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Over 50 percent of the global land surface consists of mostly arid, but also too cold, too steep or too high-altitude areas where cereal, fruit and vegetable cultivation are not sustainable. These steppes and grass savannahs are very often used as grazing land. Even in earlier times, pastoralism, especially when it was nomadic in nature, was less valued than agriculture. Historically, agriculture – and with it, sedentary life...