IIRC, many Native American cultures practiced large scale controlled burning of prairies and forests in North America. So yeah, you'd expect that after their so

IIRC, many Native American cultures practiced large scale controlled burning of prairies and forests in North America. So yeah, you'd expect that after their societies collapsed, their massive CO2 emissions would disappear. Interesting to see people in the comments who have no idea about pre-Colombian history in the Americas.