ENV221H1 Lecture Notes - Lecture 16: Iucn Red List, Anthropocene, United Nations Environment Programme
Document Summary
Fossil records suggest more than 99% of all species ever in existence are now extinct. Most extinct before human arrived, so it might just be a natural phenomenon. End of cretaceous: dinosaur and 50%existing animal disappeared. Definition: elimination of species (dna wiped out) Normal process: background annual extinction rate : 1 extinction per 1 ~ 10 million species. In the centry, humane mpact have accelerated this rate, causing perhaps hundreds to thousands times more than background rate. List of species facing high risk of extinction. Y axis - index of survival : 1 = good, lowe= wrode. 1. trees are in biggest threat of ecrin tion. 2coral suffer the largest change in extinction: living planet index(lpi) Recognzed that biodiversity loss is more than just extinctions. There is also decline in popluation and geographid range. Summarize trends in popluation of other 25,000 vertebrate sperice. Identify which species is most like at risk. Wwf reported a decline of 60$ in world wildlife.
