FILE PHOTO: Biogas, methane collected from dairy farms, is piped into a cleaning facility at the Calgren facility in Pixley, California, U.S., October 2, 2019. REUTERS/Mike Blake

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FILE PHOTO: Biogas, methane collected from dairy farms, is piped into a cleaning facility at the Calgren facility in Pixley, California, U.S., October 2, 2019. REUTERS/Mike Blake