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

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What goes up and doesn't come down?

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Greenhouse gas emissions, apparently.

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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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The 2012 contribution keeps us on pace for not one more degree Celsius of warming, or even two,

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as is the avowed goal of the international climate negotiations that saw another inconclusive round conclude this past week.

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We are on track for three degrees C of warming or more, this century.

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That calculation comes from the International Energy Agency, a kind of cartel for oil-consuming rich nations.

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But don't despair.

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The U.S.in recent years has reduced its greenhouse gas emissions back to levels last seen in the 1990s.

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That's thanks mostly to burning less coal.

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And there are some quick and easy steps that could reduce emissions globally: more energy efficiency,

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less leaking methane, an end to fossil fuel subsidies and a ban on inefficient coal-fired power plants.

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

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