It's closer to 50%. It's basically only the ECN and affiliates that claim 70%. If there were no longer trees giving oxygen the earth would be completely unlivable not only because the oxygen concentration be far too low to support human life (along with most everything else) the carbon dioxide (which some claim is already past the point where more trees can save us) would get much much worst and cause average temperatures to rise to the point where even if we had enough oxygen we wouldn't be able to survive because of the temp
Comments