Kid_A wrote:you people have no idea what you're talking about.
Educate yourself!!
Live on earth BEGAN with oxygen. As well as methane amonia nitrogen. There is not a single living organism on this planet that could survive without oxygen
In fact, there are many billions of organisms that can survive without oxygen. Life was probably started by bacteria clustering around oceanic vents, living off the Sulphur.
Later various other types of Bacteria appeared, which breathed other things like Carbon Dioxide, and ammonia. The Carbon Dioxide ones breathed in Carbon Dioxide, and expelled Oxygen. After a while the Oxygen built up and Oxygen breathing Bacteria evolved, which evolved into plants, animals, etc...
But thses Carbon Dioxide breathers are still around, deep in the Earths crust, just waiting to come out and destroy us all!
No... wait... their not going to do that, but they are still alive.
That is all.
P.S. The Sulphur ones are still around
P.P.S. there is no way in hell that the Earth will be uninhabitable to humans in 40 years. The Earth has been hit by Meteriorites that detonated with more than 10 times humanities nuclear stockpile at the hight of the Cold War and reasonably complex life survived that. The current Western society might crumble (probably a good thing...) but there is no way Humanity will die out on that short a timescale.