《unit4词汇听写文章课件》由会员分享，可在线阅读，更多相关《unit4词汇听写文章课件（9页珍藏版）》请在金锄头文库上搜索。
1、THE EARTH IS BECOMIG WARMER- BUT DOES IT MATTER?听写词汇unit4词汇听写文章 During the 20th century the temperature of the earth 1._ about one degree Fahrenheit. That 2._ does not seem much to you or me, but it is a 3._ increase when compared to other natural 4._. So how has this 5._ and does it matter? Earth c
2、ares Sophie Armstrong 6._. These questions There is no doubt that the earth is becoming warmer (see Graph 1) and that it is human 7._ that has caused this 8._ warming rather than a 9._ but natural 10._.roseprobablyrapidchangescome aboutexploresactivityglobalrandomphenomenonunit4词汇听写文章 All scientists
3、 1._ the view that the increase in the earths temperature is due to the burning of 2._ _ like coal, natural gas and oil to produce energy. Some3. _ of this process 4._ “greenhouse” gases, the most important one of 5._ is carbon dioxide. Dr Janice Foster explains: “There is a natural phenomenon that
4、6._ call the “greenhouse effect”.This is when small amounts of gases in the 7._, like carbon dioxide, methane and water vapour, trap heat from the sun and 8._ warm the earth. fossil fuelssubscribe tobyproducts are called which scientists atmosphere thereforeunit4词汇听写文章 Without thegreenhouse effect t
5、he earth would be about thirty-three degrees Celscius 9._ than it is. So, we need those gases. The problem 10._ when we add huge 11._ extra carbon dioxide into the atmosphere. It means that more heat energy 12._ to 13._ in the atmosphere 14._ the global temperature to 15._. begins quantities oftends
6、 be trapped causing go up coolerunit4词汇听写文章 We know that the levels of carbon dioxide 1._ greatly over the last 100 to 150 years. It was a scientist 2._ Charles Keeling, 3._ made 4._ 5._ of the amount of carbon dioxide in the atmosphere from 1957 to 1997. He found that between these years the carbon
7、 dioxide in the atmosphere went up from around 315 parts to around 370 parts 6._ million (see Graph 2)have increasedcalledwhoaccuratemeasurementsperunit4词汇听写文章 All scientists accept this 7._. They also agree that it is the burning of more and more fossil fuels that has 8._ this increase in carbon di
8、oxide. So how high will the temperature increase go? Dr Janice Foster says that over the next 100 years the 9._ of warming could be as low as 1 to 1.5 degrees Celsius, but it could be 10. _ high as 5 degrees.dataresulted inamountasunit4词汇听写文章 However, the 1._ of scientists 2._ this rise in 3._ diffe
9、rent. On the one hand, Dr Foster thinks that the 4._ which increases the temperature by 5 degrees would be a 5._. She says, “ We cant 6._ the climate well enough to know what 7._, but it could be very serious.” Others who 8._ _ her think there may be a rise of several metres in the sea level, or pre
10、dict severe storms, 9._, 10._, famines, the spread of diseases and the disappearance of species. attitudetowardscompletelytrendcatastrophepredictto expectagree withfloodsdroughtsunit4词汇听写文章 On the other hand, there are those, like George Hambley, who 1._ this view, believe that we should not 2._ _ h
11、igh levels of carbon dioxide in the air. They predict that any warming will be 3._ with few bad 4._ 5._. In fact, Hambley 6._, “More carbon dioxide is actually a 7._ thing. It will make plants grow quicker; crops will produce more; it will 8._ a greater 9._ of animals-all of 10._ will make life for
12、human beings better.”are opposed to worry aboutmildenvironmentalconsequencesstatespositiveencouragerangewhichunit4词汇听写文章 Greenhouse gases continue to 1._ in the atmosphere. 2._ we start 3._ the amount of carbon dioxide and other greenhouse gases, the 4._ is going to 5._ warming for 6._s or 7._. No one knows the 8._ of global warming. Does that 9._ we should do nothing? Or, are the 10._s too great?build upEven ifreducingclimatekeep ondecadecenturieseffectsriskmeanunit4词汇听写文章
