Title: Losing ground
Subjects: Food supply, Environmental aspects of Agriculture, Environmental aspects, Agriculture, Soil erosion, Influence on nature, Human beings, Nature, Effect of human beings on, Man, Influencia sobre la naturaleza, Suelos, Hombre, Erosión, Ecología agrícola, Agricultural ecology, ECOLOGY, FOOD, Soils and soil erosion, Reclamation, Nature, effect of human beings on