Title not available in English.

Abstract

Students of migration have always included environmental considerations in their search for explanations of the determinants and consequences of population movements. Ravenstein, as well as geographers and economists who developed models of the location of economic activities, identified natural resources and geographic features as basic factors. Contemporary environmental research, however, poses a new dimension for migration studies. Absolute limits to natural resources and the disappearance of the last frontiers reduce the degrees of freedom for population movements. Population mobility takes on different meanings when viewed from this perspective.