Moreover, there are enormous co-benefits to mitigation: lower emissions of GHGs would be accompanied by lower air pollution and increased energy security, agricultural output, and employment. If these co-benefits were taken fully into account, that price tag of 3% of GDP in 2030 would be substantially lower, perhaps even negative.
IPCC还发现，在2030年，如此严格的减排措施成本不会超过全球GDP的3%。而且，减排还能带来巨大的附带利益：减少温室气体的排放可以降低空气污染，提高能源保障、农业产量和就业。如果充分考虑这些附带利益，2030年GDP的3%的代价还会大幅度降低，甚至降为负数。全世界说不定还能通过推行缓解气候变化的措施提高经济产出和福利。