Ignorance about limitations to growth.
D000349:Africa; D001208:Asia; D001723:Birth Rate; D004787:Environmental Pollution; D005060:Europe; D005246:Feedback; D005523:Food Supply; D006801:Humans; D008962:Models, Theoretical; D009026:Mortality; D009656:North America; D011158:Population Growth; D013020:South America