Nuclear war will not be enough to cause human extinction. The targets are likely to be focused on nuclear powers which leaves many areas of the world untouched:

Nuclear war will not be enough to cause human extinction. The targets are likely to be focused on nuclear powers which leaves many areas of the world untouched: e.g. South America and Africa. Life will definitely be quite unpleasant for the remaining humans but it will not cause the world population to drop to 0. I am much more concerned about biological weapons which do have the potential to cause absolute human extinction.