of the tree of life. We may well inflict wholesale havoc on the other branches and thereby take our own branch down along with theirs. But as has happened before - life will re-emerge from the aftermath. And in that next staging, life might be lucky enough not to reinvent a specieal branch that develops a brain such as ours. Subsequent events of extinction will likely be due to natural causes. Of course, one CAN argue that the emergence of our species IS a natural cause for extinction as well. That assessment only perceived otherwise by our flawed judgement. The general consensus of the universe may be that what's happening on Earth is just what usually happens when a self-aware life form rises to prominence and then takes its environment down with it. It may well have happened many times before and likely will keep on happening wherever such creatures evolve!