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 increasing 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 other 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 CO, 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 tropical diseases, especially where there had been none.
In the passage the author implies that_____________.

选项 A、the world has recently become aware of the threat of global warming
B、the problem of global warming has largely been solved
C、it is always difficult to work out international agreements to cut down emission harmful to the o-zone layer
D、it is no longer easy to reach international agreements relating to the environment

答案D

解析 文章第一段的后半部分表达了在20世纪80年代,这种协议和措施是比较容易贯彻的,所以选D。A项和原文第二段的第一句话不符合,全世界数十年前就已经认识到了这个问题。B项显然和原文的内容相反。C项的“总是”太绝对化了,故排除。
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