U.S. national parks are also national treasures, especially those in the American West where snow-covered mountains, dense forests and untamed rivers seem to symbolize the American spirit. But 12 of America's most cherished national parks are threatened by global warming--and the dangers are growing rapidly--according to a new report by two leading environmental groups. Learn more about the threats to U.S. national parks from global warming and what you can do to help.
_{Photo courtesy of Mike Rash}

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