The way the Land of the Rising Sun built and lost its dominance in photovoltaics shows just how vulnerable renewables remain to changing politics and national policies.
Severe droughts are forcing researchers to rethink how technology can increase the supply of fresh water.
The first commercial power plant to use carbon capture and sequestration shows the potential of a crucial technology.
Equipment for making microchips has led to solar cells that are twice as efficient as conventional ones.
Hybrids are a much more cost-effective way to reduce carbon emissions than newly released hydrogen fuel cell cars.
Inexpensive oil could increase the pressure to reduce mandates for biofuels.
Millions of batteries discarded with computers have more than enough life to power home lighting for one year, researchers in India say.
A new material that requires no electricity uses the universe as a heat sink—even when the sun is shining.
A new solar power system is easy to add to a roof, and performs its own safety checks.
China may put a stop to growing carbon dioxide emissions earlier than expected, but how quickly they start coming down is also important.