In article ,
John Larkin wrote:
[....]
Central USA was once a tropical jungle, and it was once scoured by
glaciers, with no help from us.

I estimate that it takes about 63 Million years for a species to evolve
that invents the SUV. :

But really, things changing without our action doesn't prove that our
action doesn't cause change. If we can make the difference between
slightly bad times and bye-bye mankind, I think we should make a choice.

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forging knowledge