However, the changing period of the third Cold Stage, which is explained that existed in the early period of the Song Dynasty according to Zhu Kezhen, does happen in the period of Huizong Monarch.

• 其转变为第三个寒冷期的时间不是如近几十年来学者们承竺可桢所说的北宋前期，而是在北宋后期的徽宗初年。