< p >这个问题解决在自然纸”< a href = " https://www.nature.com/articles/ncomms14383 " rel = " nofollow noreferrer " >了解冰川甲烷循环< / >”(Hopcroft et al . 2017年)。< / p > < p >,结论是,甲烷浓度的变化是由生物圈的变化与全球温度变化有关。的主导因素是减少甲烷排放量湿地在寒冷的气候。还有一个减少排放与森林火灾在寒冷的阶段(寒冷的气候意味着更少的森林火灾;气候变暖意味着更多的森林火灾)。< / p >Note that the model used by Hopcroft et al. has the CO2 levels prescribed. In this situation the temperature changes in response to the CO2, and then the methane changes in response to the temperature.