A simple new process generates hydrogen for fuel cells.
A new membrane-free water-purification system uses small amounts of energy.
A city being built in Abu Dhabi will serve as a large-scale test for renewable energy.
Oil money is being enlisted to build a city that will use no oil and produce no carbon emissions.
Even with oil prices soaring, by some estimates, they're still short of historic highs.
Hybrids, plug-ins, and extended-range electric cars are hitting the market. Use this interactive primer to learn how they work.
Crystals could capture greenhouse gases released by power plants.
A new lithium-ion battery from A123 Systems could help electric cars and hybrids come to dominate the roads.