第三期IPCC报告显示强硬的气候政策也比之前所说的更加昂贵 — — 2030年将占GDP的4 % ， 2050年6 % ， 2100年11 % 。
The third installment of the IPCC report showed that strong climate policies would be more expensive than claimed as well – costing upwards of 4% of GDP in 2030, 6% in 2050, and 11% by 2100.