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This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.

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Atmospheric carbon dioxide levels have now touched 400 parts per million and keep rising.

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So who's responsible?

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Scientists peg the start of this seemingly inexorable rise to about 1750, when people started burning coal to run steam engines.

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But the CO2 increase also stems from activities like clearing forestlands for farming.

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Now a new analysis assigns national blame for CO2 pollution and its ensuing global warming.

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The seven biggest contributors both historically and today are, in alphabetical order: Brazil, China, Germany, India, Russia, the United Kingdom and the United States.

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The report is in the journal Environmental Research Letters.

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The undisputed champion of greenhouse gas pollution is no surprise: the U.S.

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Our emissions to date mean we're responsible for 0.15 degree Celsius of the 0.8 degree Celsius rise in global average temperatures: 19 percent of the total.

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That's more than twice as much as the next highest country, China.

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The worst polluting country per person? The tiny U.K.

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Unfortunately, China looks set to pass the U.S., unless their reliance on coal changes in short order.

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As for us, after several years of our greenhouse gas pollution falling, CO2 emissions rose again in 2013.

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Here's one area in which the U.S.shouldn't want to lead.

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Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.

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