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Satellite image of the aral sea in the year 2003

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Unformatted text preview: 1950; volume is less than 25%. Climate in the area has become more extreme; dust, contaminated with pesticides and heavy metals, is blown as far as Pakistan, China, and the Arctic. Kazakhstan and Uzbekistan signed treaties to try to save the Aral Sea in 1992 and 1994. The crisis continued. In 2003 the Kazakh government announced a plan to build a dam to raise the water level of the North Aral Sea and reduce its salinity; the South Aral Sea would be abandoned. Satellite image of the Aral Sea in the year 2003 http://news.bbc.co.uk/1/hi/sci/tech/3846843.stm 81 Saving the North, Killing the South 82 Land Pollution We could talk about a number of “land pollution” problems – loss of farmland; soil erosion; salinization, etc. Instead we are going to focus on one aspect of land pollution: solid waste disposal. In the summer of 2005 the Kok Aral dam, funded by the World Bank to save the northern part of the Aral Sea, was completed. Since then the northern region has started to fill up – and even more quickly than expected. – “Solid Waste” refers to trash and garbage — not sewage! Americans throw away more trash per person than any other people on earth — about 1,600 pounds per person, per year. http://earthobservatory.nasa.gov/Newsroom/NewImages/images.php3?img_id=17241 83 Municipal Solid Waste 2007 http://www.epa.gov/epawaste/nonhaz/municipal/pubs/msw07-fs.pdf 84 What’s in the trash? http://www.epa.gov/epawaste/nonhaz/municipal/pubs/msw07-fs.pdf 14 85 Methods of Waste Disposal 86 Dumps (the not sanitary landfills) There are four methods of solid waste disposal that are used today: – – – – DUMP (“landfill” – obsolete in the US) SANITARY LANDFILL INCINERATION RECYCLING A village dump in rural Alaska. Because the land here is frozen (permafrost), it is impossible to construct a landfill here. US Census Bureau, Statistical Abstract of the United States, 2000; http://roomfordebate.blogs.nytimes.com/2010/04/13/should-the-u-s-burn-or-bury-its-trash/...
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