高中英语人教版选修6Unit4 Global warming Reading 18张PPT.ppt

The earth is becoming warmer but does it matter?,Learning aims: Learn some knowledge about the greenhouse effect and global warming. 2) Know the contents of the text well by talking about this topic and reading. 3) Discuss the problem of global warming and express your own opinions.,The natural greenhouse effect makes the earth _ for human beings to live in and it is _ to us. It is the _ greenhouse effect that causes the global temperature to _.,suitable,beneficial,man-made,go up,From the graph, we can see that during the 20th century the temperature of the earth rose about one degree Fahrenheit.,All scientists subscribe to the view that the increase in the earths temperature is due to the burning of fossil fuels like coal, natural gas and oil to produce energy.,More such burning means more carbon dioxide added to the atmosphere.,Between 1957 and 1997 the carbon dioxide in the atmosphere went up from around 315 parts to about 370 parts per million.,Global warming,The effects will be terrible!,We should not worry about it!,Read the text on page 26 to find more about the two different viewpoints towards the effects of global warming between Dr. Foster and George Hambley.,Dr. Foster Carbon dioxide has caused the global temperature to _. An increase of five degrees would be a _ and could be very _.,go up,catastrophe,serious,The sea level to rise,The glaciers of the Poles to melt,floods,Severe storms,droughts,famines,the spread of diseases,the disappearance of some species,George Hambley,Any warming will be _ with few bad _. More carbon dioxide is a _ thing, which makes crops _ more and will encourage _.,positive,produce,a greater range of animals,mild,environmental consequences,Discuss the statement: We should take immediate action about global warming. (Write down your reasons and your measures on your learning sheet.),Assignment:,Make up a complete composition in