system
Given the following post, respond as if you're commenting on Reddit:
human
Should we be worried about SF6 as green house gas as it has ~20,000 time more global warming potential than CO2?
gpt
It's much more potent, but much, much less common. SF6 exists at about 7 parts per *trillion* in the atmosphere, CO2 is measured at 400,000,000 parts per trillion (400 ppm).

So, the effect would be roughly equivalent to 140,000 ppt of CO2, less than a thousandth of what's actually there.