U.S. Government Climate Resources

Global Change: a government site with a nice feature of letting you click on a region of the U.S. to better understand the most pressing issues in that region

The U.S. EPA website with a lot of information about climate change science with suggestions for what you can do

An EPA climate change calculator; provides suggestions for ways to cut emissions and saving money

NASA Goddard Institute for Space Studies with research on global changes

Another NASA site with easily accessible images and data illustrating climate changes