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World leaders need to take a holistic approach to climate change that focuses on sustainable development and protecting biodiversity. There’s a glaring need for consensus and an urgent need for action and strong political support, particularly at the national government level, according to a survey of climate change experts.

Outspoken NASA climatologist and IPCC author Jim Hansen gives an update on global warming, tipping points and the massive extinctions that could result.

An IPCC report this week linked climate change and drought to shortages in food, and warned that lack of fresh water could lead to a global food crisis.

Dr. Rajendra Pachauri, Chairman, Intergovernmental Panel on Climate Change (IPCC);  testifies before the House Select Committee on EnergyIndependence and Global Warming on the impact of climate change on the least privilaged.

 Dr. John Marburger, Science Adviser to the President and Director of the Office of Science and Technology Policy (OSTP), outlines the planthe Bush Administration is pursuing to minimize climate change and achieve energy security, emphasizing the development of newtechnologies like carbon sequestration and the importance of an international framework that holds all countries accountable.

IPCC Climatologist Stephen Schneider talks about the need for government to restrict people's rights to make global warming worse IPCC Climatologist Stephen Schneider talks about the need for government to restrict people's rights to make global warming worse on a personal level, when better options are available.

The Chairman of the Intergovernmental Panel on Climate Change presents the U.N.Secretary General with the IPCC's Synethesis Report. The Chairmanand Secretary General deliver remarks and take questions at a press conference.

"Climate change will come stronger than expected and sooner than expected": why is this and what can be done about it?

There's always a chance that climate science has got things wrong, a fact which is illustrated by the IPCC's confidence intervals - which tend to be large - and error bars. (The IPCC says, for instance, there is "at least a 9 in 10 chance" that human activities are causing changes in our global climate.) Given that chance - how lucky do you feel?