The MIT Technology Review reports that important progress has been made toward the goal of producing hydrogen fuel (and oxygen) from water using solar photovoltaic cells. It is a process they call "artificial photosynthesis."
Admittedly, scientists aren't all the way there yet. But progress has been made in the construction of the solar cells, getting closer to the 25% efficiency required to make the process economically feasible.
This technology could become a real game changer. Burning hydrogen fuel merely leaves water as the product of combustion, a very clean alternative to all combustable fuels in use today. Hat tip to Instapundit for the link.