November 6.docx

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University of North Carolina-Wilmington
Environmental Studies
EVS 205
James Rotenberg

November 6, 2013 Global Water Issues • Safe Drinking Water o 783 million people do not have access to clean water o 2.5 billion do not have access to adequate sanitation o 1 in 9 people worldwide do not have access to improved sources of drinking water o 1 in 3 lack improved sanitation • Cuyahoga River in Ohio o Pollution caused river fires in 1950s and 1960s Global Water Pollution in Rivers, Lakes, Groundwater, and Oceans • Pollution: Freshwater Lakes o Lakes and reservoirs are more susceptible to runoff contamination than rivers o Eutrophic  Nutrient rich (nitrates and phosphates)  Poor light penetration  Low dissolved oxygen  Shallow  High algae growth o Oligotrophic  Nutrient poor  Good light penetration  High dissolved oxygen  Low algae growth o Eutrophic Blooms  Nutrient overload produces blooms • Algae and or/cyanobacteria  Algae die – decomposing bacteria multiply • Causes DO levels to drop 2 • Ex: Greenfield Lake • Water Pollution can contribute to: o Bioaccumulation  Toxin is absorbed and stored in specific organs or tissues at higher than expected levels. o Bio-magnification  Toxin levels are increased as they pass through food chains
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