保护环境_专业英语ppt.ppt

What does our earth look like? How is our living environment? 1010741127徐洋洋 Everybody knows waste paper and used coke cans are discarded everywhere. You might have seen plastic bags flying in the sky and getting caught in the trees when the wind blows or maybe you have seen old cans floating in the rivers and polluting the water. Our environment is the place in which we live, but it is being ruined by us. Air pollution is becoming a severe problem,which mainly caused by transport action and factories production. The air pollution changes the conditions that we depend on, such as the greenhouse effect and the acid rain. It causes many diseases,too. Water pollution is the contamination of water bodies such as lakes, rivers, oceans, lagoons, and groundwater. All water pollution affects organisms and plants that live in these bodies of water and in almost all cases the effect is damaging either to individual species and populations but also to the natural biological communities. It occurs when pollutants are discharged directly or indirectly into water bodies without adequate treatment to remove harmful constituents. The globle warming Increasing global temperature will cause sea levels to rise and will change the amount and pattern of precipitation, including an expanse of the subtropical desert regions. Other likely effects include increases in the intensity of extreme weather events, changes in agricultural yields, modifications of trade routes, glacier retreat, species extinctions and increases in the ranges of disease vectors. ? A large number of forests have been sacrificed for urban development.? As we all know, trees are able to help clean the air.? Furthermore, we are killing animals while cutting down these trees.? As a result, many animal species are dying out.?Air pollution is getting worse,which can cause many diseases.? people still go on cutting down trees. What does our