Charles Kenny
argues that abandoning organic food would be good for the world's poor. A little detail on the subject:
Whether organic is as efficient as conventional farming -- in terms of land yield, energy, or labor productivity -- depends on the place and the crop. But even organic sympathizers report that the average land yield in the industrial world is about 8 percent lower on organic farms than on conventional ones. And it only takes a trip to the local supermarket to understand there's a considerable price premium to be paid. Organic milk costs as much as twice the regular kind, for example. The practices of industrial-scale U.S. producers like Stonyfield Farm, which dries organic milk from those energy-efficient New Zealand producers into powder in order to ship it to its plant in Londonderry, New Hampshire, where it's turned into yogurt, keep organic dairy prices climbing even higher.
Earlier post on the issue
here.