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Six greenhouse gases are reported on: carbon dioxide, methane, nitrous oxide, hydrofluorocarbons, perfluorocarbons, and sulphur hexafluoride.
BBC: NI greenhouse gas emissions fall
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Emissions of all the gases, except sulphur hexafluoride, fell in Northern Ireland in the period 1990 - 2007.
BBC: NI greenhouse gas emissions fall
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This is done either with mineral oils, which present a fire hazard, or with sulphur hexafluoride, the most potent greenhouse gas.
ECONOMIST: Inside story