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.
A big investment in data-driven city management starts to pay off.
Coupled computer models will help officials know what to do as intense storms approach.
The effects of atmospheric carbon linger for centuries, so historical emissions totals are relevant context for the global climate policy debate.