A novel photovoltaic technology moves into large-scale production.
New metals will keep engines and turbines dry and ice-free.
The French carmaker doubts that hybrids can reduce emissions sufficiently.
A startup is selling cylindrical solar cells that can generate more power than conventional panels.
Thin but efficient solar cells use one-tenth the silicon of conventional cells.
A hybrid refrigerator will bring efficient, cheap cooling to India.
A last-minute addition to a financial bailout bill supports solar and wind power, as well as plug-in hybrids.
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.