دانشگاه شهید بهشتی، تهران، ایران.
عنوان مقاله [English]
The great ecosystems of the world are so exposed to destruction that this has become the biggest problem of human societies. The following figures are alarming: 25-50% of plant and animal species will disappear before the end of the current century. Forests are decreasing in size and deserts are expanding. Erosion destroys fertile soils. Global warming has devastating effects on the environment. Theodore Roosevelt said in 1959: If the present generation continues to destroy resources, there will be nothing left for our children. Before him, Malthus in the 18th century proposed the relationship between population growth and food resources. These and other concerns formed the basis for the formation of the activities of the greens and other non-governmental organizations in favor of ecology in Europe. Today's geographers cannot tolerate what is happening to the earth's environment. Damage to air, water, soil and vegetation forces geographers to adopt a different and more moderate view of the world. Although they have a different opinion regarding the data that ecologists have about the damage caused by human activities, but this problem is serious enough to provide the necessary foundations for future geographic analysis.