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An over population  greatly affect the environment a result of loss of habitat ,degradation that has accelerated the rate of extinction. and also desertification the result of human activities, this desertification is the expansion of degraded soil.
the increasing of population are factors that further increased irrigation. this irrigation  alter the land and as a result of diminish resources.

as the number of population increase a pollution and loss of habitats, erosion,
 climate change, desertification, deforestation, will raise.