User blog comment:Ironreaper/Things i would like to see in Mass Effect 3/@comment-1763658-20100410010810

So you're saying that if we remove all the trees from earth we could live off the oxygen already produced? Don't you know that once we breathe oxygen, it is not replaced into the atmosphere without plants. In layman's terms, we need trees to steadily make oxygen for us. You were supposed to learn that in 2nd grade.