Elon Musk has always dreamed big, and tonight he showed off his biggest reverie yet: the fully electric Tesla Semi. The big rig, which Musk unveiled at Tesla's design center in Hawthorne, California Thursday night, is just the latest step in his mission to make humanity forget about planet-killing fossil fuels and embrace the gospel of electric power. That is, of course, if he can convince the trucking industry it's time for a new way of moving stuff around--and if he can actually make the thing. Musk believes that going after the big boys is the best way to have a real impact on climate change. In the five years since Tesla started producing its Model S sedan, it has sold about 200,000 cars.

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