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St. Paul, Minn.

The cost of global warming

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A chimney emits steam
Experts have announced that current levels of the greenhouse gases carbon dioxide and methane in the atmosphere are higher now than at any time in the past 650,000 years.
Photo by Christopher Furlong/Getty Images
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A chimney emits steam
Experts have announced that current levels of the greenhouse gases carbon dioxide and methane in the atmosphere are higher now than at any time in the past 650,000 years.
Photo by Christopher Furlong/Getty Images