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  3. The benefits of some environmentally friendly policies will not be apparent until decades after they have been enacted. (46)That

The benefits of some environmentally friendly policies will not be apparent until decades after they have been enacted. (46)That

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问题     The benefits of some environmentally friendly policies will not be apparent until decades after they have been enacted. (46)That is one of the messages of a report from the United Nations Environment Programme, which, even by the standards of global environment assessments, is sobering reading.
    (47)Global Environmental Outlook 3(GE03), a study of the links between environmental, social and development issues, contains a range of dreadful but familiar predictions about the impact of factors such as climate change and industrial development. But the report, released last week in the run-up to August’s World Summit on Sustainable Development in Johannesburg, was unusually pessimistic about the prospects for reversing the damage.
    The new predictions are contained in one of four possible futures outlined in the report. The authors considered situations in which global politics were dominated by concerns over markets, environmental and social policies, security, or sustainability. These were based on attempts to calculate the effect of the different approaches on population levels, economics, technology and governance.
    Some of the situations produced a familiar picture. (48)In a world dominated by a market mentality, for example, land and forest ruin becomes a critical issue, particularly in Latin America and the Caribbean.
    But the sustainability situation’s predictions shocked some of the authors. "The delays between changing human behavior and environmental recovery came as the biggest surprise to the regional experts", says Jan Bakkes of the National Institute of Public Health and the Environment in Bilthoven, the Netherlands, one of the report’s authors.
    (49)The report found that even if environmentally friendly approaches were adopted now, carbon dioxide concentrations would continue to rise until 2050. Water shortages would continue and coastal pollution would increase slightly. Bakkes blames difficulty in changing energy and transport infrastructures.
    Originally used during the 1950s to simulate future conflicts, situations were revived in an improved form by the Intergovernmental Panel on Climate Change (IPCC) in the early 1990s. "By adding situations to assessments you come up with a credible story about how the world might develop and can translate that into quantifiable formation". says Bert Metz, also at the Bilthoven institute and co-chair of the IPCC working group on strategies for tackling climate change.
    More than 1,000 scientists contributed to GEOs, which divides the world into no less than 17 different regions. (50)By contrast, the IPCC has used just four regions in previous assessments, although the panel’s new chair, energy economist Rajendra Pachauri, has pledged to improve regional detail in future studies.

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答案相反，虽然专家组的新主席、能源经济学家Rajendra Pachauri已经提出在将来的研究中应更加注意各个地区的细节问题，但在过去的评估当中，IPCC却只选取了四个地区。
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