Are Western brands doing enough to keep forced labour out of their supply chains? Ed Butler speaks to researcher Darren Byler at the University of Colorado, who says tracing products from slave labour institutions in China's Xinjiang province to the west is not easy. Alan McClay from the Better Cotton Initiative explains what they do to monitor slave labour. Kate Larsen, a private consultant specialising in supply chain problems, says Western firms are only slowly understanding the scale of the problems they face, and what they have to do to tackle them.

(Photo: The Chinese flag behind razor wire at a housing compound in China's western Xinjiang region, Credit: Getty Images)

We hear from the western Chinese province of Xinjiang, where perhaps 1.5 million Uighur Muslims are believed to be held in what Chinese authorities call 're-education' camps, and where we hear testimony of forced labour in factories. Vice News journalist Isobel Yeung tell us what she saw on a recent visit to the province. Darren Byler, a social anthropologist affiliated with the University of Colorado at Boulder, tell us about the extent of the forced labour operation there.

(Photo: A watchtower on a high-security facility near what is believed to be a re-education camp where mostly Muslim ethnic minorities are detained, on the outskirts of Hotan, in China's northwestern Xinjiang region, Credit: Getty Images)

Isabel dos Santos faces charges in her native Angola. The daughter of the former long-time president is accused of corruption after a leak of documents. Ed Cropley, former Reuters sub-Saharan Africa bureau chief, discusses what could happen next. Mark Hays from the campaign group Global Witness explains why the role of international banks and accountants in the scandal shouldn't be a surprise. Tom Keatinge from the Royal United Services Institute, a think tank, argues that countries like the UK have made some progress in tackling money laundering.

(Photo: Isabel dos Santos in 2018, Credit: Getty Images)

Why don't more manufacturers embrace the principles of the circular economy? It's a pertinent question, given the dire state of the recycling industry.

Manuela Saragosa speaks to one company that has already implemented the principles of the circular economy. Cardboard box manufacturer DS Smith tracks its products throughout their life, and can reuse the fibres they contain up to 25 times, according to the firm's sustainability lead, Sam Jones.

So why don't more manufacturers do the same? Manuela speaks to circular economy expert Alexandre Lemille, Jarkko Havas of the Ellen MacArthur Foundation, and Josephine von Mitschke-Collande of EIT Climate-KIC in Switzerland.

(Picture: Old plastic water bottle on a beach; Credit: s-c-s/Getty Images)

Katie Prescott revisits the efforts of the Zanzibar government to chart its territory by flying drones across the African spice island.

A year ago she met planning minister Mohammed Juma, the brains behind this ambitious project that aims to clarify land property rights, provide information to local residents about the location of services and amenities, and help the government plan everything from flood management to urban redevelopment.

Katie catches up with Edward Anderson of the World Bank, who headed up the drone mapping project, to find out how the data they have gathered is now being crunched by artificial intelligence algorithms, and being made available to the public.

Producer: Sarah Treanor

(Picture: Aerial view of Zanzibar beach; Credit: den-belitsky/Getty Images)

How strikes and protests affect the economies of major cities. Will Bain visits Paris to see how strikes on the transport network are affecting local businesses, while Ed Butler speaks to author and former Hong Kong civil servant Rachel Cartland about the economic impact of anti-China protests in the region.

(Photo: Protests against the policies of French president Emmanuel Macron in Paris in January, Credit: Getty Images)

The monitoring of employees in the workplace is becoming commonplace. Ed Butler speaks to Sean Petterson, boss of StrongArm Technologies, a company that monitors construction and warehouse workers to reduce workplace accidents. Griff Ferris from the anti-surveillance campaign group Big Brother Watch explains why workplace monitoring could be imposed without employees' consent. Brian Kropp from the advisory firm Gartner questions the value of all the data being generated by monitoring technology.

(Photo credit: Getty Images)

Modern tech is accused of interfering with our sleep, keeping us up late anxiously staring at our phone screens. But could a phone app provide the cure?

Roughly one in three people in most developed countries typically tell surveys that the suffer from insomnia. The BBC's Laurence Knight is one of them. He seeks the advice of sleep physician Dr Guy Leschziner of Guy's Hospital in London, who explains how sleep and anxiety can become a vicious circle.

The good news is that there is a new non-drug treatment that is proving remarkably successful - cognitive behavioural therapy for insomnia. The bad news is that there are nowhere near enough trained clinicians able to provide treatment. That provides a gap in the market - and one that Yuri Maricich of US medical tech firm Pear Therapeutics hopes to fill with a mobile phone app of all things.

(Picture: Cell phone addict man awake at night in bed using smartphone; Credit: OcusFocus/Getty Images)

How the rise of 'microwork' is helping develop artificial intelligence. Ed Butler speaks to New York Times reporter Andy Newman about his experience on Mechanical Turk - the Amazon-owned platform that offers tiny jobs for tiny wages. Microworker Michelle Munoz explains how she makes a good living from online microwork in Venezuela. Ronald Schmelzer, analyst at Cognilytica, an AI market research firm, explains why data-labelling tasks common on microworking sites play a central role in developing artificial intelligence. And researcher and author Mary Gray warns about the impact of microwork on workers' rights.

Producer: Edwin Lane

(Photo credit: Getty Images)

Soil degradation is reducing crop yields and adding to climate change. It's a big headache not just for farmers, but for all of us.

But fear not, as Ed Butler heads to a wheat field in eastern England where farmer Simon Cowell thinks he has a simple, counter-intuitive solution to the problem: Cut back on fertilisers and pesticides, and plough less. He claims it restored his land in two years.

But if it's this simple, why isn't everyone doing it? And what happens if we don't do anything? How quickly will we run out of usable soil, and how much carbon will our soils emit into the atmosphere?

The programme also features interviews with Ronald Vargas of the UN Food and Agriculture Organization; professor of soil conservation Jane Rickson of Cranfield University; and geologist David Montgomery of the University of Washington.

Producer: Josh Thorpe

(Picture: Close-up young plant growing in the soil; Credit: Mintr/Getty Images)

Why our growing use of technology is a threat to the planet. Ed Butler speaks to Ian Bitterlin, a visiting professor at the University of Leeds in the UK and an expert in the data centres that underpin the internet and use vast amounts of energy. Ruiqi Ye, a climate and energy campaigner for Greenpeace in Beijing, explains why data centres are adding to the climate change problem. Halvor Bjerke from Norway's DigiPlex, the Nordic region’s leading data centre supplier, tells us why putting more data centres in colder parts of the world could be part of the solution.

Producer: Josh Thorpe

(Photo: Servers in a data centre in the UK, Credit: Getty Images)

How easy is it to predict where tech will take us in the next decade, and have we hit a plateau in the pace of innovation?

Manuela Saragosa speaks to author and artist Douglas Coupland, who retells how a mind-bending run-in with a Google research team left him convinced that the next huge development hurtling towards us like a meteor is what he calls "talking with yourself".

Science fiction predictions of the future are notoriously wayward - where are the hoverboards and ubiquitous fax machines promised by the Back to the Future films? Nonetheless, forecasting tech developments can be 85% accurate over a 10-year time horizon, according to professional futurologist Dr I D Pearson.

But while tech may continue to take us to new and strange places in the long term, has Silicon Valley run out of earth-shattering new products, at least in the short term? The BBC's Zoe Kleinman reports from a rather subdued CES 2020 tech conference in Las Vegas.

Producer: Laurence Knight

(Picture: Cracked egg containing computer circuitry; Credit: sqback/Getty Images)