[MoJoWork_n]

What they’re saying there is that *right along with* the re-forestation and (possible) increased CO2 levels, there may also have been “....a decrease in solar activity, an increase in volcanic activity or colder oceans capable of absorbing more carbon dioxide.....” All of which would be completely unrelated to the disappearing Native Americans suspected root cause.

...Actually, I don’t know that a few parts per million of CO2 are necessarily such a horrible thing (6 to 10 parts per million, to be precise), but what seems to have gotten everyone so wound up — besides the drop in average temperature of a few degrees — is the suggestion that there were many, many, many people (anywhere between 40 and 100 million of them) whose relatively sudden disappearance may have affected the the climate of the whole planet.

[count-your-change]

The idea that 40 to 100 million people were living in North America seems rather ludicrous considering the population of the U.S. was less than 100 million in 1910.
But postulating some outlandish number must somehow satisfy the PC view of the natives being being happy and numerous until the evil white men came.

Bring back the Italian guy pretending to an Indian, he was good for a laugh.