If you doubt the Natives were violent, Francis Parkman, documents just how violent the Natives generally were in the US. A lot of tribes sided with the settlers because they treated them better than other natives.
Complete Works of Francis Parkman Jr. (Illustrated): (Ten Books with Illustrations) https://www.amazon.com/dp/B017UOL0QQ/ref=cm_sw_r_cp_api_glt_1ZC1G327D0TDYQZQ1Z0J
It doesn't help that it doesn't really matter what studies say; very few people would actually go back and read the actual paper, or even the abstract. Heck, a decent amount of people don't read past news headlines.
If you are interested in reading those studies, however, sci-hub can probably help you get past paywalls.
The science of climate change isn't settled at all (at least not how it is advertised by the corporate media and leftist hippies in general). See, e.g., Lomborg 2020 and Koonin 2021.