Arctic expedition records signs of global warming
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Today is Earth Day. Minnesotan and polar explorer Will Steger will spend the day on Ellesmere Island in the Canadian Arctic. Steger is leading a 1400-mile dogsled expedition across the island; he hopes to record the impact of global warming on the northernmost part of the North American continent. Morning Edition host Cathy Wurzer talked with Steger by satellite phone.
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