I do a lot of volunteering work with the Woodland Trust in the UK, negotiating with people who want to donate their land to restoration purposes. Britain is a land of fields and hedgerows (distributed). Many people fail to understand that most "wilderness" that we want to bring back is reliant on density (or concentration). I know many land owners who want to rewild parts of theirs, but are expecting temperate rainforest on a plot of land a couple acres across. It doesn't work like that.

The only way to bring back these lost or dying ecosystems is across large stretches of land, hundreds if not thousands of acres across. We have tiny pockets left in Cornwall, Wales and Scotland, but for the most part the country is ecologically baren in comparison to that a couple of thousand years ago.

Vast and continuous National Parks are one of the few viable ways to maintain or bring back our species rich ecosystems. Distributed "wilderness" between city blocks or cattle grazing land is duct tape on a leaky bucket.