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Could blockchain technology solve the global problem of food fraud? Rahul Tandon reports on a meat scandal in India and Manuela Saragosa speaks to Jessi Baker, the boss of Provenance, a company that uses the blockchain to make supply chains more transparent, and to Chris Elliott from the Institute for Global Food Security at Queen's University in Belfast in the UK.(Photo: Cow farming in the UK, Credit: Getty Images)

Coal fires used to beat the bitter cold of Mongolian winters blanket capital city Ulaanbaatar with smog in the winter, the BBC's Roger Hearing finds, when he meets residents from the Ger District.Typical sanitation is makeshift and in the form of latrines, says Choikhand Janchivlamdan, a sanitation expert at the Green Initiative. This can lead to the spread of disease. Lost livestock due to harsh winters and a desire for better education is leading people to the city, she says. As people move to the city from the countryside, the problem gets worse as no new sewage systems are built.Tserenbat Namsrai, Mongolia's environment minister, plans to introduce smokeless fuel in a bid to combat pollution and introducing more electric heating.Robert Ritz, a US professor who lives in the city, says PM2.5 particulates - that's atmospheric particulate matter that have a diameter of less than 2.5 micrometres - kill thousands of people per year.

Two companies dominate the global eyewear industry - and now they are merging into a glasses behemoth. What does it mean for the bespectacled public?Manuela Saragosa investigates the story behind these two anonymous giants - Italian fashion frames designer Luxottica, and French lens-maker Essilor - with the help of American eyewear retail pioneer E Dean Martin, and Gordon Ilett of the UK's Association of Optometrists. And she asks the European Commission why they were happy to wave through their merger earlier this year. Producer: Laurence Knight.Producer: Laurence Knight(Picture: Glasses model frames - black silhouettes isolated on white; Credit: Alxyzt/Getty Images)