Global Warming At the Kyoto conference on global warming in December 1997, it became abundantly clear how complex it has b

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问题                                          Global Warming
      At the Kyoto conference on global warming in December 1997, it became abundantly clear how complex it has become to work out international agreements relating to the environment because of economic concerns unique to each country. It is no longer enough to try to forbid certain activities or to reduce emissions of certain substances. The global challenges of the interlink between the environment and development increasingly bring us to the core of the economic life of states. During the late 1980s we were able, through international agreements, to make deep cuts in emissions harmful to the ozone layer, These reductions were made possible because substitutions had been found for many of the harmful chemicals and, more important, because the harmful substances could be replaced without negative effects on employment and the economies of states.
      Although the threat of global warming has been known to the world for decades and all countries and leaders agree that we need to deal with the problem, we also know that the effects of measures, especially harsh measures taken in some countries, would be nullified (抵消) if others countries do not control their emissions. Whereas the UN team on climate change has found that the emissions of carbon dioxide would have to be cut globally by 60% to stabilize the content of CO2 in the atmosphere, this path is not feasible for several reasons. Such deep cuts would cause a breakdown of the world economy. Important and populous (人口众多的) low—or medium-income countries are not yet willing to undertake legal commitments about their energy uses. In addition, the state of world technology would not yet permit us to make such a big leap.
      We must, however, find a solution to the threat of global warming early in the 21st century. Such a commitment would require a degree of shared vision and common responsibilities new to humanity. Success lies in the force of imaginations, in imagining what would happen if we fail to act. Although many living in cold regions would welcome the global-warming effect of a warmer summer, few would cheer the arrival of the subsequent diseases, especially where there had been none.  
The reason why it is difficult to get rid of the threat of global warming is that______.

选项 A、the leaders of many countries are not fully aware of the gravity of the problem
B、world technology is not able to solve the problem
C、not all the countries are willing to make deep cuts in emissions
D、many people welcome the global-warming effect of a warmer summer

答案C

解析 难以消除全球变暖这一威胁的原因是:A 许多国家的领导者尚未充分认识到这一问题的严重性;B国际技术水平还不能解决这一问题;C 并非所有的国家都愿意大幅度地减少有害物的排放量;D 许多人对全球变暖所产生的温暖夏季效应持欢迎态度。
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