人教版选修6 Unit 4 Global warming Warming-up and Reading 课件(共19张PPT)

课件19张PPT。Words studyGlobal warmingUnit 4 What is global warming?The earth is becoming warmer.2.What causes the global warming?Human activity—burning of fossil fuels Greenhouse effect—greenhouse gases Huge quantities of extra carbon dioxideOther reasons?Things that use energy around us or at any other places:In a houselights, heating, computer, hairdryer, cassette player, video recorder, CD player, Mp3/Mp4, television, fridge, Stove washing machine, air condition, micro-wave oven water heater, induction cooker video-phone盒式录音机空调微波炉电磁炉电视电话where does all the energy come from ?energy sourcesWind energy is used as power to produce electricity . Windmillswhere electricity is produced by burning coals.The coal power stationsa facility designed to convert nuclear energy into electricity.A nuclear power plantWhat’s the difference between wind power and coal power?Wind will never run out while coal is a limited source.What is renewable energy and what is non-renewable energy? Coal Oil Natural gas Uranium Wind (wind power) Sun (solar energy) Water (hydro-electric power) Plant waste (biomass energy) Hot springs or geysers (geothermal energy) The sea (tidal energy)Fossil fuelsNon-renewableRenewablePre-reading What is it in the picture? It’s a greenhouse made of glass. What is it used for? It’s used for growing plants, especially during cold weather. How does it work? The air inside is warm because the glass traps the heat from the sun and keeps it from escaping. This makes the greenhouse heat up and so the plants can grow throughout the cold period.Greenhouse effectwww.themegallery.comSkimming1.Who wrote the magazine article? 2. What is the name of the magazine? 3. What are the names of the three scientists mentioned in the article?The Earth Is Becoming Warmer – But Does It Matter?www.themegallery.comSkimmingLet’s check it: Sophie ArmstrongEarth CareDr Janice Foster, Charles Keeling, George Hambley True or false?( P27 )Reading Comprehension21.The temperature in the last century didn’t seem to increase much. 2.Everyone believes that global warming is caused by the activities of humans. 3.Janice Foster believes she can measure the future global rise in temperature. 4.The rise in carbon dioxide is causing a steady increase in global warming. 5.George Hambley believes that global warming will do good rather than harm to the earth. 6.It is clear what the effects of global warming will be.which scientist’s opinion do you agree with? List the positive or negative effects of global warming.Discussion cause the sea level to rise severe storms droughts famines the spread of diseases disappearance of speciesPositive effects Negative effects make plants grow faster crops will produce more a greater range of animals make life better George HambleyAssignmentRead the passage again and review the new words and expressions. Finish exercises on Page34(金榜一号）