Abstract
There are estimated to be 2,077,000,000 people now alive at a given moment on the 51,104,000 square miles of the continents, subcontinents and islands which constitute the earth’s inhabited land surface. They make extensive use of the 144,478,000 square miles of the world’s water area. Within the past century the living generations have come to control the entire surface of the earth with substantial completeness through the mechanisms of society which they have created; but they do not even yet utilize its land areas fully.

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