ww3 will be nuclear in all likelihood and will result in the near death of humanity as a race. we will cause nuclear winter along with yellowstone erupting and devastating fault shifts. we will enter a dark age where the only possible way to have technology reinstated would be for us to have very luckily hid away the perfect artisan of every necessary modern field. there will be a massive supply shortage, and evolution will most likely be forced upon us and wildlife while we bear the after affects of radiation on our environment. it won't be quite like fallout, but new subspecies with adaptations will most likely pop up in a single lifetime. temperatures will see some form of drastic change and we may enter a complete ice age. but yeah like ww3 sounds lit i guess, like imma be fine bro