I bet they generate more CO2 in burning natural gas then they extract from air.
Granted they will recapture that CO2 as well. Net net, they are using energy to make and otherwise concentrate CO2.
Alex
"There is a cult of ignorance in the United States, and there has always been. The strain of anti-intellectualism has been a constant thread winding its way through our political and cultural life, nurtured by the false notion that democracy means that "my ignorance is just as good as your knowledge."
-- Isaac Asimov