So, this is a thought experiment.
The worldwide human population has some potential looming problems. War, climate threats and, likely, overpopulation which brings with it problems like epidemics and famine.
Suppose that you got total power to change the political situation anywhere in the world. What would you do in order to ensure mankind's survival into the future?
Of course, the details of any real "solution" to all this could take the minds of many smartypants to figure out and certainly more space than you get in a post to write down, so you don't have to sort out the solutions to all out problems in one post or be meticulous with details. But let's see some suggestions for change.
