At least a third of food grown around the world fails to be eaten, with the resulting food waste causing 10 per cent of global carbon emissions. However, there are pioneers trying to tackle different issues along the chain. We visit a project linking farmers direct to customers in Puerto Rico, check out smart labels that extend the shelf life of food by revealing when food actually goes off, and revisit an app where millions of people share spare food for free. Presenter: Myra Anubi Reporter/Producer: Jo Mathys Reporter/Producer: Claire Bates Producer in Puerto Rico: Adriana De Jesus Producer: Richard Kenny Series producer: Tom Colls Sound mix: Hal Haines Editor: Penny Murphy Image: Crystal Díaz