One species—Homo sapiens—consumes nearly a quarter of Earth's natural productivity
Some people live lightly on the land: Bedouin clans roam the deserts of the Middle East and North Africa; small groups of indigenous people follow reindeer herds across frigid Arctic terrain; and tribes of hunter-gatherers forage the plains of southern Africa and the forests of Amazonia and Papua New Guinea.
Then there's the other 6.6 billion of us.
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