Changing our fuel source will not be much better than anything else, at this point in time. I believe we will be stuck in the age of fossil-fuels until we die. The fact is, anything invented (now) that will actually solve the energy demand will be purchased by the large oil and energy companies. The patents will be purchased and crushed. Not only because the energy companies will begin to loose money, but also because it would put thousands and thousands of people out of jobs. Imagine and unlimited source of energy (the sun is not an unlimited source; it's dark for roughly 8-12 a day: if you use batteries, you're still polluting the earth with used chemicals that are dangerous)
THere have been inventions that would solve the fuel problems, but we'll never see them.
I worked in auto parts for a few years and we used to have this guy come in and buy all of these strange (mix-matched) parts. I once asked him what he was doing and he said, I'm building a fuel-cell car. (hydrogen). He said that he was going off a design from Australia where these guys had built a fuel-cell that could drive a car 2,000 miles on a 2-liters of water and a gallon of gasoline. (I don't know how true this is) but he said that he had spoken with the guys and they aleady had it installed in their vehicle and it was performing. We'll have a hard time switching to it because of the energy companies. The only way for us to accomplish this would be for the people to boycott fossil-fuels until the companies found something we liked, (which there's no way that this could happen).