Biofuel is a terrible, terrible solution - We have a food crises already, and using vegetable oil would be like burning food in your car.
I mentioned hydrogen earlier. The problem with hydrogen is that it's incredibly energy-intensive to produce - However people are working on ways of producing it more efficiently. My earlier point was that people could use solar power in desert areas to produce hydrogen meaning that power requirements wouldn't be a problem - And it's something that's already being looked at,
people have made solar panels that actually produce hydrogen, although as a way to make solar panels more efficient rather than to use the gas.
I'm still sure you could use parabolic mirrors to generate electricity and split water to produce hydrogen though - I mean you can melt steel with this. Surely lots of these in a desert can be used to generate a lot of power? (And as a side note, the people who are building these want to use this power to generate a petrol substitute by super-heating air - They're working out how to do this but I won't believe it until I've seen it.
Full 7 minute clip here.):
And yeah, nuclear fuel doesn't produce any emissions, and during the time we've used it, there haven't been many accidents - I'm sure more people die on the worlds roads every week, or if not, every month, than have ever been killed by the results of nuclear power station accidents. But when there has been an accident, and like what's going on now in Japan, radiation leaks are serious business. You harm people and have the potential to make areas of land uninhabitable for hundreds of years.
Actually perhaps that's a good thing - Look at the zone of alienation near Chernobyl and how the wildlife has seemed to reclaim that area, because radiation doesn't effect other species in the same way as it affects us.