June 19, 2008 6:00 PM

Africa needs a farming revolution, experts say

With the world's appetite for food expanding, sub-Saharan Africa, where nearly two-thirds of people making their living from farming, could be developing into an agricultural powerhouse. But Africa's farms today are only one-fourth as productive as the world average. Populations are growing fast, while food productivity per capita has declined from 30 years ago. During that time, Africa has gone from a continent of food exporters to one that imports some 20 million tons of it every year.

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