A new light-guiding optic combines low cost with high efficiency.
An "adaptive" engine promises to make ethanol more competitive.
The Congressional stimulus bill could help create a new, advanced battery industry in the United States.
Pollutants emitted as a result of corn biofuel production could have serious impacts.
Researchers use a running rodent to test their device.
Storing energy with compressed air, rather than batteries, could cut the cost of hybrid vehicles.
Ralph J. Cicerone, president of the National Academy of Sciences, discusses the challenges of climate-change research.
How solar-thermal energy could shrink coal plants' carbon footprint.
Small, automatic electric vehicles will be demonstrated in two new projects.
Carbon nanotubes could replace expensive platinum catalysts and help finally make fuel cells economical.