Oh, hmmm. Cap and tax wouldn't solve anything because companies will just move the jobs elsewhere (given the liberal assumption that companies would rather profit than save the planet). And taxing companies wouldn't really do anything except jack up prices for consumers.
I'd say start throwing incentives at companies I suppose. Something along the lines of no income tax for for any company that manages to sell 10 million non-fossil fuel cars a year. Something along those lines.
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