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1、Unit 4 Global WarmingSave the earth!THE EARTH IS BECOMING WARMER BUT DOES IT MATTER?Put forward a problem global warmingHow does this come about？（？（causes）Does it matter？（？（consequences）Small amounts of gases in the atmosphere trap heat from the sun and therefore warm the earth.Part II Causes human
2、activity global warmingnWhat did the scientist called Charles Keeling find from 1957 to 1997?nWhat resulted in the increase in CO2?He found that between those years _ in the atmosphere went up _ 55 parts per million.It is thatOver the next 100years,the amount of warming would be 1degree Celsius _ an
3、d 5 degrees _ Part II(Para4-5)details 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 atmosp
4、here.It is the increased amount of carbon dioxide that is r in global warming.Part II Fill in the blankshenomenon uantitiesuels rapped esultingPart III(Para6-7)ConsequencesDr.Janice Foster thinks the effects of global warming could be very serious.George Hambley thinks global warming will be mild wi
5、th few bad environmental consequences.The author _2.Does global warming matter?ScanningPositive effects Negative effects 1.cause the sea level to rise2.severe storms3.droughts4.famines5.the spread of diseases6.destruction of speciesPositive effects Negative effects 1.make plants grow faster2.crops w
6、ill produce more3.a greater range of animals4.make life better George HambleyIdea-sharingWhat will global warming bring to us in your opinion?nWhat have you learned from the passage about global warming?nIt is said that the climate is going to keep on warming for decades or century.Do you think that
7、 we should do nothing about it or not?We should do something about global warming.Because it could have many negative effects on the earth.With the temperature increasing,the polar ice caps eventually would melt,causing sea levels to rise by several meters.Coastal and low-lying cities would be submerged.Some scientists predict severe storms,droughts,famines,the spread of diseases and the destructions of species.