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Once thought too polluting, the two-stroke engine makes a comeback in advance of stricter fuel efficiency standards.
A hydraulic hybrid technology lets trucks burn a third less fuel than they normally would.
Design cuts pollution–but is it practical?
A supercritical diesel engine could increase efficiency and cut emissions.
David Victor explains why emissions trading alone won’t be adequate to address global warming.
Efforts to reduce pollution will let scientists see how the climate responds.
NASA has quantified the amount of pollution that moves from East Asia to North America.