The Intergovernmental Panel on Climate Change (IPCC), the United Nation's climate science research group, concluded in a major report that it is "unequivocal" that humans have warmed the skies, waters, and lands, and that "widespread and rapid changes" have already occurred in every inhabited region across the globe. Many of these changes are irreversible within our lifetime.
Irafan, Umair., Leber, Rebecca. 2021. "The devastating new UN report on climate change, explained" Vox. August 9, 2021.