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They are available now. The technologies required to put them into automobiles are available now. But McCain wants to drill the shit out of ANWR - an old Bush policy. McCain also wants to drill the shit out of American coastal areas. Also McCain wants to blow the shit out of mountains to get out all the dirty coal out that he can, with total disregard to the environment - just like Bush.
Lastly, even though McCain is trying hard to be green, he fails to understand the true impact of global warming. His $300 million, wrongly spent, does nothing to solve the climate crisis. McCain's insistence in allowing the "free market" economy solve that woe is Bushian to the core.
More McSame for a Do-Nothing President.