There are a wide variety of uses for SF 6, HFCs, and PFCs but they have been most commonly used as refrigerants and for fire suppression. These are sulphur hexafluoride (SF 6), hydrofluorocarbons (HFCs), and perfluorocarbons (PFCs). There are other greenhouse gases which have far greater global warming potential (GWP) but are much less prevalent. Water vapour is not considered to be a cause of man-made global warming because it does not persist in the atmosphere for more than a few days. It’s 20-year and 100-year GWP are basically the same. Nitrous oxide persists in the atmosphere for more than a century. Releasing 1 kg of N 2O into the atmosphere is about equivalent to releasing about 298 kg of CO2. The 100-year GWP is used to derive CO 2e. Methane’s 100-year GWP is about 28x CO2 – but it only persists in the atmosphere for a little more than a decade. Releasing 1 kg of CH4 into the atmosphere is about equivalent to releasing 84 kg of CO 2. All this time, it will be contributing to trapping heat and warming the atmosphere. 1 x – carbon dioxide (CO 2) NOTE: Any carbon dioxide added to the atmosphere will hang around for a long time: between 300 to 1,000 years.The three main greenhouse gases (along with water vapour) and their 20-year global warming potential (GWP) compared to carbon dioxide are: ( 1) Charts and tables in this Emissions section of our website convert all greenhouse gas (GHG) emissions into CO 2 equivalents so they can be compared.Įach greenhouse gas (GHG) has a different global warming potential (GWP) and persists for a different length of time in the atmosphere.

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