[英语学习]英语演讲ppt定稿.pptVIP

1.Thenature’skiller---pollution 2.Human and nature  Water pollution Biological pollution Smog event and nuclear leak Electronic Waste Water pollution---- Taihu events Original appearance Look at this time what’sthis Cyanobacteria Algal bloom – the alga proliferation out of control why? Reasons： The harm Drinking water Cyanobacterial toxins induced liver health hazard Aquatic creatures of death Biological pollution ----an emerging global menace ◆ The London smog event ◆ The Soviet union Chernobyl nuclear leak The terrible city Analysis This incident was related with large amount of coal consumption. A maximum of dust concentration was 4.46 mm/m3. Sulfur dioxide concentration was six times than normal level. Results As the production of sulfuric acid It could give rise to acid fog when sulfuric acid stuck to the dust. The acid fog was the truly killer. The Soviet union Chernobyl  nuclear leak On April 26, 1986 ,the fourth nuclear reactor happened the terrible explosion.  Some radioactive debris and gas rushed to the sky about 1 km. 130 thousand residents had to evacuate power stations quickly. Analysis Workers were careless in the process of the operations. The happening site The site after that incident A large number of babies became deformative and disable 8,000 people died of many diseases related to the nuclear radiation The ending Terrible environmental pollution incident. So make efforts to protect….. Electronic Waste In China Lang Xin Background a large manufacturer and consumer of electronic appliances serious adverse impacts on the environment and human health an important waste stream in terms of both quantity and toxicity electronic equipment contains some very serious contaminants : lead(锂), cadmi