Alaska Public Media: In a wing of the Mendenhall Glacier Visitors Center a small crowd of onlookers is watching a debate between a man and an employee. The tourist is wearing a floppy hat and red shirt. And hes leaning on a silver tipped cane as he listens waiting for a chance to respond. Kat Pratt is a ranger and interpreter. She was delivering talking points on sea level rise when the man who didnt want to give his name challenged her. He thinks rising temperatures are cyclical. Not caused by people. And...