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 "Direct air capture is a method to take us back to [Earth] like it was 100 or more years ago," says Zhou, adding that half a pound of COF-999 can remove as much #CO2 from the air in one year as a tree — 44 pounds worth.

https://sfist.com/2024/11/12/uc-berkeley-chemists-announce-potentially-massive-discovery-a-powder-that-captures-carbon-from-air/ 
 well, it's not a chain reaction, supposedly it can be stopped when reaching the right gas level...supposedly