The Rhone Glacier pictured in 1849 is seen in this handout image released by the ETH Library Zurich. (Photo: Leo Wehrli/Verein Schweizerischer Geographie-Lehrer/ETH Library Zurich/Handout via Reuters) The Trient Glacier is seen in the Swiss Alps in Trient, Switzerland on Aug. 26, 2019. (Photo: Denis Balibouse/Reuters)