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.