Is organic efficient?

I have long argued that organic farming is not as efficient as factory farming. Over at From Poverty to Power, Duncan Green points to a couple of reports, including one from the FAO, have found that switching to organic farming would decrease production in the developed world and improve production in the developing world, where farming techniques are often way behind the curve.

Organic production can reduce greenhouse gas production, but at a potentially serious cost to food security. I agree with Green that this does have a silver lining: if we start putting more research into farming practices and improving soil use, the benefits could be great. But lets not start moving "off the grid" as it will help no one.