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.
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。
If the option is not exercised, the cost of contingent options will be zero.
如果不行使权利，或有期权持有者的成本为零。
If the option is not exercised, the cost of contingent options will be zero.
如果不行使权利，或有期权持有者的成本为零。
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