Abantu bomhlaba bafinyelela nini kubantu abayizigidi eziyizinkulungwane ezingu-8?
Context:I - UN yalinganisela ukuthi inani labantu emhlabeni lafinyelela isigidigidi okokuqala ngo - 1804. Kwathatha eminye iminyaka engu-123 ngaphambi kokuba ifinyelele ezigidini eziyizinkulungwane ezimbili ngo-1927, kodwa kwathatha iminyaka engu-33 kuphela ukuba ifinyelele ezigidini eziyizinkulungwane ezintathu ngo-1960. Ngemva kwalokho, kwathatha iminyaka engu - 14 ukuba inani labantu emhlabeni wonke lifinyelele ezigidini eziyizinkulungwane ezine ngo - 1974, iminyaka engu - 13 ukuba lifinyelele ezigidini eziyizinkulungwane ezinhlanu ngo - 1987, iminyaka engu - 12 ukuba lifinyelele ezigidini eziyizinkulungwane eziyisithupha ngo - 1999 futhi, ngokombiko we - United States Census Bureau, kwathatha iminyaka engu - 13 ukuba lifinyelele ezigidini eziyizinkulungwane eziyisikhombisa ngo - March 2012. Nokho, iZizwe Ezihlangene zilinganisela ukuthi inani labantu emhlabeni lafinyelela ezigidini eziyizinkulungwane eziyisikhombisa ngo-October 2011.  Ngokwe-UN, inani labantu emhlabeni wonke lafinyelela ezigidini eziyizinkulungwane eziyisishiyagalombili ngo-November 2022, kodwa ngenxa yokuthi izinga lokukhula liyancipha, kuzothatha eminye iminyaka engu-15 ukufinyelela cishe ezigidini eziyizinkulungwane eziyisishiyagalolunye ngo-2037 neminyaka engu-20 ukufinyelela ezigidini eziyizinkulungwane eziyishumi ngo-2057. Ezinye izimo ezingaba khona ngo-2050 zihlukahluka kusukela enanini eliphansi lezigidi eziyizinkulungwane ezingu-7,4 kuya enanini eliphakeme elingaphezu kwezigidi eziyizinkulungwane ezingu-10,6. Amanani abikezelwayo ayahlukahluka kuye ngezibalo ezisetshenzisiwe kanye neziguquguqukayo ezisetshenziswe ekubalweni kokubikezela, ikakhulukazi iziguquguqukayo zokuzala nokufa. Izibikezelo zesikhathi eside ezifinyelela ku-2150, zihlukahluka kusukela ekuncipheni kwenani labantu libe yizigidi eziyizinkulungwane ezingu-3,2 "esimisweni esiphansi", kuye "ezimweni eziphakeme" eziba yizigidi eziyizinkulungwane ezingu-24,8. Esinye isimo esibi kakhulu sabikezela ukwanda okukhulu kuya ezigidini eziyizinkulungwane ezingu-256 ngonyaka ka-2150, kucatshangwa ukuthi izinga lokuzala emhlabeni wonke lahlala lisesilinganisweni salo sango-1995 sabantwana abangu-3.04 kowesifazane ngamunye; Nokho, ngo-2010 izinga lokuzala emhlabeni wonke lase lehle laya ku-2.52.  Akukho kulinganisela kosuku noma inyanga eqondile inani labantu emhlabeni eledlula ngayo isigidigidi esisodwa noma ezimbili. Amaphuzu lapho lafinyelela khona ezigidini eziyizinkulungwane ezintathu nezine awazange aqashelwe ngokusemthethweni, kodwa i-International Database ye-United States Census Bureau yawabeka ngo-July 1959 nango-April 1974 ngokulandelana. IZizwe Ezihlangene zakumisa futhi zakugubha "uSuku Lwezigidi Eziyizinkulungwane Ezinhlanu" ngoJulayi 11, 1987, "noSuku Lwezigidi Eziyizinkulungwane Eziyisithupha" ngo-October 12, 1999. UMnyango Wezakhamuzi weZizwe Ezihlangene wamemezela "Usuku Lwezigidi Eziyizinkulungwane Eziyisikhombisa" ngo-October 31, 2011. IZizwe Ezihlangene zigubhe usuku lokuzalwa komuntu wesigidi esiyizinkulungwane eziyisishiyagalombili ngomhlaka 15 Novemba 2022.
Ngokwe-UN, inani labantu emhlabeni lifinyelele ezigidini eziyizinkulungwane eziyisishiyagalombili ngoNovemba 2022