It has two components: first, halt or reverse growth of air pollutants, specifically soot, atmospheric ozone and methane; second, keep average fossil-fuel carbon dioxide emissions in the next50 years about the same as today.

• 这包括两部份：第一，空气污染停止成长，甚至是负成长，尤其是煤烟、气层臭氧与甲烷；第二，未来50年，化石燃料的二氧化碳平均排放量要维持与今日相同。