La tierra

Land Degradation

Land degradation is a concept in which the value of the biophysical environment is affected by one or more combination of human-induced processes acting upon the land. It isviewed as any change or disturbance to the land perceived to be deleterious or undesirable.Natural hazards are excluded as a cause, however human activities can indirectly affect phenomena such as floodsand bushfires.
It is estimated that up to 40% of the world's agricultural land is seriously degraded.

Land Pollution

Land pollution is the degradation of Earth's land surfaces often caused byhuman activities and their misuse of land resources. It occurs when waste is not disposed properly. Health hazard disposal of urban and industrial wastes, exploitation of minerals, and improper use ofsoil by inadequate agricultural practices are a few factors. Urbanization and industrialization are major causes of land pollution. The Industrial Revolution set a series of events into motion whichdestroyed natural habitats and polluted the environment, causing diseases in both humans and other species of animals.
Soil degradation
Soil retrogression and degradation are two regressive evolutionprocesses associated with the loss of equilibrium of a stable soil. Retrogression is primarily due to erosion and corresponds to a phenomenon where succession reverts back to pioneer conditions (suchas bare ground). Degradation is an evolution, different of natural evolution, related to the locale climate and vegetation. It is due to the replacement of the primitive vegetation (known as climax)by a secondary vegetation. This replacement modifies the humus composition and amount, and impacts the formation of the soil. It is directly related to human activity. Soil degradation may also beviewed as any change or disturbance to the soil perceived to be deleterious or undesirable.
Soil conservation
Soil conservation is a set of management strategies for prevention of soil being eroded...