It's a line the American public has been hearing for a while—switch to an electric car and save the environment. But in China, where there are more than 100 million electrically-powered scooters and cars, alternatively-powered vehicles may be worse for the environment than gasoline-powered vehicles, according to a report released Monday by a team from the University of Tennessee.

The problem in China comes from the way most electricity is generated—more than 75 percent of power in China is generated by coal. So, rather than look at vehicle-emissions alone, where electric cars easily beat gas- and diesel-powered cars, the researchers studied the environmental impact of the whole power chain.

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