Indeed, it is not reasonable to expect that any country, rich or poor, should set or agree to 50-year targets. Given the structure of the problem – sequential decision-making with uncertainty about all the relevant parameters (including costs, the efficient pattern of mitigation, and technology) – it would be wiser to adopt a more flexible strategy that provides incentives and regulations to achieve measurable intermediate progress, while generating a lot of useful information along the way.
事实上，期待任何国家（无论贫富）制定或同意50年目标只是一种不切实际的幻想。由于问题本身的结构——涉及无法确定相关参数（包括成本、减排的有效模式和技术）的一系列决策——明智的做法是实施更为机动灵活的策略，为实现可以量化的中期进展提供激励和法规保障，并在实现目标的同时搜集很多有用的资讯。