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Wind and solar get all the attention, but a key path to lowering emissions involves finding a less expensive way to do carbon capture.
Converting methane to an alternative fuel using energy from the sun could reduce carbon-dioxide emissions.
The push to extend fracking to arid regions is drawing attention to water-free techniques.
Turning coal seams into underground gasification chambers could cut costs and pollution—if done right.
Not green at all, reports a study suggesting that the methane released by fracking and drilling makes it worse than coal.