A woman attends a public hearing about the gas leak before the South Coast Air Quality Management District. The agency has ordered Southern California Gas Co. to permanently shut down the well, and is suing the company for negligence. David McNew/Getty Images hide caption

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"Solar trees," which suspend solar panels over parking spaces in San Diego, collect electricity. Generating solar power like this is just one rung on a ladder the city will have to climb to reach 100 percent renewable energy by 2035. Clare Trageser /KPBS hide caption

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A Porter Ranch resident wears a gas mask during a protest Saturday outside a meeting of the Air Quality Management Board over the Aliso Canyon gas leak. The leak started in October and has forced thousands of residents to flee from the Los Angeles suburb of Porter Ranch. Regulators have ordered the gas company to shut down the leaking well; some residents want the entire facility shuttered. Mark Ralston/AFP/Getty Images hide caption

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A customer fills up at a gas station in Chillicothe, Ill., in December. Low prices have meant big savings for consumers, but urban planners worry that cheap gas will encourage sprawl. Bloomberg/Bloomberg via Getty Images hide caption

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Passengers walk through the terminal as they head to their flights at Reagan National Airport in Arlington, Va., on Dec. 23, 2015. Saul Loeb/AFP/Getty Images hide caption

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The plastic sheet invented by Stanford University chemical engineer Zhenan Bao and her colleagues can be inserted in lithium-ion batteries to avoid overheating. Zheng Chen/Courtesy of Zhenan Bao hide caption

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U.S. Secretary of State John Kerry (left) meets with Iranian Foreign Minister Mohammad Javad Zarif (right) in Vienna on Saturday. The International Atomic Energy Agency, or IAEA, has verified that Iran has met all conditions under the nuclear deal. Kevin Lamarque/AP hide caption

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This photo taken Nov. 3, 2015, shows SoCalGas crews and technical experts attempting to safely stop the flow of natural gas leaking from a storage well at the utility's Aliso Canyon facility in Los Angeles. Efforts to plug the well appear to have destabilized it, the Los Angeles Times reports. Javier Mendoza/AP hide caption

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The federal government will stop issuing new coal leases on some 570 million acres of federal land, under a new plan being released Friday. In this photo from 2013, coal is loaded onto a truck at a mine built on federally controlled land in Montana. Matthew Brown/AP hide caption

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"By the middle of the next decade, the cars and trucks we buy will go twice as far on a gallon of gas," Obama promised in 2013. "That means you'll have to fill up half as often; we'll all reduce carbon pollution." Nati Harnik/AP hide caption

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Bo Sailor watches Thursday as high surf crashes into the seawall before spilling onto Channel Drive in Montecito, Calif. An ocean-water-quality advisory was issued for the area after a number of December and early-January storms pummeled Southern California with heavy rainfall. Mike Eliason/AP hide caption

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