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According to the Intergovernmental Panel on Climate Change, SF 6 is the most potent greenhouse gas that has been evaluated, with a global warming potential of 23,900 times that of CO 2 when compared over a 100-year period.[37] Sulfur hexafluoride is inert in the troposphere and stratosphere and is extremely long-lived, with an estimated atmospheric lifetime of 800–3,200 years.

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Yes I saw that. Comment was comparing the CO2 emissions of the largest fossil fuel plant with a nuclear plant that releases 2000 KG of SF 6. If estimate the impact of SF 6 in terms of CO2 as 23,900 times the CO2 weight, than 2000 KG of SF 6 would be 2000 * 23900 = 47.8 million equivalent KG of CO2. Largest plant fossil fuel plant had emissions of 18 billion KG of CO2.

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