IBT阅读材料：海洋污染Ocean pollution.pdf

智 课 网 托 福 备 考 资 料 IBT阅读材料：海洋污染Ocean pollution 近期英国石油公司油井爆炸事故已经在美国墨西哥湾海域造成了巨 大的污染，无数海洋生物和周边生活的人们遭受痛苦，人们也再次意识 到保护海洋生态环境的重要性。而1998葡萄牙里斯本世博会的主题就是 ：海洋 -- 未来的财富，海洋污染让人心痛!   More oil from land than from spills   Oil spills cause huge damage to the marine environment - but in fact are responsible for only around 12% of the oil entering the seas each year. According to a study by the US National Research Council, 36% comes down drains and rivers as waste and runoff from cities and industry.   Fertilizer woes   Fertilizer runoff from farms and lawns is a huge problem for coastal areas. The extra nutrients cause eutrophication - flourishing of algal blooms that deplete the waters dissolved oxygen and suffocate other marine life. Eutrophication has created enormous dead zones in several parts of the world, including the Gulf of Mexico and the Baltic Sea.   Seas of garbage   Solid garbage also makes its way to the ocean. Plastic bags, balloons, glass bottles, shoes, packaging material - if not disposed of correctly, almost everything we throw away can reach the sea.   Plastic garbage, which decomposes very slowly, is often mistaken for food by marine animals. High concentrations of plastic material, particularly plastic bags, have been found blocking the breathing passages and stomachs of many marine species, including whales, dolphins, seals, puffins, and turtles. Plastic six-pack rings for drink bottles can also choke marine animals.   This garbage can also come back to shore, where it pollutes beaches and other coastal habitats.   Sewage disposal   In many parts of the world, sewage flows untreated, or under-treated, into the ocean. For example, 80% of urban sewage discharged into the Mediterranean Sea is untreated.   This sewage can also lead to eutrophication. In addition, it can cause human disea