Unit 4 Global warming Warming up and reading课件 （33张PPT）

课件33张PPT。Unit 4 --warming up and readingGlobal warmingWe depend on energy to do many things in our daily lives. For example, energy lights our cities and heats our buildings. Make a list of things that use energy in your home. stove light things that use energy in your home micro-wave oven cassette player heating television hairdryer video player fridge computer washing machine stoveEnergy is so important to our life, but do you know the sources of energy. Wind energy is used as power to produce electricity . Windmillswhere electricity is produced by burning coals.The coal power stationsin which oil is refined and made pure. The Oil Refineriesa facility designed to change nuclear energy into electricity.A nuclear power plant on the roof of a house on a bright sunny day ,are used to collect solar energy, making your house warm or heating your water.Solar panelsThe Hydro-electric dams are used to keep back water and raise its level for irrigation or for producing electricity, etc.Geothermal (地热的) Energy Plant An energy source is “renewable” when supplies of it never run out and “non-renewable” when one day they will run out. Which energy sources on your list are renewable and which are non-renewable? Discusscoaloilnatural gaswind (wind power)sun (solar energy)uranium (nuclear energy)water (hydro-electric power)plant waste (biomass energy)geothermal energythe sea (tidal energy)non-renewablenon-renewablenon-renewablerenewablerenewablenon-renewablerenewablerenewablerenewablerenewableHave you ever seen a greenhouse?Pre-readinggreenhouseWhat is the greenhouse made and used for?They are made of glass and plants can grow in it when it is cold outside.How does it work?The glass traps the heat from the sun, making the air warm so that plants can grow better.Greenhouse gases!What’s greenhouse gases effect? Greenhouse gases perform the same fun_ction as the glass in a greenhouse -- They trap the heat of the sun and keep the air surrounding the earth warm. It is called the greenhouse effect.The Earth Is Becoming Warmer – But Does It Matter?Fast ReadingGlance at the article and answer these questions.Sophie Armstrong wrote the magazine article. The name of the magazine is “Earth care”.2.What are the names of the three scientists mentioned in the article?They are Dr. Janice Foster, Charles Keeling and George Hambley.1.Who wrote the magazine article? What is the name of the magazine?3.What do they think about global warming? Do they agree with one another?There are some very different attitudes among scientists towards this issue. Some think the effects will be terrible, while some others believe that we should not worry about it. 4.What are the two graphs about?Graph 1 shows the temperature increase of one degree Fahrenheit between 1860 to 2000.Graph 2 shows the carbon dioxide content in the atmosphere from 1957 to 1997.Graph 1:Graph 2:5.What is the main topic of the article?Global warming / The warming of the earth.Detailed-Reading Read the artic ... ...