Wars & In demographics, the world population is the total number of humans currently living, and was estimated to have reached 7,800,000,000 people as of March 2020[update]. Alternative scenarios for 2050 range from a low of 7.4 billion to a high of more than 10.6 billion. [142], In 2004, a meta-analysis of 70 quantitative studies estimating a sustainable limit to the world population generated a meta-estimate of 7.7 billion people. [160][161] [130] HISTORY DICTIONARY          People in History D - F Battles A - C In 1968, Paul R. Ehrlich reprised Malthus' argument in The Population Bomb, predicting that mass global famine would occur in the 1970s and 1980s. By contrast, it is estimated that around 50–60 million people lived in the combined eastern and western Roman Empire in the 4th century AD. [64][65] Between the 1920s and 2000s, Kenya's population grew from 2.9 million to 37 million. Combien d'humains ont-ils vécu sur Terre depuis l'apparition de l'espèce Homo sapiens? Le Bureau du Recensement des États-Unis, qui relève les limites méthodologiques de la problématique, en estimant que pour 99 % de la population historique, il n'y a pas de recensement, arrive toutefois à un total d'environ 110 milliards jusqu'en 2011 (en prenant -50000 comme point de départ, ainsi que des données de fécondité à partir de -8000 estimées à 80 pour mille, diminuant progressivement jusqu'aux taux connus aujourd'hui). Historic People - Main MAPS:  Eu-Ez ARCHAEOLOGICAL RECORDS, HOME   -   The densest populations are settled in the industrial areas. Ehrlich places the optimum global population size at 1.5 to 2 billion people. [120][121] 2003 UN Population Division population projections for the year 2150 range between 3.2 and 24.8 billion. The points at which it reached three and four billion were not officially noted, but the International Database of the United States Census Bureau placed them in July 1959 and April 1974 respectively. ASIA MAPS: Some of China's population rose from approximately 430 million in 1850 to 580 million in 1953,[60] and now stands at over 1.3 billion. Répondre à cette question pose divers problèmes méthodologiques. Pour le démographe, se projeter à échelle mondiale au-delà de 50 ans est un exercice très difficile. An 0 : 170 à 400 millions. The University of Texas at

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