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Prairies feed the world. Over thousands of years, humans have learned to cultivate prairies and domesticate the animals that live there. The success of this operation has brought the population to the current seven billion. But it has not been all roses and flowers for the men of the prairies . Even if they are less hostile places than glaciers and deserts, living on the steppes of Mongolia or the plains of Kenya is not a walk in the park and still requires skill, a spirit of adaptation and collaboration with other living creatures. Prairies: another extraordinary documentary from the BBC Human Planet series. The Roman civilization has left behind monuments, temples and extraordinary works of engineering . By digging, as from a mine, remarkable finds continue to emerge and sometimes even the remains of monumental complexes.