 NPR's Asma Khalid reporting. An extremely dangerous heat wave persists in several western states. Forecasters say temperatures could skyrocket to 120 degrees or more in some parts of Arizona, California, and Nevada. At least a dozen western cities have broken heat records in the last week. And NPR's Julia Simon reports scientists see a clear connection to climate change. When Joe Paschal moved to Palm Springs, California about 17 years ago...