"Scientists spent a decade intensively monitoring the impacts of a large government-funded experiment at Hillesden, a 1,000-hectare commercial arable farm in Buckinghamshire. (...) Numbers of some butterfly species including the gatekeeper and green-veined white doubled, and birds that usually feed on insects benefited from the shelter provided by hedges and grass margins, including the great tit, up 88%, and blue tit, up 73%. They also found that overall yields at Hillesden were maintained – and enhanced for some crops – despite the loss of agricultural land for habitat creation."
The science is in: permaculture works, it can feed us all and it helps the planet too.