With glaciers melting, sea levels rising and 2015 about to break last year’s record as the hottest year in the world since modern measurements began in 1880, California Gov. Jerry Brown arrived Saturday at the international climate summit in Paris, bringing with him business executives, political leaders and huge hopes that the trip will make a major difference. “Jerry Brown was never elected president, but he sure wanted to be,” said Larry Sabato, a political science professor at the University of Virginia. “In this sense, I guess he’s playing president. Nobody s...