1. Revive Detroit
Contrary to popular belief, going sustainable could help, not hurt carmakers. If the Big 3 and others are willing to invest and research in renewable technology, they can retake the title as the most important car manufacturers in the world.
2. Create jobs
We need people to build and sustain renewable energy facilities. It's not like wind turbines can't fall apart.
3. Start a scientific boom
Renewable energy is not yet as profitable as investors would like (if it was, we wouldn't still be burning oil). America can take the lead in researching and developing sustainable technologies.
4. Eliminate our dependency on the Middle East and Russia
Russia and dictatorships would lose much much much much much of their influence if we were to stop buying their oil and gas. For example, why would China have any need to block further efforts by the U.S. and Europe to end the genocide in Darfur?
And maybe I'll think of some more in the morning ;D
I apologize for the ongoing light posting. Besides a busy schedule (which lightens up for the next few weeks) I have lime disease :(, so I'm constantly tired and not always able react quite like I might normally. But that should be gone soon as well.