Dan Adam niche yanayi
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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]
![Changes in relative human population density with respect to mean annual temperature](http://upload.wikimedia.org/wikipedia/commons/thumb/3/37/Lenton_2023_human_population_density_vs_temperature.png/220px-Lenton_2023_human_population_density_vs_temperature.png)