coberst suggested;--Natural selection of creatures on this planet has been, to a significant degree, taken control of by human technology........so NO natural selection until humans appeared?..... that is not sensible. I think that you are not in fact talking about natural selection, but something else, I have no idea what.

terry-I like the Gaia theory. I remember reading a lovely crazy description of the planet ridding itself of aberrant species by shaking like a wet dog dislodges fleas. Gives a new perspective on earthquakes!! It is nice to imagine the Earth could recover from the stuff we are doing to it though. Let's hope so.