Sophia Kianni (an haife ta a ranar 13 ga watan Disamban, shekara ta 2001) wata Ba'amurkiya ce mai fafutukar sauyin yanayi wacce ta kware a fannin yada labarai da dabaru. Ita ce ta kafa kuma babban darakta na Cardinal Climate, wata ƙungiyar ba da agaji ta matasa da ke jagorantar fassarar bayanai game da canjin yanayi zuwa sama da harsuna sama da 100. Tana wakiltar Amurka ne a matsayinta na ƙarami memba a Advisungiyar Shawarar Matasa ta Sakatare Janar na Majalisar Dinkin Duniya kan Canjin Yanayi. Ta kuma yi aiki a matsayinta na mai tsara dabarun kasa don ranakun Juma'a don Gabatarwa, mai magana da yawun kasa da kasa na Rikicin Kashewa, da kuma mai kula da hadin gwiwar kasa na Wannan shine Zero Hour. Kianni ta fara sha'awar gwagwarmayar yanayi ne yayin da take makarantar sakandare a Tehran, lokacin da wani dare ya rufe taurari da hayaki, kuma "alama ce ta cewa duniyarmu tana zafafa cikin yanayi mai ban tsoro". Daga baya ta shiga ƙungiyar Greta Thunberg, Juma'a don Gabatarwa, kuma za ta ɗauki hutu daga aji don tallafawa aiki kan canjin yanayi.