Remember the 40 to 60 million bison that used to roam the great plains of North America? They — along with the millions of deer, pronghorns, wolves and lesser beasts that once animated prairie ecosystems — have been “competitively displaced,” their habitats taken over by a much greater biomass of humans, cattle, pigs and sheep. And not just North Americans — Great Plains sunshine also supports millions of other people-with-livestock around world who depend, in part on North American grain, oil-seed, pulse and meat exports.
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