While CO2 can remain in the atmosphere for centuries, other pollutants, including black carbon and ozone, remain for relatively periods – days, weeks, months, or years – so that reducing or ending emissions promises almost immediate climate benefits.
而虽然二氧化碳可以在大气中存在数百年，但包括炭黑和臭氧在内其他污染物却只能存在一段时间——数天，数周，数月或者是几年——因此减少或者终止这类物质的排放所获得的好处几乎是立竿见影的。