Just tidying up some points that I think hadn't been addressed in the discussion.
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Look at Carbon 0.04%? If you think that minute trace element would possibly make any difference to world climate, then you must also believe homeopathic remedies work as well!
Ah, the theory of "something that minute can't hurt you," STMCHY. If 0.04% of carbon dioxide in the atmosphere isn't enough to hurt I assume that you would have no problem in an atmosphere of 0.004% hydrogen cyanide would you? After all, it's 1/10 the amount of carbon dioxide you believe is too minute to cause harm.
And carbon dioxide is a natural substance, a plant food, some others have pointed out. They aren't submariners or miners either. If they were they would know that an atmosphere of the minute amount of 1%* carbon dioxide is fatal to humans as well as other vertebrates. Submariners trapped in a submarine or miners trapped in a mine tunnel aren't at risk of dying from the lack of oxygen, they will die from carbon dioxide poisoning long before the oxygen would run out.
I would like to compare your STMCHY theory to the case of viruses and bacteria in the human body but at some point, you have to start questioning your beliefs in light of how many times your points, like this one, have been shot down.
By the way, I would never let you sit in a room that has 40 ppm of hydrogen cyanide, which is the upper range of what is fatal for humans, the concentration which is fatal for all. Some will die in an atmosphere of 20 ppm.
* to 14%, depending on how long you are exposed to it, how the carbon dioxide is dispersed, and your physical condition.