[scouse]

extremely lethal disease, brought over by humans

Of course...of course...it had to be humans. I can't for the life of me understand why I didn't see it before.

[Black Agnes]

Yes, it was humans. However, this might put the lie to the whole myth of the benevolent natives who did nature no harm until the white man appeared...On the downside, it would appear to assist the 'humans are evil no matter what' VHEMT goobers.

[Ole Okie]

Of course...of course...it had to be humans. I can't for the life of me understand why I didn't see it before.

It's simple.

Humans brought internal combustion engines, the exhaust of which warmed things so much that the ice age wooly mammoths sweat to death.

Or possibly mammoth flatulence (barf!) caused a greenhouse effect which heated things up so much the mammoths sweat to death.

Or.........whatever.