You'd be surprised what happens when people are risking their own money. But now we're just getting into Capitalism 101..

Edit: I feel like I have to clarify this everywhere perhaps because it's an unorthodox viewpoint: of course companies need to be regulated; I'm arguing against government-sponsored incentives and subsidies. Stick to making it more expensive to burn fossil fuels, thereby increasing receipts (use it to fund alternatives research, studies, etc similar to how Big Tobacco has to pay for anti-smoking ads) instead of less expensive to buy someone's product, at the cost of taxpayer dollars.

Oh, I doubt I'd be surprised. :)