This March 9, 2010 file photo shows a tanker truck passing the Chevron oil refinery in Richmond, Calif. A federal judge presiding over lawsuits accusing big oil companies of lying about global warming is turning his courtroom into a classroom. U.S. District Judge William Alsup has asked lawyers for two California cities and five of the world's largest oil and gas companies to come to court on Wednesday, March 21, 2018, to present "the best science now available on global warming." (AP Photo/Paul Sakuma, File)
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