Oddly enough, my father and I were talking about this same subject, in one form of another. He remembers watching sci fi movies from the 70's, and recalling that such themes were way out there. But now those same themes are becoming reality.
Case in point, regardless of agenda, political or religious, the earth is becoming over populated. We need to realize that if we continue this way, we will end the human race as we know it. For example: if there is only food for 3000 deer, but there is 10000 deer, the total deer populate will consume the food it needs. Same as humans, we will extinct ourselves to death, unless we face reality. Soylent Green!