So what happens when the concentration of CO2 in our atmosphere increases? To a point it helps sustain life, but too much, and it changes the equilibrium and can screw things up (just as too little will do the same). Forgetting anything about global warming (which of course is highly debated), if you significantly change any parts of the atmospheric makeup, there will be negative effects on something.Ohh and guess what pathetic green liberal, if we did manage to eliminate all CO2, forgetting the fact that we would be dead. Ummm ALL THE TREES AND PLANTS WOULD DIE. This so called poison, is food for plant life.
There's a difference between safe/normal levels of gasses, and unsafe levels. Give a human too much oxygen concentration, and there will be negative effects, just as not enough oxygen will - Oxygen toxicity - Wikipedia, the free encyclopedia . Your argument doesn't really have any weight, other than a bad attempt at portraying only one side of extreme situations.