高二英语下册unit4 课高二英语下册unit4 课件高二英语下册unit4 课件高二英语下册unit4 课件.pptVIP

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? an oil refinery Pre-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. Reading Paragraph 2-5 Illustrate how global warming comes about Human activity → Burning of fossil fuels (coal natural gas and oil) → Greenhouse effect → Greenhouse gases (Carbon dioxide methane and water vapour) → We need those gases Paragraph 2-5 Illustrate how global warming comes about → Huge quantities of extra Carbon dioxide → From 1957 to 1997 → From around 315 parts per million to around 370 parts per million Paragraph 6 Illustrate how global warming comes about 1. Negative(消极的): ①the sea level to rise ②severe storms ,droughts , famines .the spread of disease and the disappearance of species. 2 . Positive(积极的): ①plants grow quicker. ②crop will produce more. ③encourage a greater range of animals. Who wrote? What’s the name of the magazine? Sophie Armstrong. “Earth Care”. What are the names of the three scientists mentioned? Dr Janice Foster, Charles Keeling, George Hambley. Is the global warming terrible? Different. What are the two graphs about? The first graph shows the temperature of one degree Fahrenheit between 1860-2000.The Second graph shows the carbon dioxide content in the atmosphere from 1957-1997. What’s the main topic of the article? Global warming/ the warming of the earth. * Unit6 Global warming Wind mills 风力 a coal power station 燃煤发电站 炼油厂 a nuclear power plant 原子能发电站 太阳能接受器 Solar panels a hydro dam 水坝 What’s the difference between wind power and coal power? Wind will n