Electric cars are kind of a holy grail of green technology. Though it's important to keep in mind where the electricity would ultimately come from -- solar? wind? coal? -- it would be a pretty huge accomplishment. So how could you improve upon the efficiency and green-ness of electric cars? Alyssa Danigelis at Discovery found a way -- V2G:
Wouldn't it be awesome if we could have a two-way charging system when electric vehicles become widely available? That way the cars could store some power and serve as a backup electricity source in a pinch.