新建精读MicrosoftPowerPoint幻灯片2(免费阅读).ppt

The enviroment crisis in the world 1.the situation of enviroment crisis 2.the cause of enviroment crisis 3.types of enviroment crisis The sea level to rise water pollution Global Warming Issues Explanation of the effects of global warming Global Warming Issues International effort Common responsible 责任共担UNCCC National efforts. Change policies National research activities Improved ability to forecast Biological crisis Nuclear pollution Nuclear pollution is produced by nuclear explosion which are carried out for performing nuclear tests and which is used for making nuclear weapons. The effect of nuclear * situations the environment becomes worse and worse 1.The sea level to rise 2.the spread of diseases 3.changing climate 4.Water pollution ,air pollution, ocean pollution, becomes worse and worse water pollution air pollution ocean pollution causes 1.a huge population pressure 2.irrational utilization of natural resourse 3.one-side pursuit of economic growth rate types 1.the environment pollution water pollution air pollution noise pollution ocean pollution 2.Global Warming Issues 3.Ecological Problems 4.Nuclear pollution global warming, the gradual increase of the temperature of the earths lower atmosphere as a result of the increase in greenhouse gases since the Industrial Revolution effects 1.leading to a quarter of animals and plants on the land dead 2.rising sea levels, and decreasing snow cover in the Northern Hemisphere(半球). 3.the destruction of species 4.leading to glacier thaw(融化) and some place droughts Alaska 1914 2004 Photos: NOAA Photo Collection and Gary Braasch – WorldViewOfGlobalWarming.org Reason:(1) Human activities The burning of fossil fuels化石燃料 Industrial emissions工业排放 electricity generation发电 Transportation (2)Deforestation森林砍伐 water vapour(H2O), carbon dioxide(CO2), methane(CH4), nitrous oxide(N2O), Accelerated greenhouse effect The United Nations Climate Chan