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1、Global Warming,1.What is global warming?,The increase in the average temperature of the earths atmosphere and oceans in recent decades.,2.What Lead to Global Warming?,Greenhouse Gases:carbon dioxide,methane（甲烷）,nitrous oxide（氧化亚氮）,2.What Lead to Global Warming?,Explosive PopulationGrowth,3.What chan
2、ges does it cause,Ice Melting:ice cap,glacier,permafrost,3.What changes does it cause,Increased Hurricanes and Other Disastrous Weather,3.What changes does it cause,Cyclone,3.What changes does it cause,Sea Level Rising:intense storms,beach erosion,land loss,salty sea water intruding into underground water,3.What changes does it cause,4.What should we do,Global warming is the greatest environmental challenge in the 21st century.-Albert Gore,4.What should we do,Cut-down on our demand for electricity.Decrease the use of cars.Follow the environmental policy:Reduce,Reuse,Recycle.,
