Might want to try capitalism...
<...The consumer is the only one who can change this trend. The consumer has to choose the environmentally-friendly product, even though it is a little more expensive. It's not a situation you would bet money on. So the government has to do it - act in the public's interest in the absence of profit-making potential.
If in fact oil becomes scarce, its price will naturally rise above the price of its alternatives, and consumers will smoothly move to other sources of energy without government interference. Of course, if some jackass, pointy-headed socialist government decides to keep the price of oil artificially low so that "the poor can still drive cars," or some other dumbbell reason, all bets are off.