Colonising silver birch in glaciated valley, Alladale.

Introduction

       David Woodfall

      Following the end of the last Ice Age 10,000 years ago, Britain and Ireland began to colonise with birch and oak which, apart from mountain tops, became established in all of our islands. Rewilding, essentially a new concept, is the return to allowing nature to take its own course and carpet our islands once more in natural vegetation and its associated fauna. During the Mesolithic period (15,000–5,000 bce) this native forest was considerably modified by burning and felling. By the Middle Ages (500 ce onwards) the wildwood had been replaced by a mosaic of cultural landscapes, created by an ever-increasing population. The Enclosure Acts of the eighteenth century were swiftly followed by the Industrial Revolution, with its increasing demands on mineral and timber resources, and further modified our landscapes. Landscapes became empty of all of our major predators, such as wolves, and landscape modifiers such as the beaver. While our cultural landscapes contained wonderful chalk grassland grazed by huge flocks of sheep, numerous heathlands grazed by cattle and diminishing peat bogs harvested by crofters in the north and west, these landscapes were unrecognisable from their native state, much of their diversity and richness gradually stripped away. During the Industrial Revolution there was a rapid reduction in the number of people employed on the land and a consequent decline of rural communities. There were changes, too, affecting limestone pavements, peatbogs – a reduction of sheep farming led to the depletion of chalk grassland. The last time our islands possessed any degree of biological richness was the 1930s, a richness that disappeared swiftly during the 1940s when World War II interrupted food imports, leading to a massive increase in lands given over to arable crops.

      By the 1960s only a handful of intensively managed nature reserves contained a fraction of our previous flora and fauna, often isolated islands in an extensive agricultural prairie, where food production was continually supported by pesticides and chemical fertilisers, further diminishing our wildlife – the future of peregrine falcons were threatened by the build-up of toxins in the food chain. In the US, scientists such as Rachel Carson began to draw the public’s attention to such concerns and the environmental movement was born. This has subsequently led to the evolution of the rewilding movement, which I would define as allowing the natural succession from open ground to forest to take place, much in the way it happened 10,000 years