Berkeley ENVECON 153 - Population and Biodiversity (10 pages)

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Population and Biodiversity



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Population and Biodiversity

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Pages:
10
School:
University of California, Berkeley
Course:
Envecon 153 - Population, Environment, and Development
Population, Environment, and Development Documents

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Population and Biodiversity What is biodiversity Population biodiversity hotspots from Nature s Place Cincotta Engelman Pop Action Int l Main causes of loss in biodiversity People parks and biodiversity Protecting biodiversity through protected spaces and informed management EEP153 spring 2005 Population and Biodiversity Biological diversity the variability among living organisms from all sources including inter alia terrestrial marine and other aquatic ecosystems and the ecological complexes of which they are part this includes diversity within species between species and of ecosystems Convention on Biological Diversity Rio 1992 Biodiversity benefits for humankind Consumption goods seafood timber pharmaceuticals Life support processes water purification and storage removal of carbon dioxide air filtration pollination pest flood landslide control Life fulfilling conditions existence values beauty appreciation recreation Conservation of options option values genetic diversity for food and health of future generations Estimated total economic value of the biosphere s natural ecosystems 33 trillion dollars annually 1 8 times the entire world s GNP An interesting benchmark Constanza R Nature May 1997 EEP153 spring 2005 Population and Biodiversity Today s problem unprecedented loss of species due to human activity that degrades habitat and creates pollution Estimated total number of species today 10 million Background rate of extinction 1 to 10 extinctions each decade estimated rate of extinction over the last century 100 to 10 000 species per year 1 4 of all mammals 1 10 of all birds 1 3 of all fish at risk of extinction If only 10 of each type of natural habitat eventually remains considered optimistic around 50 of all species are projected to survive EEP153 spring 2005 Population and Biodiversity 25 Global Biodiversity Hotspots 25 regions of the world where terrestrial biological diversity is most concentrated and the threat of loss most severe 12 of Earths s land



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