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As the world looks for ways to boost food production by at least 70 percent by 2050 to feed an increasingly hungry planet, many people are looking to sub-Saharan Africa -- a region with 50 to 60 percent of the planet's unused arable land.

Whatever their motivation, key players are talking up Africa's Green Revolution ahead of global meetings this year, from the G8 and G20 to Rio+20, where food security initiatives will take centre stage.