Written by Alison Cassady and Emily Figdor of the U.S. Public Interest Research Group (U.S. PIRG) Education Fund, July 2007.

©U.S. PIRG Education Fund issues this report under a Creative Commons "some rights reserved" license. You are free to copy, distribute or display the work for non-commercial purposes, with attribution. For more information about this Creative Commons license, visit

Cover photo: Alexey Kardakov/FOTOLIA.

The authors wish to thank Brenda Ekwurzel, Ph.D., Climate Scientist at the Union of Concerned Scientists, and Paul R. Epstein, M.D., M.P.H., Associate Director, Center for Health and the Global Environment, Harvard Medical School, for their review of this report. Affiliations are listed for identification purposes only.

This report is made possible with funding from The Pew Charitable Trusts.

The opinions expressed are those of the authors and do not necessarily reflect the views of our funders or those who provided editorial review. Any factual errors are strictly the responsibility of the authors.

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