Species Extinction

Extinction is a subject in which I really do not think about to often. Sure, it's a horrible thought to think a species of bird is out there on its last leg but it's just a depressing subject. Nature has it's way of extinction through natural selection but, humans also have a huge impact. Humans seem to be selfish ignorant people when it comes to extinction. When we look around we see so many of one species that it seems almost physically impossible to kill every last one. Well...it has happened in many cases. So saying humans don't have an impact on human extinction would be a lie.