Hi again Permies,
I have created a very thorough resource containing all of the best mainstream scientific evidence supporting the efficacy of Regenerative Agriculture. Many of the articles are supporting Permaculture practices, but do not specifically mention the word Permaculture. There are hundreds of peer reviewed articles. A bunch of them are specifically about Holistic Management, too.
Anyways, check it out. And the next time someone demands that you "provide references" simply direct them to this page! That should shut them up.
http://sheldonfrith.com/2015/12/02/evidence-for-regenerative-agriculture/
I have also organized some of the evidence to support these three statements:
"Regenerative Agriculture is more profitable." (this is more of a reference to Holistic Management, not Permaculture, haha.)
"Regenerative Agriculture is more productive."
"Regenerative Agriculture really does regenerate land."
So if you ever want to provide evidence to support those statements you can find it here.
Enjoy. Don't be timid as you spread the word about Permaculture... it works and we can prove it a thousand times in a hundred different ways!!!