Ok, here is the next liberal solution (I have heard this one several times, and they said it with a straight face): Cut the world population to around 100 million or so. That's over a 99% reduction, people, and even less viable than some other "radical" solutions. And don't get me started on the fallacy of the Malthusian doctrine.
BTW, I agree that once fossil fuels start running dry, people WILL suddenly be clamoring for nuclear power, ethanol, biodiesel, etc., whatever energy forms are being shunned by greenies right now. And keep this in mind: the military will have to stockpile years of fossil fuel if it comes to a crisis in supply, We might as well start making more progress in nuclear power right now.