Unit 9 Saving the earth

教学目标 : Ⅰ. 观看图片演示, 分析讨论并讲述人类面临的水污染, 垃圾污染, 空气污染, 乱砍滥伐, 土地沙化等环境问题, 讨论内容包括以下问题 : ① What kind of environment problem is it? ② How does it form? ③ How deal with it? Ⅱ. 教育学生认识到环境问题从身边、学校、家庭的小事做起, 从自身做起, 讨论并回答以下问题 : ① What kind of pollution are there in Our school? ② What should you do? Ⅲ. 掌握 : do sb. harm=do harm to sb. 拓展 : ① do sb. good=do good to sb. do sb. wrong=do sb. to wrong do sb. a favour=do a favour for sb. ② be harmful to

Water pollution

Waste from factories and cities should be stopped from throwing into the water.

Picture 1 factories water pollutionfrom families lead to farms people become sick using new fish die stop technologies plants die recycling making clean

Picture 2 Products wrapping Trash/Garbage from factories lead to Families ① using baskets to buy Water pollution products Air pollution stop ② don ’ t throw rubbish Make people sick or nature Spread diseases ③ recycle

Air pollution

picture 3 Traffic: buses, cars… Air pollution from factories ， smoke, chemicals. Lead to Rubbish Acid rain Making people sick using less energy Animals/plants killing stop plant new trees and grass or make them die out using less wood bringing nature disasters prevent factories bringing pollution

deforestation

Picture4: Cutting down trees Deforestation from met plant new trees lead to Use too much wood Climate becomes worse and worse don’t cut too many trees Soil washed away by blood stop plant new trees or brown away by strong wind don’t use too many wood desert appears Sandstorm

desertification

too many sheep and cattle all the grass be eaten up grass never grow again ; the land become desert

nothing to hold… soil be blown away soil be washed into…

Picture 5 ： Desertification lead to Deforestation Soil washed or blown away lead to desert /sandstorm

Help

Help me,help you, help everyone. Return GREEN to the earth!

As a result,more people will die of hunger.

Picture 6 ： We can draw a conclusion Water pollution no clean water Trash/Garbage no fresh air Air pollution lead to no soil Deforestation more plants and animals Desertification die out No living place Lead to starvation （ even death ）

We have only one earth !!!

Summary We can see from the pictures our earth facing different kinds of harms. if we don’t protect our environment and continue to destroy it, we will destroy ourselves. As middle school students, we must realize that protecting our environment is everyone’s duty.so we must study hard and improve our quality to make our and better. That is, we can make our life better and better.

Discuss and answer the following questions ① What kinds of pollution are there in our school? (plastic bags, plastic bottles, wrapping packages; waste paper and so on) ② What should we do? (put them into the rubbish bins/put together to sell them /Don’t throw them in the school yard or in the classroom /we should be strict with ourselves )

Main points ① do sb. Harm/ good/ wrong/ a favour= do harm / good/ wrong/to sb do a favour for sb. ② be harmful to

Homework Write a short passage about how to protect our environment