Geography 2156B Lecture 4:
10 Feb 2020
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Virtually all students of the extinction process agree that biological diversity is in the midst of its. 6th great crisis, this time precipitated entirely by man. Biodiversity loss resonates powerfully through animals ambassadors for the rest of nature. Red list (1964); the great global register of endangerment (esp: high risk of extinction in the wild") 60% of large predators n herbivores: vulnerable or (30,000+ species threatened w/ extinction) Cheetahs heading towards extinction, 90% decline since 1980. *massive loss of habitat + prey due to historic & ongoing land use change. Lions, in 1800s: 1. 2 million, 1940s: 450,000 today: 20,000. Without major changes, extinct in the wild by 2050. Example photos: the melting of ice polar bear. Elephants: 1970-2000s: 2 million less than 500,000 since 2010 (30% decline) *for largest predators n herbivores, habitat loss: driver of declines, but poaching is a huge threat. Total in africa & asia: 1992 8300, 2000: 13,000.
