Thin but efficient solar cells use one-tenth the silicon of conventional cells.
A hybrid refrigerator will bring efficient, cheap cooling to India.
Free-piston engines could be used to generate electricity as efficiently as, and less expensively than, fuel cells.
BP's chief scientist, Steven Koonin, says cutting greenhouse emissions will take major changes.
A simple catalytic process converts plant sugars into gasoline, diesel, and jet fuel.
The production design is ready, but the electric vehicle's battery needs work.
Color-coded bacteria light the way to oil spills at sea.
A novel design could boost energy storage.
Amid rising seas, a California modeling effort recommends abandoning land tracts in the Sacramento Delta.
A new material could cheaply convert sunlight into hydrogen.