Supporters of pending legislation see it as an important step toward meeting the state’s climate goals while using its ample farmland. But critics say natural carbon sequestration is hard to measure and verify. By Emma Foehringer Merchant On a windy July day in 2017, temperatures started climbing early in Pauma Valley, California, an unincorporated community about 50 miles northeast of San Diego. Staff at Solidarity Farms, a 10-acre cooperative, were busy that morning, preparing for a 30-degree spike in temperature.

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