A new report warns that U.S. National Parks could be devastated by global warming. Picture no bears in Yellowstone or alligators pushed out of the Everglades. The report from the Rocky Mountain Climate Organization identifies 25 national parks, lakeshores, seashores and monuments most at risk from warming temperatures, rising sea levels and retreating snow. WBHM’s Tanya Ott spoke with the group’s president, Stephen Saunders.