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The market where carbon offsets are bought and sold has been projected to grow and grow, as big companies look to prove they can reach net zero. But where achieving reductions in emissions is impossible or expensive, an alternative is to try and arrange for carbon to be taken out of the atmosphere instead. The markets have thrived on linking buyers of carbon offsets - big firms, and even governments - to development projects in poorer countries, where land and labour for tree planting are cheap.But can these projects be safely verified and measured? Are local communities being exploited to try and make the maths add up? And can the industry afford to admit when a project is underperforming the expectations according to which carbon credits have been sold?Investigative reporter Max de Haldevang hears from experts and individuals directly involved in high profile carbon offset projects to find out.CORRECTION: A contributor to this programme states that sales of Plan Vivo credits generated about $100m in 2023-24. In fact, the correct figure is $8.7m. It is also stated by a contributor that “Plan Vivo is relatively niche in terms of registries. They have a market share of about 1%”. To clarify, while Plan Vivo’s market share is about 1%, it is incorrect to refer to the company as a registry; Plan Vivo uses a third party registry to issue Plan Vivo Certificates.Producer: Robert NicholsonA Whistledown production for BBC Radio 4

Nicola Packer went to Chelsea and Westminster Hospital for help after she delivered a 26-week-old foetus in her bathroom. But she was reported to the police - and arrested as she lay in bed recovering from major surgery. She was then escorted to a waiting police van and forced to spend the night in a police cell. File on 4 Investigates hears her story and reveals how, behind the scenes of the investigation, police had serious concerns over her controversial arrest. She believed she was only six weeks pregnant when she took abortion medication during lockdown - but she was prosecuted anyway. Her ordeal lasted nearly half a decade and, she says, it has had life-changing consequences for her. The case has also led to renewed calls from MP's and health professionals for a change in the law. Reporter: Kate West Producer: Anna Meisel Assistant producers: Jim Booth and Ben Robinson Techincal producer: Richard Hannaford :Production coordinator: Tim Fernley Editor: Carl Johnston

The story of Gisele Pelicot shocked the world. For almost a decade, the 72-year-old French grandmother’s husband Dominique secretly sedated her with sleeping pills and anxiety medication and raped her. He invited fifty other men to rape her too - documenting the abuse in thousands of photographs and videos. Dominique Pelicot has been jailed for 20 years. But Gisele is not alone. One British woman, Kate (not her real name) has told File on 4 Investigates how she confronted the unthinkable – that the man she thought loved her, had been secretly drugging and sexually assaulting her for years. He laced her bedtime cup of tea with medication so he could commit his crimes in secret. Kate talks to reporter Jane Deith about what it’s like to discover you’re married to a monster. Kate’s children describe the devastating impact on learning their father was a rapist. File on 4 investigates hears from the police detective who built the case against Kate’s now ex-husband, and how he almost avoided being brought to justice after the Crown Prosecution Service initially said there wasn’t enough evidence to put him on trial. It was left to Kate to fight the system to get justice – and keep herself safe.File on 4 Investgates discovers domestic spiking is disturbingly common in cases of domestic abuse. One academic has coined the term ‘chemical control ’ to describe the administration of medication to physically subdue women. Unlike physical violence, spiking may leave no trace and hence go unnoticed by victims, the police, doctors, and social workers.A new named offence of spiking is soon to be introduced. But with much of the focus still on spiking in settings like bars and clubs, will it address the threat behind closed doors?Reporter: Jane Deith Producer: Emma Forde Technical Producer: Nicky Edwards Production Coordinator: Tim Fernley Editor: Carl JohnstonIf you've been a victim of sexual abuse or violence, details of help and support are available at bbc.co.uk/actionline