You mean the Cahokian cultural demise which included vast swaths of denuded, untended, abandoned agricultural land wasn’t a problem, but a bunch of colonists were?
Oh yes, those evil whites!
The Cahokian folks may have just run out of logs to burn.
But that was only a century or so before Columbus, so the trees that grew back after the collapse of that culture would have added to the ‘too much CO2’ problem, a little earlier on but more or less compounding the same ‘too many trees, not enough Native Americans’ issue.