Soil erosion is the major cause of devastation of land. It is a “quiet crisis” in both national and global economies. Impelled by both population pressure and shortage of food, people excluded from flat lands downstream, living on slash-and-burn cultivation (shifting cultivation), are forced to live at higher elevations on upstream slopes. This causes deforestation, which leads to soil erosion, in the tropics. Population pressure drives the conversion of the forest into agricultural land. More grassland and forest are being forcibly opened to food production and are exposed to soil erosion. This stress accelerates the deforestation trend and leads to the loss of fertile soil. Soil erosion causes not only transport of soil and land degradation that results in diminished productivity of upland farming, but also sedimentation or siltation of river systems, lakes, and reservoirs, damaging people’s life and prosperity. Nevertheless, soil erosion is not a natural disaster like earthquakes, volcanic eruptions, or any other unavoidable natural hazards, but is man-made and avoidable.