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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. Below is a list of 100-year GWPs:
Carbon dioxide (CO2)
GWP:1
Methane (CH4)
GWP: 21
Nitrous oxide (N2O)
GWP: 310
Hydrofluorcarbons (HFCs)
GWP: 150 – 11 700
Perfluorcarbons (PFCs)
GWP: 6 500 – 9 200
Sulphur hexafluoride
GWP: 23 900
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Greenhouse Gases (GHGs)
Greenhouse gases (GHGs) are trace gases that control energy flows in the Earth?s atmosphere by absorbing infra-red radiation. Some GHGs occur naturally in the atmosphere, while others result from human activities. There are six GHGs covered under the Kyoto Protocol ? carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), hydrofluorcarbons (HFCs), perfluorocarbons (PFCs) and sulphur hexafluoride (SF6). CO2 is the most important GHG released by human activities.
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Green Investment Scheme (GIS)
The purpose of Green Investment Schemes is to promote the environmental effectiveness of AAUs transfers, by earmarking revenues from these transfers for environmentally-related purposes in the seller countries.