Half a century ago, human geography claimed it had established the rules of durable relation ship between human populations and their environment, such rules being easy to apply anywhere and to be mapped by an universal cartography. Contemporary changes have burst such an illusion, and human geography has now to work upon perpetually changing data pertaining to various social sciences and evolving and different rythms. And thence to distinguish conjunctural short-term tendencies and long-term structural changes.La géographie humaine a prétendu, il y a un demi-siècle, définir les règles des rapports stables entre population et milieu, règles applicables partout et se prêtant à une représentation cartographique universelle. Les mutations cont...