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.
Experts analyze the debate held at EmTech08.
Martin LaMoinca analyzes Vinod Khosla's keynote on renewable energy and a panel on "Green Transportation".
A simple catalytic process converts plant sugars into gasoline, diesel, and jet fuel.