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段落1

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

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Remember when a barrel of oil cost more than $140?

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That was way back in 2008.

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Nowadays, cars and trucks have been made to go farther on less fuel.

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Alternatives like ethanol have boomed.

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And fracking has unleashed a flood of oil formerly trapped in shale rock underneath North Dakota, among other places.

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As a result, oil prices have fallen, far.

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The price of a barrel of oil has dropped below $60.

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But what's good news for drivers is bad news for the global bid to cut climate changing pollution.

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Burning oil in vehicles is the second largest source of fossil fuel pollution.

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It's also bad news for alternatives, like new facilities that turn corn stalks into ethanol.

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Hybrids and electric cars are less popular when gas is cheaper.

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In fact, the sport-utility vehicles of yesteryear are staging a comeback.

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But back on the good news front: a falling price of oil reduces the incentive to do expensive things to get the liquid fossil fuel, like drill in the Arctic or mine Canada's boreal forest for tar sands.

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Of course, in the long run oil prices are likely to go back up.

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It's just a question of how much environmental damage gets done before that happens.

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

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