I do not pretend that birth control is the only way in which population can be kept from increasing. ... War, as I remarked a moment ago, has hitherto been disappointing in this respect, but perhaps bacteriological war may prove more effective. If Black Death could be spread throughout the world once in every generation survivors could procreate freely without making the world to full. ... The state of affairs might be somewhat unplesant, but what of that? - Bertrand Russell