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Unformatted text preview: ISyE 4803 - Homework 1 Solutions Due: September 3, 2009 (25 points) Instructions NOTE: In answering these questions, do not copy-paste text from the articles. Use your own words. 1. (6 points) Read the article Dying for a Drink by B. Walsh, Time, December 15, 2008, 46-49. http://www.time.com/time/magazine/article/0,9171,1864440,00.html and the photo essay on World Water Crisis http://www.time.com/time/photogallery/0,29307,1724375,00.html. 1. What are the worlds two main sources of fresh water? Rain and underground water. 2. What is the current demand/supply situation regarding water available for human use? There are only 0.014% of the total amount of water in this planet that are accessible and potable, and it is not evenly distributed. There is no clear water supply for 1.1 billion people in the world. While the world population continues growing, the amount of available potable water is replenished slower than its consumption. Furthermore, the underground water is being extracted twice to four times faster than its recharge rate. We may think to use the other source of potable water, the rain, but the global warming is leading dry places to be even drier, and places with enough rain with even more concentrated rains which may become out-of-control flooding. In conclusion, the supply of potable water is decreasing, while the demand is still increasing. 3. What is the impact of water scarcity on food scarcity? Historically, the two-thirds of potable water are used for agriculture. When the amount of potable water decreases, the total amount of water needed for daily life is increasing because of population increase. Therefore, to comply with this requirement, it is neccessary to decrease other usages, for example, for agriculture. This leads to the decrease in total crops produced while the population is still increasing. This is how water scarcity leads to food scarcity....
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This note was uploaded on 11/26/2009 for the course ISYE 4803 taught by Professor Staff during the Fall '08 term at Georgia Institute of Technology.
- Fall '08