GlobalWarming.ppt

,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,Globe Warming,Is waiting for or to change the destiny?,Background,In recent years,global warming is mentioned more often by scientists.It causes many problems and affects peoples normal life,now has become one of the worst problems confronting human beings.,Global warming,is the increase in the average temperature of the Earths near-surface air and oceans since the mid-20th century.,Global warming is a period of time,the earths atmosphere and ocean temperatures phenomenon,is mainly refers to man-made temperature to rise.,The current world range that the main reason is quite likely the due to greenhouse gases(carbon dioxide on behalf of gas emissions caused by too much.,Nearly 100 years,the average global temperature experienced:cold,warm and cold and warm four wave,in the overall look at the temperature for a rising trend.In the eighty s,global temperature rise significantly.,What is global warming?,With the development of economy,more and more greenhouse gases are being discharged into the air.CO2 makes up about 70%of the greenhouse gases,which is considered to be one of the greatest causes of global warming.,全球变暖指的是在一段时间中，地球大气和海洋温度上升的现象，主要是指人为因素造成的温度上升。目前世界范围内认为主要原因很可能是由于温室气体（代表气体二氧化碳）排放过多造成。,近,100,多年来，全球平均气温经历了：冷暖冷暖四次波动，总的看气温为上升趋势。进入八十年代后，全球气温明显上升。,What are the causes of the globe warming?,工业废气的排放,The main reason is the excessive carbon dioxide emissions.,Plant damage,The effects of global warming can have many unforeseen side effects.,全球变暖带来许多不可预料的影响。,The dangers of global warming,Where is my home?,As the temperature rise,the earths poles(,极点,)island fate snow melt can lead to rising sea levels,many islands will be drowned,some island may not exist.,咦！这冰怎么就慢慢融化了呢？看来此地不宜久留呀！,if the earths average temperature 4 degrees Celsius,the world will have more than 30 million people water shortages.,如果地球平均气温上升,4,摄氏度，全球就会有,30,多亿人面临缺水问题。,Yes,our earth is heating up.What can we do.,We can use more clean energy sources,such as wind,solar,etc.If every family can use energy-saving lamps,and so will save more resources.,We should plant trees a lot,because the green plants can change carbon dioxide into oxygen.,Let us start from now,save energy and protect the environment,protect our survival homeland.,Thank you!,