suffer? With Professor Dan Kammen.

Forum discusses the possible economics impacts of global warming. Professor Dan Kammen discusses the Stern Report and the economic implications of climate change.