The Summary concludes that stabilization of greenhouse gas concentrations is possible at a reasonable cost, with stabilization between 445ppm and 535ppm costing less than 3% of global GDP.
该摘要下结论说，温室气体浓度的稳定将需要一个适度的代价，比如浓度稳定于445ppm～535ppm将花费少于3%的全球GDP。