US Climate Extremes Index-the National Climatic Data Center's Climate Extremes Index, which uses temperature and precipitation records to see if the U.S. climate is getting more extreme.

ASA Climate Change Policy Advisory Committee (CCPAC)-from American Statistical Association

A Statistical Consensus on Global Warming-The workshop "A Statistical Consensus on Global Warming", October 26-27 2007 was held at NCAR in Boulder, Colorado. This activity was sponsored by the American Statistical Association and hosted by the Institute for Mathematics Applied to Geosciences (IMAGe.)

Climate Change Science Compendium -2009 report on observations since the IPCC Fourth Assessment Report from the UN Environment Programme

The National Center for Atmospheric Research-

The Regional Integrated Science Collective - RISC-

World Climate Research Programme- provides climate predictions through observations and modeling of the Earth system and the policy-relevant assessment of climate conditions.

Working Group I of the Intergovernmental Panel on Climate Change - Working Group I (THe Physical Science Basis) of the Intergovernmental Panel on Climate Change.

The Discovery of Global Warming- A History- A hypertext history of how scientists came to (partly) understand what people are doing to cause climate change.

America's Climate Choices- In response to a request from Congress, the National Academies have launched America's Climate Choices, a suite of studies designed to inform and guide responses to climate change across the nation.

Workshop on development of a global surface temperature data set. The site contains a sequence of White Papers on different aspects of the problem.