The city and county of San Diego are doing something the United States and most of the world’s most powerful nations have not: committing to net zero carbon emissions by 2035. That’s the same year Gov. Gavin Newsom’s ban on gas-powered automobiles sales in California fully kicks in. The governor also has taken action to prohibit new permits for fracking and greatly restricting where new oil and gas drilling can take place. Those are things the U.S. and many big countries have not done, either.