北师大版Unit22.Lesson1Global Warming阅读课件

1、Lesson 1 Global WarmingEnvironmental problems?air pollutionglobal warmingendangered animalswater pollutionsoil pollutionsandstormforestation noise pollutiondesertification http:/ What do you know about global warming?BrainstormingRaising the Earths temperature will cause substantial melting of the p

2、olar ice caps which will then lead to a rise in the sea level and subsequent flooding of low-lying areas.Global warming will also change countries climates and cause huge food and water shortages. Most environmentalists agree that global warming is an unnatural phenomenon caused by the emissions fro

3、m burning carbon fuels such as coal, oil and petrol; they call this the “greenhouse effect”.There have been several summits of governments to discuss this problem but many countries dont want to make changes to their factories and industrial works as this would cost them money.Which countries do you

4、 think contribute more to global warming?a) developed countriesb) developing countriesDeveloped countries more industry and technology.Part IIPre-readingGuessing: Based on the title and the following pictures, can you guess whats the meaning of the word “take”? Pre-readingQuestion: What is global wa

5、rming?Global warming means an average increase in the Earths temperature which leads to climate change.While-reading: SkimmingRead the text and find main idea of each paragraph.A. Draw readers attention to the topic by asking questions. B. What should human beings do. C. What is global warming. D. C

6、onsequences of global warming. E. What cause global warmingPara 1.Para 2.Para 3.Para 4.Para 5.While-reading: Skimmingconsensus, bounce, agriculture, coincidence, condemn, reservation, sacrifice, advocateScan the text below for these words and work out their meanings.Scanning:Scan the text below for

7、these words and work out their meanings.consensusbounceagriculturecoincidencea remarkable concurrence of events by chancemove quickly up, back, or away from a surface after hittinga general agreementthe science or practice of farmingcondemnreservationsacrificeadvocatethe action of reserving somethin

8、g to recommend or support publiclyto give up (something important or valued) because of other considerations sentence to a particular punishment, especially death 1. What human activities are causing global warming? 2. By how much has the global average temperature increased in the last 100 years? 3

9、. Are greenhouse gases necessary for life on Earth? 4. How can we help solve the problem of global warming?Read the text and answer the questions.1) What human activities are causing global warming?Industry, agriculture, the cutting down of forests, the increase in transport and the burning of fuels

10、 are causing global warming.2) By how much has the global average temperature increased in the last 10 years?By 1F ( one degree Fahrenheit).3) Are greenhouse gases necessary for life on Earth?Yes, they are, because they trap heat from the sun in the Earths atmosphere. Otherwise the Earth would be co

11、ld and unsuitable for life.4) How can we help solve the problem of global warming?We can make small changes like taking public transport, recycling, using low-flow shower heads, and buying energy-efficient light bulbs to help stop global warming.Post reading: Group workVoice your opinions:What will

12、you do everyday to help reduce greenhouse gases?Examples The recycling symbolbuy the recycled productsPost reading: Group workVoice your opinions:What will you do everyday to help reduce greenhouse gases?Post-reading: vocabularyUse the expressions in the box in the correct form to complete the sente

13、nces.1 Water was the fish pond from the river.2 We all need to to finish in time!beyond our control, pump into, as a result of, in large quantities, refer to, speed up3.There is nothing more we can do .the situation is now .4. the accident, she is now afraid of water.5. The scientist global warming at least three times in his speech.6. The factory was producing