Targets can be adjusted in light of future developments to be more or less aggressive, (probably more, if the scientists’ predictions are borne out). Negotiations on the INDC revisions are to begin in 2018, even though the first set of targets is scheduled to take effect in 2020.
其次，巴黎协定包含了未来评估和修订目标的程序。每五年，各方将进行盘查、更新承诺。目标可以根据未来发展情况调整激进程度（更加激进的可能性更大，如果科学家的预测兑现的话）。INDC修订谈判将从2018年开始，尽管第一批目标的效力期限定在了2020年。