Fakta:
de Ponti, T., Rijk, B. och van Ittersum, M.K. 2012. The crop yield gap between organic and conventional agriculture, Agricultural Systems 108: 1–9. http://dx.doi.org/10.1016/j.agsy.2011.12.004
Seufert, V. Ramankutty, N. och Foley, J.A. 2012. Comparing the yields of organic and conventional agriculture, Nature 485: 229-232. http://www.nature.com/nature/journal/vaop/ncurrent/full/nature11069.html