This summer, a group of power companies in Japan and Canada developed I an unusual interest in pig manure. The porcine waste was at the heart of a landmark multimillion-dollar deal between Chile's largest pork producer and the power companies, allowing the latter to emit more pollution. The pig farm promised to recycle its animals' emissions of methane -- a potent greenhouse gas -- by covering the manure, capturing the gas, and burning it as sustainable energy, In return, the power companies bought the right to emit more carbon dioxide from their stations, half a world away from the oblivious pigs.
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