Defenders respond that permaculture is not yet a mainstream scientific tradition and lacks the resources of mainstream industrial agriculture. Rafter Ferguson and Sarah Lovell point out that permaculturalists rarely engage with mainstream research in agroecology, agroforestry, or ecological engineering, and claim that mainstream science has an elitist or pro-corporate bias.Ferguson and Lovell 2013 Julius Krebs and Sonja Bach argue in Sustainability that there is "scientific evidence for all twelve [of Holmgren's] principles".
Defenders respond that permaculture is not yet a mainstream scientific tradition and lacks the resources of mainstream industrial agriculture Rafter Ferguson and Sarah Lovell point out that permaculturalists rarely engage with mainstream research in agroecology agroforestry or ecological engineering and claim that mainstream science has an elitist or pro-corporate biasFerguson and Lovell 2013 Julius Krebs and Sonja Bach argue in Sustainability that there is "scientific evidence for all twelve [of Holmgren's] principles"