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Jeeps wait at a Lake Chad port to take people and cargo from boats to a nearby market. With declining waters and increasing population, fish stocks have declined on Lake Chad. The lake is drying up, due largely to desertification as the Sahara advances southward. This advance is caused in part by global warming which has reduced rainfall in the region, weakening plants whose roots once held topsoil in place. Government sponsored irrigation schees, which pump water out of the lake, are also having a negative effect on water levels.