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By Mark J. Lara, The Conversation
The words “climate change” tend to invoke images of heat and storms and smog-filled air. But one of the greatest global warming risks may start in the ground.
By Leigh Anne Tiffany
On the Alaskan tundra, researchers are tracking the march of global warming. Science correspondent Miles O’Brien explores how soil composition and the sleep schedules of squirrels might offer data on the ways warmer temperatures are affecting ecosystems.
By PBS NewsHour
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