ww4 will be fought with sticks and stones! by mutant sentient cockroaches! won't be by us... that's for sure... we may be an adaptable and quasi-innovative species... but we are not a hardy species... if we start on ww3... the use of nuclear, chemical, emp, biologic, genetic, climatic, and many other methods of hurting ourselves... I don't even give us betting odds on making it to ww4.