Njengomphumela wezifundo zesimiso sonozungezilanga neplanethi yethu, ososayensi sebenqume ukuthi okwamanje usengcupheni usongo lokupholisa umhlaba wonke. Le nkinga ilele ohlelweni lokupholisa kancane kancane ukuqina komhlaba, ngenxa yalokho izinga lokushisa lonyaka lehla ngamazinga ambalwa. Uma kwenzeka inhlekelele yesimo sezulu, iplanethi ingabanda, njengoba kwenzeka ngesikhathi se-Ice Age.
Umlando wenkinga yokupholisa komhlaba
Isikhathi sokupholisa umhlaba wonke sagcina emhlabeni ngekhulu le-17. Ngaleso sikhathi, amazinga okushisa ehla emazingeni aphansi ngendlela emangalisayo. Ukubonakaliswa kokuqala kokupholisa komhlaba kwaqoshwa usosayensi waseNgilandi, futhi ukumdumisa le nkathi yaqanjwa ngokuthi "ubuncane beMaunder", eyaqala kusukela ngo-1645-1715. Ngokusho kofakazi bokuzibonela, kwaqubuka ngisho noMfula iThames.
Ngawo-1940s-1970s, kwabusa umbono wokupholisa umhlaba wonke. Ngenkathi, ngenxa yentuthuko yezomnotho esheshayo nomsebenzi wezimboni, izinga lokushisa lomoya liqala ukukhuphuka ngokushesha, ososayensi baqala ukukhuluma ngokufudumala komhlaba. Ngokushesha, le mbono yaqala ukuxoxwa kakhulu, futhi ulwazi lwafinyelela kubantu abavamile. Ngakho-ke, imfundiso yokuziphendukela okubandayo yayikhohliwe isikhathi esithile.
Isimo samanje senkinga
Ochwepheshe baphinde bakhuluma ngengozi yobusika benuzi lapho kuvela usongo lokuhlaselwa kwenuzi emadolobheni. Ngaphezu kwalokho, manje le mbono iqinisekiswa ngucwaningo olusha lososayensi. Bathole izindawo ezithile ezimnyama elangeni, kwathi ngonyaka ka-2030 kwaqala umjikelezo omusha welanga, kanye nokupholisa komhlaba. Lokhu kuzokwenzeka ngoba amagagasi amabili emisebe azokhombisa omunye nomunye, ngakho-ke uMhlaba awukwazi ukufudunyezwa ngamandla eLanga. Lapho-ke iplanethi ingasinda esikhathini esifushane esilandelayo "se-ice age". Kuzoba nesithwathwa esibi iminyaka eyishumi. Izazi zezinkanyezi zibikezela ukuthi izinga lokushisa komkhathi lizokwehla ngama-60%.
Iqembu labacwaningi limemezela ukuthi noma lokhu kusondela kubanda okubandayo, noma lokho okulindeleke esikhathini esizayo, abantu abakwazi ukuma. Ngenkathi abanye bekhathazekile ngokufudumala komhlaba, usongo lwe "ice age" lusondela kakhulu. Sekuyisikhathi sokuthenga izingubo ezifudumele, izifudumezi kanye nokusungula izindlela zokuphila ezimweni ezinzima zeqhwa eliphansi. Sincane kakhulu isikhathi esisele sokulungiselela amakhaza asondelayo. Kodwa-ke, lokhu kumane kucatshangwa ososayensi, imiphumela sizoyibona kungekudala.
