降低风险的最小开销方案就是现在启动政策并且在未来数十年内逐步将现在全球能量系统转变为低温室气体排放或零排放的技术。
The least-cost option to lower the risk is to start now and steadily transform the global energy system over the coming decades to low or zero greenhouse gas-emitting technologies.
过去的十年，一些国家已经尽力在降低温室气体的排放，但是甲烷释放的“完美风暴”可能会抵消所有这些努力。
Some countries have been trying to reduce greenhouse gases emissions over the last decade, but a perfect storm of methane emissions may undo all the good work.
但是草案的确呼吁发达国家降低温室气体的排放量，以1990年的水平为标准，到2020年前至少降低25%，到2050年前至少降低50%。
But the draft does call on developed nations to cut greenhouse gas emissions by at least 25% from 1990 levels by 2020 and by at least 50% by 2050.
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