There are plenty out there! 'The Secret Life of Plants' offers many points from this perspective...
I would have taken the time to implement such perspectives but, I just didn't care too ;) Maybe I will do this article again in the future and go a bit deeper :)
As for me, my proof is in the plants and the gifts they provide! I'm a full believer based on the outcomes of the system!
It's amazing how far our culture has come from alienating itself from the source of true health and happiness!