George Monbiot: Surrounded by fear

Humans face a series of interlinked existential challenges. How do we feed a global population heading towards ten billion? Can it be done without degrading ecosystems and exacerbating climate change to a calamitous extent? Stephen Sackur interviews writer and environmental activist George Monbiot, who has spent decades addressing these questions and framing radical answers. Why are so many politicians and voters seemingly unwilling to listen?