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PugRexia t1_j6vfkdt wrote

Reply to comment by return_the_urn in US Emissions of the World’s Most Potent Greenhouse Gas Are 56 Percent Higher Than EPA Estimates. Electric utilities are likely responsible for the nation’s higher than expected emissions of sulfur hexafluoride, a greenhouse gas 25,000 times worse for the climate than carbon dioxide. by Wagamaga

It might be heavier than air but it's still a gas so it's really light, weather events, temperature, wind will all cause enough turbulence to disperse a plume and vertical mixing will send it up into the atmosphere. Think about it like a pile of feathers, they are light and a good gust of wind will send them scattering.

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