“Human population growth is probably the single most serious long-term threat to survival. We're in for a major disaster if it isn't curbed... We have no option. If it isn't controlled voluntarily, it will be controlled involuntarily by an increase in disease, starvation and war.”

“‎Using his burgeoning intelligence, this most successful of all mammals has exploited the environment to produce food for an ever increasing population. Instead of controlling the environment for the benefit of the population, perhaps it's time we controlled the population to allow the survival of the environment.”

“[Some diseases] are probably always present in population 'resrvoirs'... and in times of malnutrition or other adverse conditions [manifest]... as population controls.”

“Either a species learns to control its own population, or something like disease, famine, war, will take care of the issue.”

“Wild animals almost never die of old age: starvation, disease, or predators catch up with them long before they become really senile. Until recently this was true of man too. Most animals die in childhood, many never get beyond the egg stage. Starvation and other causes of death are the ultimate reasons why populations cannot increase indefinitely.”

“Evolution isn't 'survival of the fittest,' for Christ's sake. In the long run, linearly, it's survival of the most prolific.”