Ten thousand years ago, human beings devised the techniques of agriculture and herding and slowly begin the… — Isaac Asimov

Ten thousand years ago, human beings devised the techniques of agriculture and herding and slowly begin the process of destroying the environment by overgrazing and by overfarming.

Still, not all that human beings could do in the wildest excesses of war and rapine could seriously damage the planet until 1945. In that year, the first nuclear bomb was exploded, and the Industrial Revolution, fed by cheap oil, went into high gear. We are now perfectly capable of damaging the planet beyond repair in any reasonable time, and are, in fact, in the process of doing so.

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