Miami Herald: If anyone needs a reminder of the on-the-ground impacts of global climate change, come to the Andes mountains in Bolivia . At 17,388 feet above sea level, Chacaltaya, an 18,000 year-old glacier that delighted thousands of visitors for decades, is gone, completely melted away as of some sad, undetermined moment early this year. “Chacaltaya has disappeared. It no longer exists,” said Dr. Edson Ramirez , head of an international team of scientists that has studied the glacier since …