Current archaeological digs in the US show that as soon as the peaceful, environmentally-friendly, Indians come across the land bridge 10,000 years ago, the mega-fauna in the North American continent DISAPPEARED.
Over-hunting?
Did the environmentally-aware Indians cause the extinction of numerous animal species?
So much for the worship of "The Primitive".
I don't know the answer to that one, but I do know that the Indians were neither more nor less environmentally aware than any other group of humans. If they didn't over-exploit their resources it was only because they didn't need to.