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People who own all-electric cars where coal generates the power may think they are helping the environment. 电动汽车的用电来自燃煤发电厂，使用电动汽车的人可能认为他们保护了环境。 But a new study finds their vehicles actually make the air dirtier, worsening global warming. 但是一项新的研究表明，电动汽车实际上对空气污染更不利，且会加剧全球变暖。 The controversial study raises major questions over the future of 'green' cars. 这项颇受争议的研究提出了有关“环保”车未来的一些问题。 'Unfortunately, when a wire is connected to an electric vehicle at one end and a coal-fired power plant at the other end, the environmental consequences are worse than driving a normal gasoline-powered car,' said Ken Caldeira of the Carnegie Institution for Science, who wasn't part of the study but praised it. 卡耐基科学研究所（Carnegie Institution for Science）研究员肯·卡代拉（Ken Caldeira）说：“不幸的是，当一根线把电动车和一个燃煤发电厂连在一起时，造成的环境污染比普通的汽油车更严重。” 肯·卡代拉并未参与这项研究，但是对该研究表示赞赏。 Driving vehicles that use electricity from renewable energy instead of gasoline could reduce the resulting deaths due to air pollution by 70 percent, it concluded. 该研究指出，驾驶可再生能源发电的电动车来取代汽油车，可以使因空气污染造成的死亡率下降70%。 | 
