选修6 unit 4 Global Warming warming up and reading课件（共39张）

课件39张PPT。 Unit 4 Global WarmingHow did come about?the snow catastrophe Some scientists believed that global warming was one of the major reasons why such extreme climate like severe storms and heavy snow frequently came about.Think about :What causes global warming? Human activity or a random but natural phenomenon?When we talk about this problem, we naturally link it to the use of energy and the environmental pollution.But firstly and importantly, energy makes a great difference to our lives. What things do we use energy for?We _____energy to do many things in our lives. For axample, energy _____our cities and _____our buildings. What other things do we use energy for?depend onlightsheatswww.themegallery.comThings that use energy around us or at any other places:In a houseWhere does all this energy come from?www.themegallery.comPlace and the related energyWind power windPlace and the related energya coal power station coalPlace and the related energyoil refinery （提炼厂）oilPlace and the related energynuclear power stationUranium 铀Place and the related energysolar panels （镶板） solar powerPlace and the related energya hydro-electric power（与水有关的）waterEnergy at home,school …sources of energythings using energy Lights Heating Television Cassette player Video recorder Computer Fridge Stove Washing machine Hairdryer Coal Oil Natural gas Wind (wind power) Sun (solar energy) Uranium (nuclear energy) Water (hydro-electric power)Energy at home, school …sources of energyrenewable or non-renewableCoal Oil Natural gas Wind (wind power) Sun (solar energy) Uranium (nuclear energy) Water (hydro-electric power) Non-renewable Non-renewable Non-renewable Renewable Renewable Non-renewable Renewable Let’s try to save energy! To save energy is to save our earth!!Slogan['sl?ug?n] --n. 标语,口号As we know, coal, oil and natural gas are called _____ , which is a kind of energy. It can make a great _____to our lives. But do you know what by_____ is produced when we burn fossil fuel? Is it good for our planet? What ph_____ is caused by it?differenceenomenonproductfossil fuelFossil FuelFossil Fuelcoaloil natural gas● ● ● ● ● ●Why?Picture readingA greenhousegreenhousePicture readingA greenhouse is made of _____ and is used for growing _____, especially during _____ weather.What is a greenhouse made of and used for?glassplantscoldThe air inside is warm because the glass _____ the heat from the sun and keeps it from _____. This makes the greenhouse _____ and so the plants can grow _____.trapsescapingheat upthroughout the cold periodHow does a greenhouse work?Now can you connect global warming with greenhouse and think of the relationship between them? Maybe you can understand why we call global warming “greenhouse effect”, right?What’s greenhouse effect?greenhouse effectSurely we need greenhouse gases. Without greenhouse effect, the earth would be_____.In the atmosphere surroudning the earth there are gases called “greenhouse gases”. What do you ... ...