| http://www.w3.org/ns/prov#value | - Moreover, there are a number of entirely human-made greenhouse gases in the atmosphere, such as sulphur hexafluoride (SF6), hydrofluorocarbons (HFCs), and perfluorocarbons (PFCs).1HHydrofluorocarbons (HFCs)Hydrofluorocarbons (HFCs) are a class of synthetic chemical compounds that contain only fluorine, carbon and hydrogen.
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