Opening paragraphs...............

 In the beginning we were wanderers.

     We didn't wander because we trying to find ourselves, we wandered because we were HONGRY.  We wandered with the seasons to places with more abundant roots, nuts, and berries,  We wandered up and down elevation bands to forage for different plants.  We followed the animal migrations because that's where the steaks were.  What passed for shelter was what you could find when you needed it.  Typically, we would not stay in the same place for more than a few weeks because we'd forage and hunt the yard to nothing in no time.  Our stomachs would force us to start wandering anew.

     The limitations of it all were pretty, well, limiting.  The only power source an unaided human has are muscles, first our own and later that of a handful of animals that we could tame.  Starvation, disease, and injury were common and had the unfortunately high likelihood of proving lethal.  And any provided-by-nature root or rabbit that you ate was one that someone else would not be eating.  So, sure, we lived in "harmony with nature" . . . which is another way of saying we tended to beat the crap out of our neighbors whenever we saw them.

-Peter Zeihan, The End of the World Is Just the Beginning: Mapping the Collapse of Globalization