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Four cities pledge to better manage overall energy use and cut greenhouse emissions.
With prospects dim for comprehensive climate legislation, companies focused on carbon emissions could fail or be forced to scale back their ambitions.
Precise combustion control cuts fuel consumption by more than 30 percent.
Economists and utilities say the draft legislation could help avoid costly regulations.
Newly outfitted robo-planes will monitor the Earth’s upper atmosphere in greater detail.
Microreactor developers race to turn troublesome gas into usable crude oil.