Demography: The Heat Limit

Are the earth's cities getting too crowded, spreading their swarming fringes over the suburban countryside? Are highways too jammed, streams too polluted? Is the world's population explosion threatening to smother India and China under a near-solid mass of humanity? Pessimists who are wrought up about such present-day conditions, says British Physicist John H. Frem-1m, have seen nothing yet. Fremlin has sturdy faith that man's ingenuity will be equal to his ever-growing need for food. But this is just the trouble. Eventually, he says, the earth will be so packed with human bodies that the heat they give off will...

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