Another 20 percent of irrigated land is damaged by water logging or salinity, the agency says.
CNN: All About: Food and the environment
Half the irrigated land in the Sao Francisco valley is the product of public investment.
ECONOMIST: Brazil
But the river system that covers two-thirds of Australia's irrigated farming land is also suffering from decades of overuse.
ECONOMIST: To turn a drought into wine
Partly as a result, the land irrigated by canals has decreased by 35% since 1990.
ECONOMIST: Punjabis are poisoning themselves
On the whole, only 3.5% of Africa's arable land is irrigated and about 9% of world fertilizer is used in the continent, according to the U.N.
CNN: Agriculture must play 'critical role' in Africa's future
Weiss believes this climate change initiated a mass migration away from dry-land farming to the creation of irrigated fields along the Tigris and Euphrates rivers, allowing the people to build some of the earliest institutions of civilization.
CNN: Past may hold clues to climate's future
The floods devastated a tenth of Mozambique's land, and nine-tenths of its irrigated areas.
ECONOMIST: Lining up for a new life
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