Whakakī i te rerenga e whai ake nei: I te tau 2015, e rua ngā rōpū mātanga pūtaiao mana o UNFCCC i whakatau, "i ētahi rohe me ngā rauropi ngoikore, he nui ngā mōrearea e whakaarohia ana ahakoa he nui ake te mahana i te 1.5 °C". Ko tēnei tūnga mātanga, i te taha o te reo kaha ā-tuhipoka o ngā whenua rawakore me ngā motu o te Moananui-a-Kiwa, ko te kaha e arahi ana ki te whakatau a te Komiti o te Ao.
Ko te Hui i Paris 2015, hei whakatakoto i tēnei whāinga 1.5 °C wā roa i runga ake i te whāinga 2 °C o nāianei.