Salt Lake Tribune: Utahns have heard it before: Climate change threatens to make water more scarce. It will shrink the ski season, and swell the demand for summertime air conditioning. But there are new messages for the Southwest in the White House report on climate change released Tuesday: Powerful changes are under way already and the time to act is now. “Recent warming in the Southwest has been among the most rapid in the nation,” says the opening line describing the region’s climate impacts. …