This undated image provided by Ohio State University shows Ellesmere Island National Park in Canada. Ohio State University researchers and their colleagues have discovered the remains of a mummified forest that lived on the island 2 to 8 million years ago, when the Arctic was cooling. This mummified forest is giving researchers a peek into how plants reacted to ancient climate change. That knowledge will be key as scientists begin to tease out the impacts of global warming in the Arctic.(AP Photo/Ohio State University, Joel Barker)
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