Kukamba za zimene chikhalidwe cha kudzitsitsa wakhala ukupitirira kwa zaka zambiri. Komatu mu 70s wa atumwi wotsiriza kwa kusanthula nkhani iyi anayamba kubwera ku mfundo zomveka maganizo. Nthawi imeneyi, pafupifupi m'mayiko onse otukuka anakhazikitsako nyumba wapadera, amene anali ndi udindo kuthana ndi mavuto a zachilengedwe chikhalidwe. Izo pa mfundo iyi, kuwonongeka kwa chilengedwe zafika pamlingo wotere kotero kuti amanyalanyaza zochitika zoipa anakhala zosatheka. Tikumbukenso kuti m'zaka zapitazo, m'dera masoka zachilengedwe zachitika mu maiko osiyanasiyana ndipo m'madera osiyana.
Kumene, vutoli amadziwika kuti anthu kwa nthawi yaitali. Ngati mukufuna kudziwa chimene chili kudzitsitsa m'njira inayake, mayankho adzakhala osiyana. Kale mu chitukuko wakale wa alimi akukumana ndi vuto la wakuta nthaka. Pamene kochitika mwachisawawa ulimi kwa zaka zingapo munda yafupika zokolola zawo zizindikiro yovuta. Anthu sakanachitira mwina, momwe kusamukira ku malo ena ndi kuyamba onse kachiwiri. Njira imeneyi imagwira kupulumuka, mwinamwake icho dzina, ankagwiritsa ntchito yaitali nthawi zakale. Komabe, ndi kukula kwa chiwerengero cha anthu olimapo sikunali kokwanira.
Malinga ndi asayansi a ku Britain, mu 1750 anthu dziko akwanira 500 miliyoni zokha. Man. Mu 2002, anthu anayamba zoposa biliyoni 6. Pofika chaka chakhumi ndi chitatu chithunzi ichi adzakhala upambana biliyoni 7. kuwonjezeka kotereku zachiwawa ukasintha amasintha khalidwe la malo okhala. Munthu aliyense amabadwa kumlingo amadwala, kodi kuwononga malo okhala. Masiku ano, anthu ambiri m'madera amene kuli anthu a ku Ulaya, Asia ndi Africa vuto pachimake popereka kumwa madzi kwa anthu. Nthawiyi, mitsinje adzauma chifukwa chakuti pali tima chodula mitengo.
Malinga anapezazo, zimene anachita mothandizidwa ndi mawerengeredwe masamu, nkhalango chivundikiro m'dzikoli anatsika ndi pafupifupi 50% poyerekeza index, imene inali zaka zikwi zisanu zapitazo. Lero, Nkhalango wogwetsedwawo mofulumira. Zimenezi zimachititsa kuti kudzitsitsa mofulumira a dziko nyama. Nyama anazimiririka modetsa nkhawa. Kuti zodabwitsazi m'pofunika kuwonjezera chakuti voliyumu ya zinyalala ya anthu komanso anawonjezeka mofulumira. Mophiphiritsa, dziko lathuli ndi pang'onopang'ono kutembenukira mu dustbin chachikulu. mavuto onsewa simungakhoze kusokoneza mbali pang'onopang'ono kwa anthu, ndi miyeso zina atengedwa kale.
Pa nthawi ino, pamene anthu ambiri ndi kale ikuimira chilengedwe kudzitsitsa anayamba zosiyanasiyana mapulogalamu kusintha zinthu zikusinthira. Pa UN anakhazikitsa dongosolo lapadera, amene amachititsa ntchito yaikulu umenewu. Tinatsegula mabungwe osiyanasiyana chenjezo ndi komishoni kuti amayang'anitsitsa ntchito yatsopano analenga ndi ntchito ndi makampani alipo. The Anthu odziwika bwino zachilengedwe Greenpeace amachititsa anaziika ndi kukachita tione mbali zonse vuto. Pali zifukwa kukhulupirira kuti anthu adzapeza njira yothetsera zimenezi.