If we're going to put the brakes on climate change, electric cars will be crucial. At least, that's the general consensus: Get the heck out of that Hummer, and into something without an exhaust pipe. At least seven countries plan to ban the sale of cars with internal combustion engines sometime in the next few decades, and the specter of losing out on markets like the UK, France, and most of all China (the world's biggest car buyer) has pushed the auto industry to mobilize.

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