Scientists now estimate that somewhere close to 50% of climate change is being caused by gases and pollutants other than CO2, including nitrogen compounds, low-level ozone formed by pollution, and black carbon. Of course, a degree of scientific uncertainty about some of these pollutants’ precise contribution to warming remains.
因此我们从《蒙特利尔议定书》中得到的经验的将具有更广泛的意义。目前科学家估计约有50%的气候变化是由二氧化碳以外的各种气体和污染物所导致的，其中包括一些氮化合物，由污染产生的低空臭氧以及炭黑。当然，这些物质到底对全球变暖影响多大依然有待科学证实，但毫无疑问的是，它们也是极为重要的元凶。