The Arctic treeline is the frontline of climate change, where the trees have been creeping towards the pole for fifty years already.

Scientists are only just beginning to understand the astonishing significance of these northern forests for all life on Earth. At the treeline, Rawlence witnesses the accelerating impact of climate change and the devastating legacies of colonialism and capitalism. But he also finds reasons for hope. Humans are creatures of the forest; we have always evolved with trees and The Treeline asks us where our co-evolution might take us next.