Dan Adam niche yanayi
Yanayin ɗan adam; shine tarin yanayin yanayin da ya cigaba da rayuwar ɗan adam da ayyukan ɗan adam, kamar noma, a duniya har tsawon shekaru dubu da suka gabata. An ƙiyasta yanayin ɗan adam ta hanyar ƙididdige yawan adadin ɗan adam dangane da ma'anar zafin rana.[1][2] Rarraba yawan jama'a a matsayin aiki na matsakaicin zafin jiki na shekara, shine bimodal kuma yana haifar da hanyoyi guda biyu; daya a 15 °C da kuma wani a~20 zuwa 25 °C.[2] Amfanin amfanin gona da dabbobin da ake buƙata don ɗorewa yawan jama'ar ɗan adam suma suna iyakance ga irin wannan yanayin. Idan aka yi la’akari da hauhawar yanayin zafi a duniya, ana hasashen yawan ɗan adam zai fuskanci yanayin yanayi fiyeda yanayin yanayin ɗan adam. Wasu hasashe sun nuna cewa idan aka yi la'akari da yanayin zafi da sauye-sauyen al'umma, mutane biliyan 2.0 da biliyan 3.7 za su rayu daga cikin ma'auni nan da 2030 da 2090, bi da bi.[2]
