I agree that 'the climate stayed reasonably static' in comparison to the ice ages, which is what the above thread is discussing. But what's fascinating is that

I agree that 'the climate stayed reasonably static' in comparison to the ice ages, which is what the above thread is discussing. But what's fascinating is that the arrival of Europeans in the US is hypothesized by some to have led to a dramatic cooling event called the "Little Ice Age". Quoting from the wikipedia article: https://en.wikipedia.org/wiki/Little_Ice_Age#Decreased_human_populations https://en.wikipedia.org/wiki/Little_Ice_Age#Decreased_human... Other researchers have supported depopulation in the Americas as a factor and have asserted that humans cleared considerable amounts of forest to support agriculture in the Americas before the arrival of Europeans brought on a population collapse.[134][135] Richard Nevle, Robert Dull and colleagues further suggested that not only anthropogenic forest clearance played a role in reducing the amount of carbon sequestered in Neotropical forests but also that human-set fires played a central role in reducing biomass in Amazonian and Central American forests before the arrival of the Europeans and the concomitant spread of diseases during the Columbian exchange.[136][137][138] Dull and Nevle calculated that reforestation in the tropical biomes of the Americas alone from 1500 to 1650 accounted for net carbon sequestration of 2-5 Pg.[137] Brierley conjectured that the European arrival in the Americas caused mass deaths from epidemic disease, which caused much abandonment of farmland. That caused much forest to return, which sequestered greater levels of carbon dioxide.