Unit4　LanguageStudy精品课件（新人教选修6）.ppt

新课标人教版课件系列;Language Study ;A sample poster;;Discovering useful words and expressions (P28);1. Charles Keeling collected ______on the carbon dioxide content in the atmosphere over a forty-year period. He found that the amount of carbon dioxide _______ increasing during that time.;2. Although we are burning coal in huge _________ every year, we wont ________ of it for centuries. 3. If the amount of greenhouse gases continues to _______ we could be facing a global __________ .;4. Many scientists believe that global warming has __________ through the burning of fossil fuels. They do not think that ignoring the issue is worth the ____ .;6. The _____________ of a rising sea level would be widespread flooding. 7. The use of energy in Susannas country is low ______________ the use of energy in the USA. ;8. The warming of the earth is a _____________ that causes great concern. 9. The ________ shows temperature changes during the 20th century. 10. One hectare of forest can absorb 23 tons of carbon dioxide ____ year.; Look at the two graphs on page 26. Then complete the paragraphs about them with appropriate words. The first graph shows the global ____________ between ______ and _____ . ; The temperature _________ and decreased over this period but on the whole it ______ by around one degree Fahrenheit. During this time, the earth reached its ______ temperature in about _____ and its highest in 2000. ; There was a steady _______ in the temperature during the twenty years after 1980. We can see from the graph that the earth has become ________ since early last century. The second graph shows the amount of_____________ in the; atmosphere from _____ to _____ . The carbon dioxide _______ steadily over this forty-year period. It went up from 315 to 370 parts ____ million.; Complete the sentences below with the correct word. Use a new word made from a word on the left and a suffix on the right.;1. Those factories are causing a lot of ________ with al