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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 .Remember when a barrel of oil cost more than $140?
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3 .That was way back in 2008.
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4 .Nowadays, cars and trucks have been made to go farther on less fuel.
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5 .Alternatives like ethanol have boomed.
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6 .And fracking has unleashed a flood of oil formerly trapped in shale rock underneath North Dakota, among other places.
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7 .As a result, oil prices have fallen, far.
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8 .The price of a barrel of oil has dropped below $60.
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9 .But what's good news for drivers is bad news for the global bid to cut climate changing pollution.
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10 .Burning oil in vehicles is the second largest source of fossil fuel pollution.
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11 .It's also bad news for alternatives, like new facilities that turn corn stalks into ethanol.
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12 .Hybrids and electric cars are less popular when gas is cheaper.
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13 .In fact, the sport-utility vehicles of yesteryear are staging a comeback.
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14 .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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15 .Of course, in the long run oil prices are likely to go back up.
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16 .It's just a question of how much environmental damage gets done before that happens.
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17 .Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.
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