On February 2, 2007, the Intergovernmental Panel on Climate Change (IPCC) released a summary of the current science of climate change. The summary, directed at policymakers, is based on six years of review of scientific literature by experts from around the world, convened under the auspices of the IPCC's Working Group I. The summary is the first portion to be released from the IPCC's Fourth Assessment Report. Subsequent portions will be released later this year.

According to the IPCC, the report from Working Group I on the science of climate change answers:

What progress has been made in understanding and attributing climate change?

What do observations of the atmosphere, oceans, sea level, snow and ice tell us?

How has climate been behaving in the last hundreds of thousands of years?

Which are the projections of future changes?

Scientists from all over the world contributed to the findings discussed in the Fourth Assessment Report. For more information on the work of some of these scientists, visit: National Center for Atmospheric Research.