As you may know I have been really skeptical about how much longer we can use non-renewable fuels to supply our energy needs. The current renewable energy sources (wind, solar, biomass etc.) are by far not efficient enough to take over once fossils fuels will get scarce. I was wondering whether it would be possible to directly generate hydrogen from water using sunlight and a catalyst. Looks like someone figured out a way: http://www.sciencemag.org/content/early/2012/11/07/science.1227775.full What is really encouraging is the high quantum yield of ~60% although they use only a narrow light spectrum of ~520 nm. Nevertheless, it is a good place to start.