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Déserts et désertification
durée : 00:54:42 - La Terre au carré - A l'échelle du globe, les déserts occupent une part importante de la surface totale des terres émergées. Climat changeant et pression anthropique favorisent d'autant plus leur expansion. Petit à petit, des initiatives voient le jour pour inverser la tendance. Que connaît-t-on de ces zones hostiles à l'être humain ?