I've been thinking about it and I think I have a good theory on he end of the human species and the world will play out terrorists will want to kill the civilized countries without killing themselves so they'll probably go with biological warfare and send. It over most of earths population will be wiped out due to the mutating of the pathogen . This includes the terrorists. Once the the human species is extinct other animals will flourish and evolve but after some time the human killing pathogen possibly others as well will mutate and kill most land life leaving only a water world where the land is hostile and full of bacteria , viruses fungi and bugs ( possibly some small land vertebrates but not many ) and the earth will end as it it began . But what do you think ? Tell me your ideas!