Long before humans there was climate change. The carbon taxers argument is that Humans are causing climate change. The Sun and Earth dynamic is 99% responsible for it. The 1% that humans cause is like a tiny ant hill compared to the size of the Earth.
>IT WASN'T OUR ANCESTORS that caused the extinction of ancient animals, it was environmental change.
>Researchers are dispelling the long-held belief that early, tool-bearing humans caused the extinction of the giant mammals in Africa over the last several million years and are arguing that it was a long-term change to their environment.
https://www.usnews.com/news/world/articles/2018-11-22/study-environmental-change-not-humans-caused-extinction-of-large-ancient-mammals