It seems most likely that there was a bolide impact(or several) circa 12-13kybp which triggered the younger dryas cold snap. It also seems most likely that this impact set off raging wildfires that may have consumed over 10 percent of the world's biomass. This seems to have been followed by a multi year winter. And may have caused the extinction of the megafauna and the die0off of the north american humans. https://www.journals.uchicago.edu/doi/abs/10.1086/695703?mobileUi=0&journalCode=jg https://news.ku.edu/2018/01/30/new-...-human-beings-witnessed-fires-larger-dinosaur https://sacredgeometryinternational.com/wp-content/uploads/2018/02/Wolbach-2018-Fire-Part-1-MS.pdf https://www.researchgate.net/public...pact_12800_Years_Ago_1_Ice_Cores_and_Glaciers OK' Question agree? or not? and why?