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PBS Newshour:Studying Alaska's ice and snow to track climate change
http://www.pbs.org/newshour/bb/scientists-read-layers-alaskas-ice-snow-track-climate-change/Published on Nov 17, 2014
Glacial ice is like nature's ancient history book, and today the story is climate change. Science correspondent Miles O'Brien reports from Alaska, where researchers are studying how warmer temperatures affect the ancient ice and the living things that depend on it.