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  3. At the Kyoto conference on global warming in December 1997, it became abundantly clear how complex it has become to work out int

At the Kyoto conference on global warming in December 1997, it became abundantly clear how complex it has become to work out int

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问题     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 caressingly bring us to the core of the economic life of the states. During 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 importantly, 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 if other countries do not control their emissions. Whereas the UN team calls on the emissions 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 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 tropical diseases, especially where there had been one.
What should all countries do to help solve the problem of global warming?
选项 A、They should hold another world conference on climate change.
B、They should provide advanced technology.
C、They should replace all the harmful substances.
D、They should willingly undertake legal commitments about their energy uses.
答案D
解析 文章第二段讲即使有些国家采取了harsh measures，但是如果其他国家do not control their emissions，这些措施would be nullified。因为全球变暖是一个世界性的难题。下文接着说有些国家not yet willing to undertake legal commitments about their energy uses。所以，如果所有国家都自愿控制温室气体排放，那将会对解决全球变暖问题有所帮助。
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