Intensive farming good for forests

This story in the New Scientist highlights how intensive farming and trees go hand in hand. Despite the scepticism in the comments, a large number of species, including trees is necessary for successful, sustainable, intensive farming.
In many parts of the world the traditional agriculture is very intensive, what we in the west would now call Permaculture. Forest gardens are a good example. In these situations there is a diverse number of species, all providing different foods, useful products and maintaining the system.
Our conventional monocultures, are different in that they produce alot of very few crops – but are actually less intensive, in that the total output is less.
We often fail to recognise very intensive agriculture, such as that practiced in pre-colombian Amazon, because of its sheer diversity.
New Scientist 25th August Intensive farming good for forests.