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Why California’s carbon manure math doesn’t add up
加州把牲畜粪便变沼气再当清洁燃料，但碳账本上其实藏着一笔糊涂账，看懂沼气减排的真实代价。
Something stinks in California’s climate policies. Years ago, the state set up a system that pays cattle farmers across the country to turn the methan…