The countries of Northern Africa, Asia, and Australia use a larger percentage of their water withdrawal for agriculture as compared to others mainly because they have cool climate and so there is less humidity in the air and they need to pick more water-efficient crops to grow in.
There are several countries across South Asia and Africa which use more than 90 percent of the water withdrawals for agriculture. The problem also stems from the uneven distribution of rainfall.
Agriculture is the largest consumer of water in sub-Saharan Africa and a rapidly rising population is increasing food demand and water scarcity. Irrigation is a widespread practice required in many areas of Australia.
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