> Humans are likely responsible ... he mass extinctions
> coincided with both the end of the last Ice Age and
> the arrival of humans in the Americas ...
So, not just any "humans", but Native Americans.
They need to trot out that old environmental ad featuring
the chief with a tear rolling down his cheek, with a new
voice-over saying: "Oops. Sorry."
Needless to say, the professional acitivsts among them hate this theory. See, they were a peaceful people living in harmony with their environment, before Whitey came.
The fact is, the biggest ecological disaster for Australia was the arrival of the aborigines; the biggest for New Zealand was the arrival of the Maoris; the biggest for Hawaii the arrival of the Native Hawaiians. By the time Europeans arrived here and to those places, there wasn't a whole lot left to despoil.
"So, not just any "humans", but Native Americans"
I'll second this one.
Chalk this one up to the "No Duh" category of anthropology.
Humans have a major impact on their environments, and always have.
Or just saying "Burp!!"