Yale Environment 360: U.S. scientists have developed what they say is the first integrated nanosystem capable of replicating the process of photosynthesis, a sort of artificial forest that could one day lead to the production of hydrogen that could be used to power fuel cells. Composed of nanowire structures -- including silicon trunks and titanium oxide branches -- the system mimics the role played by chloroplasts in promoting photosynthesis in green plants. By assembling the trees in a dense array, resembling...