UPDATE 1-Manure, trash and wastewater: U.S. utilities get dirty in climate fight
October 23, 2019 at 14:05 PM EDT
Joey Airoso has always been proud of his cows, whose milk goes into the butter sold by national dairy company Land O'Lakes. Now he has something new to brag about: the vast amounts of gas produced by his 2,900-head herd is powering truck fleets, homes and factories across the state of California.