Keir Starmer has said Britain must seize opportunities for green jobs or risk repeating the mistakes made when coal mines shut down.
The Labour leader said future generations "will never forgive us" for failing to plan for the future as he sought to smooth tensions with the GMB union, which has criticised his plans to block new North Sea oil and gas developments.
After an address to the union's conference in Brighton, Mr Starmer was challenged by a GMB Scotland rep called Tam, who warned banning new North Sea oil and gas drilling would leave communities "decimated".