The surface warming caused by human production of other greenhouse gases, however, leads to an increase in atmospheric water vapor because warmer temperatures make it easier for water to evaporate and stay in the air in vapor form.
This creates a positive “feedback loop” in which warming leads to more warming. When greenhouse gases are emitted into the atmosphere, many remain there for long time periods ranging from a decade to many millennia.
In other words, a concentration of 1 ppb for a given gas means there is one molecule of that gas in every 1 billion molecules of air.
Some halogenated gases are considered major greenhouse gases due to their very high global warming potentials and long atmospheric lifetimes even if they only exist at a few ppt (see table).
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