I am not a big fan of Bjørn Lomborg and I think articles about him on Real Climate and DeSmogBlog are important to read but I find him pretty much on target with regard to organic food in this op-ed he has penned for The Telegraph.
Think organic food is better for you, animals, and the planet? Think again
Likewise, animals on organic farms are not generally healthier. A five year US study showed that organic “health outcomes are similar to conventional dairies”. The Norwegian Scientific Committee for Food Safety found “no difference in objective disease occurrence.” Organic pigs and poultry may enjoy better access to open areas, but this increases their load of parasites, pathogens and predators.