EESA10H3 Chapter Notes - Chapter 7: Taxus Brevifolia, National Cancer Institute, Paclitaxel
8 May 2019
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Document Summary
Human health and the environment chapter 7. Extinction of species most destructive and permanent of all assaults on the global environment since it is irreversible. Replacing species (ie. for recovery following mass-extinction events) create new ones and that the unique information encoded by the dna of the lost species is gone forever. Motivating forces to alter behaviour include: spiritual, ethical, aesthetic values and economic factors. Human activity has resulted in species extinction rates that are currently 100 to 1000 ties those of pre human levels (homo sapiens evolved some 120 000 years ago) Ehrlich and wilson and other have predicted that a quarter or more of all species now alive may become extinct during the next 50 years. Biologists refer to this period as the sixth extinction . Biodiversity: the total complement of different living organisms in an environment: threatened by climate change, ozone depletion, chemical pollution etc.
