Switzerland Endangered Species

Undated photo issued by the International Union for Conservation of Nature, showing European bison. Climate change is now the biggest threat to natural World Heritage, according to a report published Thursday Dec. 10, 2020, by IUCN, although it also showed the more promising revelation that populations of the European bison, Europe’s largest land mammal, have improved. (Rafał Kowalczyk/IUCN via AP)