绿地球环保主题.pptVIP

一 land utilization border line：Not more than 15% of the permafrost area are used to grow grain. At current levels：12% The diagnosis：The middle of the century may have more than the critical value. remarks：The expansion of agriculture is the greatest enemy of ecosystem, another way of land use is also very important. other：Losing fertility overgrazing and so on Pictures show Pictures show 二 climatic variation border line：Atmospheric carbon dioxide concentrations less than 350 PPM. Before the industrial revolution：280PPM At current levels：380PPM The diagnosis：exceeding the cordon remarks：History proves that carbon dioxide is the main reason to atmospheric temperature control, and the consequences of more than 350 PPM is slowly emerging. other：The global problems of ozone depletion greenhouse warming and so on Pictures show Pictures show 三 Human activities inexhaustible Rational consumption PM2.5 Call on：The sustainable development Pictures show Pictures show 四 On the verge of biological The diversity of life on earth is high speed dropped, faced with the threat of extinction of many specie reason： Pictures show Pictures show conclusion The roots of environmental damage run deep.Unless they are unearthed soon,we risk exceeding the planets carrying capacity to such a degree that a future of econmic and social decline be impossible to avoid. conclusion LOGO 11.4 0 11.4 Environmental Protection Carrying Capacity:Earths Bottom Line Institute of tobacco LiuYa Huang 2015210373 一 land utilization 二 climatic variation 三 Human activities 四 On the verge of biological 目 录 1 Habitat loss 2 Business development 3 The international trade of wildlife and its products Protecting the environment is everyones responsibility LOGO