Next Time You Visit a National Park, You Might Get a Lecture on Climate Change

Park rangers are increasingly talking to visitors about global warming.

The Abyss geothermal pool is seen October 8, 2012 in Yellowstone National Park in Wyoming. Yellowstone protects 10,000 or so geysers, mudpots, steamvents, and hot springs.Yellowstone National Park is America's first national park. It was established in 1872. Yellowstone extends through Wyoming, Montana, and Idaho. The park's name is derived from the Yellowstone River, which runs through the park. A
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