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For most of our history, humans were not very numerous. Studies of hunting and gathering societies suggest that the total world population was probably only a few million people before the invention of agriculture and the domestication of animals around 10,000 years ago. The agricultural revolution produced a larger and more secure food supply and allowed the human population to grow, reaching perhaps 50 million by 5000 B.C. For thousands of years, the number of humans increased very slowly. Hum

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