Unit7EnvironmentalPollution(Reading)

1、WelcomeWelcomeUnit 7 Environmental Pollution （Reading) ) The Greenhouse EffectLearning aims:1. Ss will learn something about the Greenhouse Effect and know the result of it.2. Ss will know the importance of environment protection .温室效应温室效应(英文：英文：Greenhouse effect)，又称，又称“花房效花房效应应”，是大气保温效应的俗称。由环境污染引起的

2、温，是大气保温效应的俗称。由环境污染引起的温室效应是指地球表面变热的现象。温室效应主要是由室效应是指地球表面变热的现象。温室效应主要是由于现代化工业社会过多燃烧煤炭、石油和天然气放出于现代化工业社会过多燃烧煤炭、石油和天然气放出大量的二氧化碳气体进入大气造成的，因此减少碳排大量的二氧化碳气体进入大气造成的，因此减少碳排放有利于改善温室效应状况。太阳短波放有利于改善温室效应状况。太阳短波辐射辐射可以透过可以透过大气射入地面，而地面增暖后放出的长波辐射却被大大气射入地面，而地面增暖后放出的长波辐射却被大气中的气中的二氧化碳二氧化碳等物质所吸收，从而使地表和低层大等物质所吸收，从而使地表和低层大气变

3、暖，如果大气不存在这种效应，那么地表温度将气变暖，如果大气不存在这种效应，那么地表温度将会下降约会下降约30或更多。反之，若温室效应不断加强，全或更多。反之，若温室效应不断加强，全球温度也必将逐年持续升高。因其作用类似于栽培农球温度也必将逐年持续升高。因其作用类似于栽培农作物的作物的温室温室，故名温室效应。温室效应被很多科学家，故名温室效应。温室效应被很多科学家认为是认为是全球变暖全球变暖的原因的原因。Translate some phrases in the passage.1.1.一层一层2.2.通过通过3.3.阻止某人做某事阻止某人做某事4.4.升高的温度升高的温度5.5.在南北极在南北

4、极6.6.海平面海平面7.7.严重的水灾严重的水灾8.8.此刻，现在此刻，现在9.9.在将来在将来10.10.慢下来慢下来11.11.化工燃料化工燃料12.12.保护热带雨林保护热带雨林13.13.自然能量自然能量a blanket ofpass throughstop sb. from doingrising temperatureat the North and South polesthe level of the seaserious floodsat the momentin the futureslow downfossil fuelprotect rain-forestsnatu

5、ral energyRead the passage while listening to the tape . Tell “T” or “F”.( ) 1. The atmosphere around the Earth helps to keep the temperature of the Earth constant.( ) 2.The Earth is getting hotter because of pollution.( ) 3. A greenhouse becomes hot because its glass traps some of the heat from the

6、 sun.( ) 4. The Greenhouse Effect will make the ice melt at the North and South Poles.( ) 5. The Greenhouse Effect will make the whole world drier.( ) 6. We cant stop the Greenhouse Effect, but we can stop the Earths temperature from rising.TTTTFFRead the passage again and answer the following quest

7、ions.1.How have the gases kept the planets temperature at about 15 for so many years?2. Why is the Earth getting hotter?3. How does a greenhouse work?By trapping some of the sun heat.Its glass lets the suns heat pass through, then stops some of it from leaving.Because there are more and more hot gas

8、es released into the atmosphere.4. What do many scientists agree by 2030?5. Will the level of the sea rise? Why?They agree that the Greenhouse Effect will add between 1.5-4 to the Earths temperature.Yes. Because the ice at the North and South Poles will start to melt.6. Whats the problem of food when the climate changes?7. Will the whole world become wetter in the future?8. How can we slow the Greenhouse Effect down?There will be less food in the world.No. Some parts will become wetter while some parts will become drier.We should use less fossil fuel, protect rain-forests and so