"For many years Isabella Tree and Charlie Burrell struggled to make a go as farmers, doing everything they could to make the heavy clay soils of their farm at Knepp in West Sussex as productive as possible, while rarely succeeding in making a profit. By 2000, facing bankruptcy, the couple decided they would try something new. They would restore their 3,500 acres, farmed for centuries, even millennia, to the form that they had had before human intervention....