KATOWICE, Poland (AP) — As leaders attending the U.N.’s annual climate summit heard fresh warnings about the dire consequences of leaving global warming unchecked, a new issue emerged Monday as a pressing concern: how to persuade millions of workers their industry can’t have a future if humanity is to have one.Hosting the talks in the heart of its coal region of Silesia, Poland tried to set the tone for the two-week meeting by promoting the idea of a “just transition” for miners and other workers facing layoffs as countries adopt alternative energy sources. “We are trying to save the world...