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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 .As Tesla prepares to begin selling its Model S in smog-ridden China, the question is: do electric cars reduce air pollution?
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3 .And the answer is: it depends.
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4 .That on-the-one-hand-yes-but-on-the-other hand-no conclusion comes from a study predicting the impacts of electric cars in the U.S.to 2050.
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5 .It's in the journal Environmental Science and Technology.
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6 .The reason it depends is that we don't know the future.
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7 .Will batteries be cheap?
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8 .Will the U.S.have a law limiting carbon dioxide?
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9 .Which will cost less: oil or natural gas?
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10 .Depending on the answers, electric vehicles and hybrids might not reduce air pollution at all.
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11 .They could even make it worse.
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12 .Researchers ran 108 different computer models of how driving might change in the next few decades.
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13 .And it turns out the key to reducing air pollution isn't how many electric cars there are.
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14 .What matters is whether there are regulations in place to mandate reductions in CO2 and other pollutants.
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15 .As it stands, battery cars that run on electricity from burning coal can be more polluting than cars that get good mileage on gas.
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16 .And that's why a Tesla in China, where most electricity comes from coal, is no zero-emissions vehicle.
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17 .Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.
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