A solar farm, set and run by women in the Abs district of Yemen is providing cleaner and cheaper electricity to families. Arvind Kumar is Project Manager in the Yemen Country Office of the United Nations Development Programme. He is overseeing the programme and joins us on the show.Tackling climate change with data A global initiative to satellite observations, sensors across land and sea, commercial data sets and even citizen observations from our mobile phones is gathering momentum. Now the UNEP is highlighting environmental data as essential combatting climate change. David Jensen, Head of Policy and Innovation, Crisis Management Branch, UN Environment explains their plans.Smelltech In the world of virtual reality, companies normally focus on images and sound to create the most immersive experience. But there is a new kid on the block: olfactory VR. Companies now seek to capture one of our more neglected senses and recreate smell in a virtual environment. Digital Planet reporter Florian Bohr has been finding out more.The programme is presenter by Gareth Mitchell with expert commentary from Bill Thompson.(Image: Getty Images) Studio Manager: Matilda Macari Producer: Ania Lichtarowicz