可持續(xù)發(fā)展經(jīng)濟ppt介紹之循環(huán)經(jīng)濟講解environment(編輯修改稿)
2025-02-11 12:26 本頁面
【文章內(nèi)容簡介】 Most developed countries have reduced point source pollution, but toxic chemicals and pollution from nonpoint sources are still problems. Stream pollution in most developing countries is a serious and growing problem. Half of the world’s 500 major rivers are heavily polluted, and most of them run through developing countries where waste treatment is minimal or nonexistent. For example: Religious beliefs, cultural traditions, poverty, little economic development, and a large population interact to cause severe pollution of the Ganges River in India. 11 Pollution of Lakes 12 The Great Lakes Fig. 228 p. 500 13 Groundwater Pollution: Causes ? Low flow rates ? Few bacteria ? Cold temperatures Coal strip mine runoff Pumping well Waste lagoon Accidental spills Groundwater flow Confined aquifer Discharge Leakage from faulty casing Hazardous waste injection well Pesticides Gasoline station Buried gasoline and solvent tank Sewer Cesspool septic tank Deicing road salt Water pumping well Landfill ? Low oxygen 14 Pollution of Groundwater Experts rate groundwater pollution as a lowrisk ecological problem。 it is rated as a highrisk health problem. The extent of groundwater contamination is generally unknown Prevention is the most effective and affordable way to protect groundwater from pollutants. 15 Ocean Pollution Fig. 2211 p. 504 16 Case
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