Pessimistic
In addition to this being a pessimistic and overly negative worldview, we can see in many instances how man adapted and changed in times of need or response. Rationing during war, stopping the use of extremely toxic, detrimental chemicals in the open environment, etc. Also, I think it is amusing how the author distances himself from the whole thing ("man is destructive, HE is evil") instead of saying WE. Like, what, everybody but him is some destructive, killing machine bent on eradicating ourselves? Gimme a break.