translation.en: And then we have two parameters which we were not able to quantify -- air pollution, including warming gases and air-polluting sulfates and nitrates, but also chemical pollution.
translation.zh: 还有两个我们无法量化的参数-- 空气污染， 包括温室气体和空气污染的硫酸盐和硝酸盐， 以及化学污染。