Global Warming The debate on global warming has shifted. Worldwide, tailpipes and smokestacks spew 25 billion tons of carbon dioxide every year, and there's no longer doubt that this gas is heating the Earth. The new questions center around how much will our climate change, and how fast. NPR examines the issue.

Is Global Warming Threatening Polar Bear Habitats?

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Evangelical Leaders Urge Action on Climate Change

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NASA Scientist Feels Pressure Over Global Warming

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Science Fiction Writers Target Global Warming

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Hunting for the Threatened Ice Worm in Alaska

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Atlantic Ocean's 'Heat Engine' Chills Down

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