When and how do you believe the world will end? assuming it will

I think the world will end with nuclear detonation. It can be war, or it can be a teenage skid inside his closet that managed to tap into a grid that manages nuclear warheads. Either or, nuclear fire will be the end of us. You reach that point in human advancement that you really cannot go back unfortunately. Once you create something as powerful as nuclear technology, over the years it will become easier and more easily accessible. I mean just look at North Korea! If they can do it, give or take 200 more years, and you have 13 year olds running around with sticks made of Uranium. You know what else followed this exact trend? PHONES. Every kid has a phone now a days, I even see toddlers with iPads in their hands when during my time, CEO's of large companies owned Blackberries.