新课标高中英语选修6第四单元阅读课件.pptVIP

Coal Oil Natural gas Uranium (nuclear energy) Wind (wind power) Sun (solar energy) Water (hydro-electric power) Plant waste (biomass energy) Hot springs or geysers (geothermal energy) The sea (tidal energy) Fossil Fuel(矿物燃料) Para.2 1.What conclusion can you make from the Graph1? The earth is becoming warmer. 2.Who is to blame for the earth’s becoming warmer? It is human activity that has caused this global warming rather than a random but natural phenomenon. 3. What is greenhouse effect? It is a natural phenomenon which happens when small amounts of gases in the atmosphere, like carbon dioxide, methane and water vapour, trap heat from the sun and therefore warm the earth. 4. What kind of problem does it begin when huge quantities of extra carbon dioxide into the atmosphere? It means that more heat energy tends to be trapped in the atmosphere causing the global temperature to go up. Para.5 1. Do the scientists accept the data? They accept the data and agree that it is the buring of fossil fuels that had resulted in this increase in carbon dioxide. 2. How high will the temperature increase go? Dr Janice Foster says that the amount of warming could be as low as 1 to 1.5 degree Celsius, but it could be as high as 5 degrees. What do Dr. Janice Foster and the scientist George Hambley think about the results of global warming? Do they agree with one another? Does global warming matter? Para.7 1. What do we actually do now and what will happen to the climate? We donot start reduing the amount of carbon dioxide. The climate is going to keep on warming for decades and centuries. 2. What about the effects of global warming? No one knows. Does that mean we should do nothing Or,are the risks too great? Tip: You can know somebody’s opinion through understanding his or what he said. quotations(引言) Para 6 Dr. Janice Foster thinks the effects of global warming could be very serious. George Ha