Water crisis

Water crisis - The Global Water Crisis and What We Can Do...

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mgb-eat1 The Global Water Crisis … and What We Can Do About It
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mgb-eat1 Outline The Global Water Crisis – Scarcity Amidst Plenty The Canadian Situation Contributory Factors Policies and Technologies
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mgb-eat1 The Global Water Crisis Water – A Renewable resource; But … Only 2.7% of water on earth fresh; only 0.01 % fresh and accessible Freshwater ecosystems under threat from human impacts Water tables falling; rivers running dry; large lakes shrinking; wetlands reduced 50%; 20% freshwater fish close to extinct Water demand has tripled over 50 years Large dams – 5000 (1950) to 45,000 (2 dams per day) Nitrogen fertilizer use has grown eight-fold The Story of the Aral Sea … but also Spain, Australia Water wars ??
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mgb-eat1 The Global Water Crisis Water unevenly distributed globally – six countries account for 50% of freshwater supply – but also within countries Canada 92,000 cu.m. per capita; Jordan, Israel 130; China – 21% of population, 7% of fresh water, north-south divide Vast differences in water withdrawals, but for different reasons -- USA vs. Egypt ( Chart ) Natural abundance doesn’t mean access; scarcity doesn’t mean deprivation; wealth vs. poverty – Phoenix, AZ vs. Ethiopia, Indonesia Water scarcity hits the poor the hardest; 1 in 5 lack “reasonable access” – 20 L/day within 1 km; 1 in 3 lack basic sanitation Not a matter of scarcity – ensuring 50 L/day for all would require merely 1% of global withdrawal
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mgb-eat1 The Global Water Crisis Country Annual withdrawal Cu.m. per capita Ethiopia 42 Brazil 348 China 491 Germany 574 France 675 Spain 893 Egypt 1011 Australia 1250 USA 1932 Source: Postel, 2000
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mgb-eat1 The Global Water Crisis -- Factors Population and consumption pressures Land conversion and degradation Groundwater withdrawal River diversion, dam and levee construction Pollution Climate change
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This note was uploaded on 03/23/2012 for the course ENVR 201 taught by Professor Badami during the Fall '08 term at McGill.

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Water crisis - The Global Water Crisis and What We Can Do...

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