For the sake of the world's poor, Charles Kenny argues yes:
The best way to help poor people eat well is to make healthy food cost less. But the more agricultural land we divert into lower-efficiency organic production, the higher the price of all food will climb. On test farms, organic production has been shown to be at least as efficient as conventional farming — and considerably more productive than the average efficiency seen on farms in the developing world. But until that's widely replicated outside agricultural research stations, organic is no friend to the world's poorest consumers.