GEOG 1HB3 Lecture Notes - Lecture 8: Anthropocentrism, Passenger Pigeon, Peregrine Falcon
22 Oct 2012
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Document Summary
Human environment relations a fundamental theme in human geography. Environmental movement product of social change in 1960s; silent. Where: i = impact (on earth"s resources, p = population, a = affluence, t = technology. Many factors affect relationships amongst these variables. Human impacts: the range of effects and consequences of human activity on the environment. Impacts include: pollution; habitat destruction; climate change; resource depletion; species extinction; desertification; etc. Extinction natural part of evolutionary change. Biological resources can diminish due to: 1. Estimated 99% of species that have ever existed are now extinct. Natural causes of extinction: species evolve due to mutation, isolation, natural selection, mass extinctions due to widespread catastrophic effects of natural events, e. g. , 65 million years ago, end of cretaceous era and extinction of dinosaurs. Human causes of extinction human induced biological resource depletion (holocene: (i) direct destruction e. g. , hunting, gathering, overharvesting (cod fishery); animal products (elephants ivory) predator/pest control (coyote, wolf, (ii) indirect effects of human actions.
