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There's a natural mechanism for reclaiming CO2 from the atmosphere. That is, plants use it as their primary fuel. But NF3? You put it into the air, it doesn't come out. Moreover, it wasn't there before.
I'm normally not really that worried about global warming, since I assume that a complete runaway (into a reducing atmosphere like you find on Venus) is impossible here due to the homeostatic effect. But, once you start dumping man-made chemicals that (practically) never go away into the air that also happen to be vastly more effective at trapping solar radiation.. not so sure of that anymore.
It's not a good idea IMO to err on the side of optimism in these things. Industrial scale NF3 should just go away, period.
