I am really sure because the impossiblity of it.
The shooting the bird statment was a woe full attempt to add levity to an already too serious thread. come on guys a little humor please.

I have no faith in human perfectability. I think that human exertion will have no appreciable effect upon humanity. Man is now only more active - not more happy - nor more wise, than he was 6000 years ago. Edgar Allan Poe