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托福听力练习-科学美国人60秒:绿色电动车能源问题

2017-02-16 11:21:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：绿色电动车能源问题

　　科学美国人60秒中英文翻译：绿色电动车能源问题

　　科学美国人60秒英文文本

　　As Tesla prepares to begin selling its Model S in smog-ridden China, the question is:

　　do electric cars reduce air pollution?

　　And the answer is: it depends.

　　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.

　　It's in the journal Environmental Science and Technology.

　　The reason it depends is that we don't know the future.

　　Will batteries be cheap?

　　Will the U.S. have a law limiting carbon dioxide?

　　Which will cost less: oil or natural gas?

　　Depending on the answers, electric vehicles and hybrids might not reduce air pollution at all.

　　They could even make it worse.

　　Researchers ran 108 different computer models of how driving might change in the next few decades.

　　And it turns out the key to reducing air pollution isn't how many electric cars there are.

　　What matters is whether there are regulations in place to mandate reductions in CO2 and other pollutants.

　　As it stands, battery cars that run on electricity from burning coal can be more polluting than cars that get good mileage on gas.

　　And that's why a Tesla in China, where most electricity comes from coal, is no zero-emissions vehicle.

　　中文翻译请点击下一页

本文关键字: 托福听力练习 科学美国人60秒

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