ENVIRONMENTAL ISSUES AND THE NATURAL WORLD ( Part 5)
Causes of Climate Change
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(a) The Role of Humanity: Change the form of the word in square brackets suitably to fit each gap.
The greenhouse effect is essentially the process by which the 1. _______________ [absorb] and 2. _______________ [emit] of infrared radiation by gases in the atmosphere warms the planet’s lower atmosphere and surface. Put simply, the so-called greenhouse gases which cause this effect basically redirect heat that would otherwise escape back into outer space down towards the surface of the earth. This phenomenon is actually key to creating conditions 3. _______________ [conduct] to life on Earth. Without the natural 4. _______________ [occur] of these gases and consequent planetary warming, Earth would actually be a very 5. _______________ [hospitable] place. The problem, however, began in the 1800s during the industrial revolution. The increased amount of industrial activity led to additional volumes of greenhouse gases being produced unnaturally as a result of human activity. Obviously, as the level of industrial activity has increased dramatically over the last several centuries, so too then has the rate of production and emission of greenhouse gases. Human activity has therefore altered the balance of things with 6. _______________ [concentrate] of greenhouse gases such as C02 and methane in the atmosphere significantly higher today than at any other time in the past 800,000 years of Earth’s history. About two-thirds of the additional C02 released is attributed to the burning of fossil fuels, while the rest of the increase in atmospheric greenhouse gas levels is put down to changes in land-use, in particular 7. _______________ [forest], and population growth, which, for example, has led to greater numbers of livestock than ever before being reared for 8. _______________ [consume], and a consequent significant increase in methane emissions. The 9. _______________ [deplete] of the tropospheric ozone layer, caused by chlorofluorocarbons, has also had a significant warming effect on the Earth’s surface, but this is not to be confused with the greenhouse effect as the two phenomena are largely 10. _______________ [relate]. Given the relative 11. _______________ [abound] of fossil fuels, our 12. _______________ [depend] on them, and the 13. _______________ [emerge] of new and more efficient methods of 14. _______________ [extract], the likelihood of a significant reduction in carbon emission levels in the near future seems very unlikely. Therefore, the problem of global warming also appears very unlikely to moderate. Besides, many scientists believe the damage already done may be 15. _______________ [reverse].
(b) Nature’s Role: Use the words from the box to fill gaps 1-6. You may have to change the tense or form, and you should only use each word once.
|exacerbate emit penetrate reflect intensify reverse|
If anything, while humankind has been 1.___________ the warming situation, nature herself, by happy coincidence, has been behaving in such a way as to partially 2. ___________ the effects, and, over the last half a century or so, in particular, nature has had a significant cooling effect. For a start, there has been a significant 3. ___________ of volcanic activity, and the consequent release of particulates and soot contributed to what is termed Global Dimming, a cooling phenomenon whereby more of the Sun’s rays are prevented from 4. ___________ the atmosphere and reaching the planet’s surface, and are instead 5. ___________ back out into space. Another cooling factor is that of solar output. If anything, less solar radiation has been 6. ___________ by the Sun in the past thirty years or so.
Causes of Climate Change
1 absorption 2. emission 3. conducive 4. occurrence 5. inhospitable
6 concentrations 7. deforestation 8. consumption 9. depletion 10. unrelated
11 abundance 12. dependence 13. emergence 14. extraction 15. irreversible
1 exacerbating 2. reverse 3. intensification
4 penetrating 5. reflected 6. emitted
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