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1 .This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.
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2 .What goes up and doesn't come down?
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3 .Greenhouse gas emissions, apparently.
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4 .The world set another record in 2012, spewing some 31.6 billion metric tons of carbon dioxide, methane, hydrofluorocarbons and other greenhouse gases into the air.
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5 .The 2012 contribution keeps us on pace for not one more degree Celsius of warming, or even two,
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6 .as is the avowed goal of the international climate negotiations that saw another inconclusive round conclude this past week.
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7 .We are on track for three degrees C of warming or more, this century.
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8 .That calculation comes from the International Energy Agency, a kind of cartel for oil-consuming rich nations.
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9 .But don't despair.
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10 .The U.S.in recent years has reduced its greenhouse gas emissions back to levels last seen in the 1990s.
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11 .That's thanks mostly to burning less coal.
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12 .And there are some quick and easy steps that could reduce emissions globally: more energy efficiency,
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13 .less leaking methane, an end to fossil fuel subsidies and a ban on inefficient coal-fired power plants.
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14 .If we did all of those, we might get on a new track that leads to a world that's less hot and bothered.
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15 .Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.
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