Global climate changeth

The IPCC is the international group responsible for the best information/science on climate change, but the U.S. has a large federal research initiative independent of the IPCC. The "United States Global Research Program" has hundreds of scientists and policy-makers from many different agencies. Their assessments (last 2009) are published. Here are some links. Note also under Key Findings the following:

"Global warming is unequivocal and primarily human-induced.
Global temperature has increased over the past 50 years. This observed increase is due primarily to human-induced emissions of heat-trapping gases. (p. 13)"

You can download the 2009 report.

http://www.globalchange.gov/

http://www.globalchange.gov/publications/reports/scientific-assessments/us-impacts/key-findings

http://www.globalchange.gov/index.php?option=com_content&view=article&id=417&Itemid=401

http://www.globalchange.gov/publications/reports/scientific-assessments/us-impacts/download-the-report

Thanks to Leslie Rissler for summary and links.