We expect improved technology and its spread to make the world of 2100, at a 2% annual growth rate, much richer: $50,000 per capita of year-2006 purchasing power. So the critics argue that we need the marginal $70 per capita today much more than the richer people of 2100 will need the $500 that they would gain from being spared the effects of global climate change.
而另一方面，批评家们指出今天的世界是贫穷的：年平均人均GDP按购买力平价是约7000美金。我们期望技术的进步及其扩展以2%的年增长率使2100年的世界比现在富裕得多：以2006年的购买力计算达到5万美金。因此，批评家们认为比起2100年更为富裕的人们对于未受全球气候变化影响而获得的500美金的需求度而言，今天的我们更需要这人均70美金。