Slate's EV Acid Test: Are electric cars greener?

Every electric car advocate is asked the same question every day: Are EVs really cleaner, greener, better for the environment? The long tailpipe, and all that. Slate, the online magazine, has an enviro Q&A column, The Green Lantern, that asks the question today.

Driving one still has an environmental cost, mostly associated with the use of Santa's most feared stocking-stuffer: 49.7 percent of our nation's electricity is generated by the burning of coal. But if you break down the numbers, EVs still come out ahead of cars featuring internal combustion engines, especially in terms of carbon dioxide emissions.

...The real question, then, isn't whether EVs are environmentally superior to today's gas-powered cars, but how they stack up against another technological rival: plug-in hybrids. The Lantern promises to tackle that question soon.