Kolik je na světě vlastně lidí?

13. června 2008 v 11:11 | janča |  Je na světě víc mužů nebo žen?
Podle nejnovější údajů OSN žije dnes na Zemi více mužů než žen. Z celkového počtu lidí na naší planetě - 6.670.581.000 - bylo 3.354.241.000 obyvatel mužského pohlaví a 3.316.340.000 ženského pohlaví. Nevyrovnaný poměr je prý už při narození: na 100 narozených děvčátek připadá asi 105 chlapců.

S narůstajícím věkem se však čísla mění uvintř věkových skupin: muži se totiž dožívají v průměru nižšího věku a umírají dříve. U staršího obyvatelstva s relativně vysokým podílem starých lidí - jako například v Evropě - je proto více žen než mužů.

Mimochodem, kolik lidí už žilo na Zemi? To se nedá přesně spocítat, protože přesná data o velikosti a vývoj populace jsou k dispozici teprve od minulého století. Na zakladě odhadů je pravděpodobné, že doposud žily asi 106 miliardy lidí. V současnosti obývá Zemi kolem 6 % všech lidí, kteří se kdy narodili.

Pro výpočet je zásadní rozhodnutí, od kterého bodu prehistorického vývoje Homo Sapiens se dá mluvit o "člověku" v dnešním slova smyslu. OSN klade mezník na 50.000 let před narozením Krista. Dále se odhaduje, že okolo roku 8.000 před Kristem žilo asi 5 milionů lidí. V roce narození Krista stoupl tento počet asi na 300 milionů lidí.

Až do počátku novověku rostl počet obyvatel světa jen velmi pomalu a kolem roku 1650 dosáhl podle odhadu asi 500 milionů. Nejpozději začatkem 20. století se nárůst počtu obyvatel razantně zrychlil. Ve 20. století se počet obyvatel na světě znásobil téměř 4krát: z 1.6 miliardy v roce 1900 na více než 6 miliardy v současnosti.

Když jsem se narodil, moje země - Brazílie - měla 90 milionů obyvatel. Teď máme 185 milionů!
 

23 lidí ohodnotilo tento článek.

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