California’s carbon-credit market often pays for greenhouse gas reductions that would’ve happened anyway
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“On a dairy farm in California’s Central Valley, Wesley Patterson squinted under a dusty baseball cap as he explained, over the roar of its natural gas-burning engine, the advantages of installing a methane digester. He pointed to several football-field-sized ponds of cow manure covered in industrial-strength tarps. The methane coming off the animal waste is…