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Paying extra to offset your carbon emissions may sound like a good idea. But does planting trees or paying to save a rainforest actually reduce your carbon footprint? Travel writer Manchán Magan and climate scientist Thales West explain why they're sceptical. We also hear from one of America's leading airlines, United, which is increasing the number of flights powered by waste products and old cooking fat. United's head of global environmental affairs Lauren Riley tells us more.Photo: A plane casts a shadow over a forest (Credit: Getty)

On this edition of Business Weekly, we look at the battle between the makers of one of the world’s biggest computer games, Fortnite, and the world’s biggest tech company, Apple. The court case could have implications for how app stores and payment models are run in the future. We also take a look at the jewellery sector and hear two different tales of sustainability - from those selling diamonds made in a laboratory and those digging them out of the ground. Plus, we head to campuses in the United States, where universities cash in on the popularity of college sports, while the players themselves - the students – rarely see a penny for their efforts. That is quickly changing, but perhaps too rapidly for some observers. Business Weekly is presented by Sasha Twining and produced by Matthew Davies.

Scientists, artists and some of the world’s biggest companies are carving up the visual spectrum, and claiming certain colours as their own, so who does have a right to use the colours of the rainbow? We explore the ongoing rift over the worlds “blackest black” Vantablack, which was created by engineering firm Surrey Nanosystems, and can only be used by the artist Anish Kapoor. Contemporary British artist Stuart Semple argues that creativity should not be limited by commercial agreements, while Surrey Nanosystems executive Ben Jensen explains that the material is not suitable for general use. Author Kassia St Clair explores the meaning and history of colour, and we hear how interpretations of colour have changed from Julie Irish, an assistant professor specialising in colour, at the College of Design in Iowa.Note: Surrey NanoSystems has clarified their material Vantablack isn’t toxic, as described by one speaker in this programme, but can be an irritant.This programme is a repeat from January 2021.(Picture of a colour splash via Getty Images).