高中英语Unit 4 global warming (ppt)课件必修六新人教版.ppt

* Module 6 Unit 4 Reading The Earth is Warming－But does it matter？ (2nd period) How did come about? the snow catastrophe Global warming was one of the important reasons why such extreme climate like severe storms and heavy snow frequently came about. 孙广勇 造成极端天气频繁的一个重要原因就是全球变暖。 global warming THE EARTH IS BECOMING WARMER－ BUT DOES IT MATTER？ the cause Greenhouse effect is a natural p . Greenhouse gases in the atmosphere can warm the earth by trapping heat energy. But the problem begins when we add huge q of extra carbon dioxide to the atmosphere by burning fossil f . Therefore, more heat energy is t in the atmosphere. It is the increased amount of carbon dioxide that is r in global warming. Fill in the blanks with the proper words according to the first letters given. henomenon uantities uels rapped esulting huge quantities of Huge quantities of CO2 are added to the atmosphere. Huge quantities of fossil fuels are burned to produce energy. As a result of burning fossil fuels, a large of carbon dioxide ___ added to the atmosphere. A. number; is B. quantity; is C. number; are D. quantity; are Compared to ten years ago, the carbon dioxide content over this decade has gone up rapidly. Carbon dioxide in the atmosphere is compared to the glass of greenhouse. 1957 1970 1990 340 2000 350 360 370 Graph: CO2 content in the atmosphere, 1957-1997 year parts per million Compared with is similar to 人们经常把老师比做园丁. People often __________ teachers _____ gardeners. That probably doesn’t sound very much to you or me but it is a rapid increase (与大多数的自然变化相比) . compared to most natural changes compare to The rapid increase in global temperature would result in serious consequences. Serious conseq