MEA 100 Lecture Notes - Lecture 20: Sandra Postel, Watt, Water Cycle
31 Jan 2019
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Document Summary
Sandra postel directed the independent water policy project. Water shortages are leading to economic disruption. Our decisions on water use may determine the survival of most of the planet"s species, Climate change is altering water cycle between sea, atmosphere, and land. Floods, droughts start farmers from growing crops and cause famine. The 500 billion worth of annual global investments in dams, flood control systems, In australia it is no longer a question of when the drought will end, but how can we adapt. Scripps institute of oceanography at the university of california estimates a 50% In 2000 lake mead will have 96% water left, 2009 43% Most of earth"s water is in oceans and too salty to use. Between 1950 and 2009 global renewable water supply per person declined by 63% China has 19. 5% of global population, but only 7% of renewable fresh water. The u. s. has 4. 5% of global population and 8% of renewable fresh water.
