Sir Tim Berners-Lee surprises observers by using the latest tech craze to raise funds for charity. Plus, we visit the Founders Forum ClimateTech Summit to hear entrepreneurs’ ideas for tackling the environmental emergency. And will wearable health devices one day be replaced by implanted sensors? Presented by Rory Cellan-Jones, with senior BBC tech reporter Zoe Kleinman. Produced by Jat Gill.

(Image: Sir Tim Berners-Lee with NFT graphics, Credit: Getty Images).