President Trump has vowed to bolster the country's oil industry. Oil companies in California have cheered that, but it's not clear how much Trump can actually help them. There are global forces at work, and many state lawmakers have vowed to fight the president. The majority of the state's oil comes from Kern County in the Central Valley, so KQED Science reporter Lauren Sommer went to visit.
California Oil Sees Ally in Trump, Even if He Can't Really Help Them

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