Global Warming Potential (GWP)
The global warming potential is the impact a greenhouse gas (GHG) has to global warming. By definition, CO2 is used as reference case, hence it always has the GWP of 1. GWP changes with time, and the IPCC has suggested using 100-year GWP for comparison purposes.
Greenhouse gases (GHGs)
Gases released by human activity that are responsible for climate change and global warming. The six gases listed in Annex A of the Kyoto Protocol are carbon dioxide (CO2), methane (CH4), and nitrous oxide (N20), as well as hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulfur hexafluoride (SF6).
see Global Warming Potential.