Q&A: What effects would there be if earths percentage of atmospheric oxygen were to change?

Question by Winters: What effects would there be if earths percentage of atmospheric oxygen were to change?
Would humans be able to breath air that is less than 21% O2? If so, what is the threash hold? What about higher cconcentrations of O2? Just curious. Also, is there any likelyhood that that with our destruction of the environment that we could eliminate the cyanobacteria that produce the majority of our oxygen. Has the loss of rain forest area affected concentrations of O2?

Best answer:

Answer by GreenMan
Anything THAT DESTROYS OXYGEN DESTROY LIFE.

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