What would happen to earth if all the factories that produce carbon monoxide stopped?
Volcanos would belch the stuff out.
We would have a beautiful world
It might be good for the air quality, but total human anarchy might possibly result due the immediate shut down of production of just about everything we need to survive, including food. I think?
Not much would change, besides eye sores of abandoned buildings and high unemployment. Carbon dioxide is necessary for humans, plants turn in into oxygen.