In January, a joint investigation by the Guardian, Die Zeit and Source Material found that the forest carbon offsets approved by the world’s leading certifier and used by major corporations for climate claims are largely worthless.

Patrick Greenfield, one of the reporters on the investigation, will detail the story of their investigation and discuss its wider implications for conservation and corporate net-zero claims.

Patrick Greenfield is a reporter for the Guardian and the Observer. He writes about biodiversity loss and the climate crisis.