The simple, non-polluting battery could be used in compact devices.
Forecasters see no need for new coal and nuclear power plants.
New manufacturing techniques could cut solar power costs by 20 percent.
A process that converts acids from garbage into fuel gets a boost.
A new process makes regenerating hydrogen fuel more efficient.
A new strategy could reduce coal plant emissions and cut the cost of solar power.
A platinum-free liquid cathode could cut fuel-cell costs by 40 percent.
Building denser cities would do little to reduce CO2 emissions, a new NAS report concludes.
An improved catalyst could reduce the cost of making methanol from methane.
Recent studies point to the potential of ultracapacitors to augment conventional batteries.