President Trump painted a golden future of “great wealth” and “great jobs” powered by oil pumped from the ocean floor as he signed an executive order on Friday to consider new offshore drilling around the country.

But his efforts could splash harmlessly against the hardened barricades that California has been fortifying for decades with regulation and legislation to prevent additional drilling along its treasured coast.

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“I’m not worried about seeing oil derricks out there any time soon,” said Deborah A. Sivas, director of Stanford University’s Environmental Law Clinic. “There are a lot of roadblocks.”