Unit6 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 更多资源xiti123.taobao.com 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 Solar panels 太阳能接受器 a hydro dam 水坝 What’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? Try to tell as many as possible Things that use energy Sources of energy Renewable/ Non-renewable Non-renewable lights wind heating Non-renewable coal television Non-renewable oil cassette player Non-renewable nuclear computer fridge sun(solar energy) renewable washing machine water (hydro-electric power) renewable hairdryer … renewable Plant waste hot spring renewable negative effects of using energy Increasing CO2 pollution global warming Pre-reading 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. 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 it matter? 更多资源xiti123.taobao.com While- reading Main idea of each part Writing techniques Paragraph 1 raising a question Introduce a debating over the issue of global warming Paragraph 2-4 giving examples, Illustrate how global using graphs, warming comes about explanation Paragraph 5-10 List 2 different attitudes among scientists towards GW. Paragraph 11 give examples, making contrast Using a question, whether people should do leaving readers to something about GW. or not. think over the issue Homework: Debate: Should we do nothing about global warming?