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Electric cars powered by hydrogen fuel cells don’t produce greenhouse-enhancing carbon dioxide. But producing hydrogen does-and if we want to reduce our petroleum dependence, we’re going to have to reconcile ourselves to that fact.
Falling costs are making fuel-cell vehicles look like a plausible alternative to conventional cars.
AltaRock has figured out how to use fracking to get more heat out of a geothermal well, but work remains before the energy source can dent carbon emissions.
Nokia hopes to create a device that could harvest enough power to keep a cell phone topped up.
Amprius’s silicon-based batteries are starting to appear in electronics.
A device for power tools may also help regenerative braking.
A Scottsdale, Arizona-based startup is now selling batteries that promise to be a cheaper alternative for grid backup.
Once thought too polluting, the two-stroke engine makes a comeback in advance of stricter fuel efficiency standards.
Sun Catalytix is making a new type of flow battery that could store hours’ worth of energy on the grid.