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1、,Unit4 Global warming,Can you tell what we use energy for? Energy lights our cities Energy heats our buildings Energy entertains us ( watching TV; playing computer etc.) ,Where does all the energy come from?,Wind mills,风力,a coal power station,燃煤发电站,an oil refinery,炼油厂,a nuclear power plant,原子能发电站,太阳
2、能接受器,Solar panels,a hydro dam,水坝,Whats 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?,Try to tell as many as possible,lights heating television cassette player computer fridge washin
3、g machine hairdryer ,coal,Non-renewable,oil,Non-renewable,wind,renewable,nuclear,Non-renewable,sun,renewable,water,renewable,(hydro-electric power),(solar energy),Plant waste,renewable,hot spring,renewable,negative effects of using energy,Increasing CO2,pollution,global warming,Pre-reading,Pre-readi
4、ng What is it in the picture? Its a greenhouse made of glass. What is it used for? Its 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
5、the plants can grow throughout the cold period.,What is greenhouse gases?,The gases surrounding the earth, including carbon dioxide, methane and water vapor.,What do you think greenhouse gases do?,They trap heat from the sun and therefore warm the earth.,Reading,The earth is becoming warmer but does
6、 it matter?,While- reading,Paragraph 1,Introduce a debating over the issue of global warming,Paragraph 2-4,Illustrate how global warming comes about,Paragraph 5-10,List 2 different attitudes among scientists towards GW.,Paragraph 11,whether people should do something about GW. or not.,raising a question,giving examples, using graphs, explanation,give examples, making contrast,Using a question, leaving readers to think over the issue,Should we do nothing about global warming?,Debate:,Homework:,
