I really believe that as the population grows and people feel more and more ontop of each other and resources become more scares, unless we find a plausible we of spreading our population outward (into space) we are going to be witness to a massive war/collapse of society. This scares me because I will either be forced into a terribleife of kill or be killed in some form of conscription or I'll be too old to fight and I'll have to sit back and watch as the future of humanity is decided by those younger than myself with weapons in their hands.