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People harvest chilli peppers at a farm irrigated with water from the Yobe River. The Yobe River feeds Lake Chad, which 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, and feeder rivers such as the Yobe, are also having a negative effect on water levels. Many of these irrigation schemes are for farms growing hot peppers. The peppers, a key ingredient in Nigerian food, command a high price but demand much water.