Explain What Is The Single Greatest Threat To The Survival Of The Human Race

In answer to the question, “What is the single greatest threat to the survival of the human race?”, I would have to say… OURSELVES!!! Dramatic don't you think? We are all poisoning ourselves. But I’m not just the adults who drink alcohol. For every tree we cut we are letting the environment produce less air, for every animal we kill we are closer to their extinction, for every SUV we drive we are killing our ozone, and for every horrid and mean thing we do to another human we may very well have inspired them to “hit back”. We are the only creature in the animal kingdom known to kill for no good reason. All other animals kill for dominance or food. Not humans. We say that we are civilized but are we really!?!?!? How much better could we possibly