It seems as if Professor Tim Benton Study spikes organic food environment claims - Times Online made some claims about this project which aren't shared by the rest of the researchers working on the project with him. Dr Bruce Pearce is one of these and he has shown surprise at the comments made by Prof. Benton Organic farms do help biodiversity -Times Online. Thank you Bruce. It is unfortunate that the Times chose to carry the story without referring to the study itself, others involved in producing the study or any of the other research which does show the biodiversity benefits that organic farming systems deliver.
It is not just in terms of biodiversity that organic farming provides benefits but across a range of environmental factors. For more details look at Defra's own study.