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Countries signing the Montreal Protocol on Substances That Deplete the Ozone Layer have pledged to eliminate manufacture and use of halocarbons .
Minor greenhouse gases include methane, nitrous oxide, sulfur hexafluoride and halocarbons such as perfluoromethane, freon and other CFCs.
In recent years, society has introduced new greenhouse gases into the atmosphere, namely CFCs and other halocarbons .
It should also be mentioned that other chemical substances have attacked the ozone layer including nitrous oxides from fertilisers, chlorine, carbon dioxide and bromine halocarbons .
Selecting either a halocarbon or inert gas, two types of clean agents, depends upon available space for suppression system tanks and venting capabilities.
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