Pollution laws and regulations

FILE - In this Oct. 26, 2018, file photo, downtown Los Angeles is shrouded in early morning coastal fog and smog. General Motors, Fiat Chrysler, Toyota and many others in the auto industry are siding with the Trump administration in a lawsuit over whether California has the right to set its own greenhouse gas emissions and fuel economy standards. (AP Photo/Richard Vogel, File)

FILE - In this Oct. 5, 2015 file photo the VW sign of Germany's car company Volkswagen is displayed at the building of a company's retailer in, Berlin, Germany. Diesels bought back by Volkswagen during its emissions-cheating scandal are trickling back into the marketplace after being brought up to emissions standards. Bargain hunters may be intrigued by the high fuel economy and refreshed warranties of these fun-to-drive used diesels. (AP Photo/Markus Schreiber, File)

President Donald Trump speaks at the 9th annual Shale Insight Conference at the David L. Lawrence Convention Center, Wednesday, Oct. 23, 2019, in Pittsburgh. (AP Photo/Evan Vucci)

Ted Wells, Jr., center, the lead attorney for Exxon, leaves Manhattan Supreme court after opening arguments in a lawsuit against Exxon, Tuesday, Oct. 22, 2019, in New York. The lawsuit brought on by New York's attorney general, claims the Texas energy giant kept two sets of books — one accounting for climate change regulations and the other underestimating the costs — to make the company appear more valuable to investors. (AP Photo/Mary Altaffer)

FILE - In this Oct. 8, 2019, file photo, California Gov. Gavin Newsom gestures during an interview in Sacramento, Calif. The Democrats who rule California took on homegrown tech giants Uber and Lyft over their work force, convinced some of the world's biggest automakers to buck the president on fuel emissions and passed a law that could change college sports. On issues big and small, hotels soon will be forbidden from providing guests with little plastic shampoo bottles, California this year has marched farther left and tried to pull the rest of the country with it. (AP Photo/Rich Pedroncelli, File)

FILE - In this Nov. 8, 2018, file photo, a lead pipe, left, is seen in a hole the kitchen ceiling in the home of Desmond Odom, in Newark, N.J. The Trump administration is proposing a rewrite of rules for dealing with lead pipes contaminating drinking water, but critics say the changes appear to give water systems decades more time to replace pipes leaching dangerous amounts of toxic lead. Contrary to regulatory rollbacks in many other environmental areas, the administration has called dealing with lead contamination in drinking water a priority. (AP Photo/Julio Cortez, File)

Alaska Supreme Court Justice Craig Stowers listens to arguments in a lawsuit that claims state policy on fossil fuels is harming the constitutional right of young Alaskans to a safe climate Wednesday, Oct. 9, 2019, in Anchorage, Alaska. Sixteen Alaska youths in 2017 sued the state, claiming that human-caused greenhouse gas emission leading to climate change is creating long-term, dangerous health effects. They lost in Superior Court, but appealed to Alaska's highest court. (AP Photo/Mark Thiessen)