(Aka long-lived greenhouse gas)
A greenhouse gas that stays in the atmosphere long enough cause warming. Click here to view the IPCC's list of LLGHGs.
Example Usages -
1. "The NOAA Annual Greenhouse Gas Index shows that from 1990 to 2011 radiative forcing by Long-Lived Greenhouse Gases (LLGHG’s) increased by 30%, with CO2 accounting for about 80% of this increase."
(Source: Climate Change Adaptation – Swallowing Our Own Medicine )