One more is the end of the world...

So, I'm sitting here working on my novel when I read an article on how the production of nitrates, or more specifically, now synthesizing ammonia, known as the Haber-Bosch process, shaped the subsequent course of world history. i.e., enabling, through increased food production, world population to quadruple from 1.6 billion to 6.4 billion in the 20th Century. Then, I began to wonder what if we had too many people. How many can the world hold before the weight is too great, and one more will cause the earth to began plummeting or soaring, or whatever it will be called, into a different place in space, maybe another solar system. What if you or I are identified as the one who has to go, and then, it begs the question, where would we go? I hope it isn't me, and I hope I don't have to pick the departing one, like a terrestrial Sophie's Choice, because it might have to be you.