A study of agro-ecological farming practices by Jules Pretty in 2006 examined 286 sustainable agricultural projects in 57 countries and concluded that yields had increased an average of 79%.
Uno studio sulle pratiche agricole agro-ecologiche, di Jules Pretty, nel 2006, ha esaminato 286 progetti agricoli sostenibili in 57 paesi e ha concluso che i rendimenti sono aumentati in media del 79%.