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Bovine waste is typically stored in vast open lagoons that emit methane—a greenhouse gas more than 80 times as potent as carbon dioxide over 20 years— making agricultural waste the single biggest contributor to the country’s total methane emissions from human activity. Both biogas and fossil natural gas are mostly methane, and though they burn more cleanly than the megapolluter coal, they still emit carbon dioxide. But by diverting cow poop into biodigesters in the process of making RNG, gas companies argue, the effect is a net climate win. Virginia-based utility giant Dominion Energy Inc. claims that supplying only 4% of its customers with biogas would be enough to offset the emission from its entire gas system.