Perhaps the largest long-run sustainability issue concerns the adequacy of the global economy’s natural-resource base: output will more than triple over the coming two or three decades, as high-growth developing economies’ four billion people converge toward advanced-country income levels and consumption patterns. Existing economic-development strategies will require significant adaption to accommodate this kind of growth.
也许最大的长期可持续性隐忧在于全球经济自然资源基础是否充分：随着高增长发展中国家的40亿人口的收入水平和消费模式向发达国家看齐，产出将在未来二三十年内增长两倍以上。现有经济发展战略要求实施重大调整以适应这种类型的增长。