The potential of solar energy remains unfulfilled.
A new engine design could significantly improve fuel efficiency for cars and SUVs, at a fraction of the cost of today's hybrid technology.
No matter how well they're engineered, hydrogen cars offer no real answer to the imminent threats posed by global warming.
One of the largest solar energy plants in the world went on line in Portugal this winter.
Washington's growing interest could help make plug-in hybrids more affordable. The payoff: 150 miles per gallon.
A Canadian government decides that coal plants must clean up their act.
A direct method of converting methane into useful chemical compounds could reduce the release of the potent greenhouse gas at isolated oil fields.
New reactor technologies offer poorer nations cheap, safe, efficient power. Sanctions designed to prevent the proliferation of weapons impede their use. What would a better policy look like?
Fuel from grass and wood chips could be big in the next 10 years--if the government helps.
A new process turns the greenhouse gas into useful materials.