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Warning over ‘dirty secret’ of toxic chemicals on farmers fields
Environment correspondent
Getty ImagesSuccessive governments have failed to deal with the threat posed by spreading sewage sludge containing toxic chemicals on farmers’ fields, a former chair of the Environment Agency has told the BBC.
About 3.5 million tonnes of sludge – the solid waste produced from human sewage at treatment plants – is put on fields every year as cheap fertiliser.
But campaigners have long warned about a lack of regulation and that sludge could be contaminated with cancer-linked chemicals, microplastics, and other industrial pollutants.
Emma Howard Boyd, who led the EA from 2016 to 2022, says the agency had been aware since 2017 that the sludge can be contaminated with substances, including ‘forever chemicals’.
“Forever chemicals” or PFAS are a group of synthetic chemicals which come from things like non-stick saucepans. They don’t degrade quickly in nature and have been linked to cancer.
Documents seen by BBC News suggest the water industry is now increasingly concerned that farmers could stop accepting the sludge to spread and that water firms have been lobbying regulators and making contingency plans in case rules change.
Ms Howard Boyd says efforts to update rules, which date back to 1989, to include new contaminants were “continually frustrated by the lack of ministerial appetite to deal with this issue.” In a public letter signed by more than 20 others she called on the current Environment Minister Steve Reed, to act now.
The Department for Environment Food and Rural Affairs (Defra) told the BBC regulations around sludge spreading are being looked at. The water companies trade body Water UK told the BBC they were aware of the concerns but that no legal standards for contaminants had been set by the government.
BBC/Jonah FisherUnlike the cleaned water that is discharged from wastewater treatment plants, the sewage sludge, or biosolid as the industry calls it, is considered “exempted waste”.
That means the treatment focuses mainly on killing bacteria and testing for heavy metals in the sludge.
There is no routine testing for chemicals, including “forever chemicals”, which have been developed over the last three decades and are getting into the sewage network from both from domestic and industrial users.
“I think the big concern is because these substances (forever chemicals) are so persistent they’ll stay around in the soil for hundreds, if not thousands of years,” says Alistair Boxall, professor of environmental science at York University.
“It may be in 10 years’ time that we start understanding that these molecules are causing harm,” he said. “Then we’re going to be in a bit of a mess, because we’ll be in a situation where we’ll have soils in the UK that will have residues of these molecules in them, and at the moment we have no way of cleaning that up.”
In 2022, the US state of Maine became the first state to ban the spreading of sludge contaminated with “forever chemicals” after high levels were found in water, soil and crops.
Reports and emails shown to the BBC by Greenpeace’s Unearthed investigation unit and obtained using Freedom of Information Act requests, reveal the water industry is acutely aware that attitudes are changing and is both lobbying government and making contingency plans.
The companies are concerned on two fronts: that general rules regarding the spreading of sludge on land (so called Farming Rules for Water) may soon be tightened due to fears that it’s polluting watercourses and that farmers’ concerns about the chemicals in the sludge might make them unwilling to put it on their fields.
The water industry has already commissioned reports looking at what might happen if the spreading is restricted.
One of them predicts that the “most likely” scenario is a shortfall of about three million hectares in land needed to spread the sludge. The water industry says that would lead to them either incinerating it or putting it into landfill. Both options would bring extra costs that would be passed on to billpayers.
“This investigation is yet more proof that we can’t trust the privatised water companies to deal with waste responsibly,” Reshima Sharma from Greenpeace said.
“So long as they can get away with it, they will just pass any problems on to our countryside and pocket the money they should be investing in solutions.”
Getty ImagesIn 2017 a report commissioned by the Environment Agency found that sludge contained potentially harmful substances, including microplastics and “forever chemicals”, at levels that “may present a risk to human health” and may create soil that is “unsuitable for agriculture”.
It said that “perhaps the biggest risk to the landbank” is from the spreading of physical contaminants such as microplastics into agricultural soil. The report also said it had heard evidence from EA staff indicating that some companies may be using wastewater treatment plants to “mask disposal of individual high risk waste streams not suitable for land spreading”.
“EA colleagues were continually frustrated by the lack of ministerial appetite to deal with this issue,” Ms Howard Boyd, who was chair of the regulator at the time, told the BBC in an email.
“EA proposals since 2020 to reform the regulations were treated with a lack of urgency, hampered by delays in passing requests up to the relevant ministers for decision-making, and a consistent failure by successive secretaries of state to take the matter seriously.”
The letter Ms Howard Boyd has signed jointly signed was organised by campaign group Fighting Dirty. It calls the contents of the sewage sludge a “dirty secret” and demands that Environment Secretary Steve Reed take action.
BBC/Jonah FisherSewage sludge is cheaper than other fertilisers, and can sometimes be free, though farmers may have to spread it themselves.
Julie Lewis-Thompson tells me it has “the smell of death”.
“It lingers in the air for somewhere around two to three weeks,” she tells me when I go to visit in her home on Dartmoor in the south-west of England.
She’s gathered together a group of neighbours who’ve all had direct experience of sewage sludge being spread near their properties. Before we start recording there’s a long discussion about whether they should speak out for fear of upsetting nearby farmers and the contractors who spread the sludge, who are often local.
Many of their concerns are about the smell and about potential contamination of their water sources. One young woman leaves in tears saying it had made her sick.
“The fact it’s spread for free ought to raise a few eyebrows,” Richard Smallwood, a local beef and sheep farmer who doesn’t use sewage sludge, tells me.
“If we’re starting to produce food on grassland and arable land which is filled up to the ear holes with PFAS compounds and nano and micro-plastics that find their way into the food chain I think my job’s over before I begin.”
BBC/Kevin ChurchWith the alternatives to sewage sludge disposal costly, there’s broad agreement that the recycling of sludge into fertiliser has to be made to work.
“In principle, I think using properly treated human sewage to spread on the land, put it back into the ground for growing food in the UK, that’s the right thing to do,” Hugh Fearnley-Whittingstall, the cook, writer and broadcaster, tells me at his small farm and café in east Devon. He’s also signed the protest letter to the environment minister.
“We know it’s happening. Our farmers are rightly worried. We’ve got to take action. Government’s got to take action,” Mr Fearnley-Whittingstall says.
“That means regulations are not voluntary regulations or guidelines, [they should be] legally enforceable regulations that stop these pollutants getting into the sewage and onto our land.”
Despite the concerns there are still plenty of farmers who see the sludge as a cheap way to fertilise their fields.
Will Oliver is on the National Farmers Union Crops Board. He says he applies about 800 tonnes of sewage sludge every year to fields where he grows maize destined for animal feed.
The water company provides the sludge for free and Mr Oliver says he’s careful how much he uses and trusts the company to make sure it doesn’t have chemical contamination.
“If we can be sensible with how it’s used and spread on the land, it can be positive for farmers and for the water companies,” he says.
“I’m doing it because it’s adding value. It’s improving our organic matter. It’s benefitting the crop that I’m growing, and it’s reducing my spend on bagged fertilisers.”
The Department for the Environment, Food and Rural Affairs did not contest anything the former chair of the EA Ms Howard Boyd told the BBC.
“We need to see the safe and sustainable use of sludge in agriculture to help clean up our waterways,” a spokesperson said.
“The Independent Water Commission will explore a range of issues, including the regulatory framework for sludge spreading, and we continue to work closely with the Environment Agency, water companies and farmers in this area.”
Water UK represents the water companies of England and Wales, and a spokesperson said: “Although there are some concerns that some bioresources may contain contaminants, such as microplastics and forever chemicals (PFAS), there are no legal standards for them and, in some cases, no agreed assessment techniques.”
“Any standards and techniques are a matter for the government and the regulator and need to be based on firm evidence and detailed scientific research.”
Technology Reporter
AstrolightI’m led through a series of concrete corridors at Vilnius University, Lithuania; the murals give a Soviet-era vibe, and it seems an unlikely location for a high-tech lab working on a laser communication system.
But that’s where you’ll find the headquarters of Astrolight, a six-year-old Lithuanian space-tech start-up that has just raised €2.8m ($2.3m; £2.4m) to build what it calls an “optical data highway”.
You could think of the tech as invisible internet cables, designed to link up satellites with Earth.
With 70,000 satellites expected to launch in the next five years, it’s a market with a lot of potential.
The company hopes to be part of a shift from traditional radio frequency-based communication, to faster, more secure and higher-bandwidth laser technology.
Astrolight’s space laser technology could have defence applications as well, which is timely given Russia’s current aggressive attitude towards its neighbours.
Astrolight is already part of Nato’s Diana project (Defence Innovation Accelerator for the North Atlantic), an incubator, set up in 2023 to apply civilian technology to defence challenges.
In Astrolight’s case, Nato is keen to leverage its fast, hack-proof laser communications to transmit crucial intelligence in defence operations – something the Lithuanian Navy is already doing.
It approached Astrolight three years ago looking for a laser that would allow ships to communicate during radio silence.
“So we said, ‘all right – we know how to do it for space. It looks like we can do it also for terrestrial applications’,” recalls Astrolight co-founder and CEO Laurynas Maciulis, who’s based in Lithuania’s capital, Vilnius.
For the military his company’s tech is attractive, as the laser system is difficult to intercept or jam.
It’s also about “low detectability”, Mr Maciulis adds:
“If you turn on your radio transmitter in Ukraine, you’re immediately becoming a target, because it’s easy to track. So with this technology, because the information travels in a very narrow laser beam, it’s very difficult to detect.”
AstrolightWorth about £2.5bn, Lithuania’s defence budget is small when you compare it to larger countries like the UK, which spends around £54bn a year.
But if you look at defence spending as a percentage of GDP, then Lithuania is spending more than many bigger countries.
Around 3% of its GDP is spent on defence, and that’s set to rise to 5.5%. By comparison, UK defence spending is worth 2.5% of GDP.
Recognised for its strength in niche technologies like Astrolight’s lasers, 30% of Lithuania’s space projects have received EU funding, compared with the EU national average of 17%.
“Space technology is rapidly becoming an increasingly integrated element of Lithuania’s broader defence and resilience strategy,” says Invest Lithuania’s Šarūnas Genys, who is the body’s head of manufacturing sector, and defence sector expert.
Space tech can often have civilian and military uses.
Mr Genys gives the example of Lithuanian life sciences firm Delta Biosciences, which is preparing a mission to the International Space Station to test radiation-resistant medical compounds.
“While developed for spaceflight, these innovations could also support special operations forces operating in high-radiation environments,” he says.
He adds that Vilnius-based Kongsberg NanoAvionics has secured a major contract to manufacture hundreds of satellites.
“While primarily commercial, such infrastructure has inherent dual-use potential supporting encrypted communications and real-time intelligence, surveillance, and reconnaissance across NATO’s eastern flank,” says Mr Genys.
BlackSwan SpaceGoing hand in hand with Astrolight’s laser technology is the autonomous satellite navigation system fellow Lithuanian space-tech start-up Blackswan Space has developed.
Blackswan Space’s “vision based navigation system” allows satellites to be programmed and repositioned independently of a human based at a ground control centre who, its founders say, won’t be able to keep up with the sheer volume of satellites launching in the coming years.
In a defence environment, the same technology can be used to remotely destroy an enemy satellite, as well as to train soldiers by creating battle simulations.
But the sales pitch to the Lithuanian military hasn’t necessarily been straightforward, acknowledges Tomas Malinauskas, Blackswan Space’s chief commercial officer.
He’s also concerned that government funding for the sector isn’t matching the level of innovation coming out of it.
He points out that instead of spending $300m on a US-made drone, the government could invest in a constellation of small satellites.
“Build your own capability for communication and intelligence gathering of enemy countries, rather than a drone that is going to be shot down in the first two hours of a conflict,” argues Mr Malinauskas, also based in Vilnius.
“It would be a big boost for our small space community, but as well, it would be a long-term, sustainable value-add for the future of the Lithuanian military.”
Space Hub LTEglė Elena Šataitė is the head of Space Hub LT, a Vilnius-based agency supporting space companies as part of Lithuania’s government-funded Innovation Agency.
“Our government is, of course, aware of the reality of where we live, and that we have to invest more in security and defence – and we have to admit that space technologies are the ones that are enabling defence technologies,” says Ms Šataitė.
The country’s Minister for Economy and Innovation, Lukas Savickas, says he understands Mr Malinauskas’ concern and is looking at government spending on developing space tech.
“Space technology is one of the highest added-value creating sectors, as it is known for its horizontality; many space-based solutions go in line with biotech, AI, new materials, optics, ICT and other fields of innovation,” says Mr Savickas.
Whatever happens with government funding, the Lithuanian appetite for innovation remains strong.
“We always have to prove to others that we belong on the global stage,” says Dominykas Milasius, co-founder of Delta Biosciences.
“And everything we do is also geopolitical… we have to build up critical value offerings, sciences and other critical technologies, to make our allies understand that it’s probably good to protect Lithuania.”
Artificial intelligence is the skill set that employers increasingly want from future hires. Find out how b-schools are equipping students to use AI
Business students are already seeing AI’s value. More than three-quarters of business schools have already integrated AI into their curricula—from essay writing to personal tutoring, career guidance to soft-skill development.
BusinessBecause hears from current business students about how AI is reshaping the business school learning experience.
The benefits and drawbacks of using AI for essay writing
Many business school students are gaining firsthand experience of using AI to assist their academic work. At Rotterdam School of Management, Erasmus University in the Netherlands, students are required to use AI tools when submitting essays, alongside a log of their interactions.
“I was quite surprised when we were explicitly instructed to use AI for an assignment,” said Lara Harfner, who is studying International Business Administration (IBA) at RSM. “I liked the idea. But at the same time, I wondered what we would be graded on, since it was technically the AI generating the essay.”
Lara decided to approach this task as if she were writing the essay herself. She began by prompting the AI to brainstorm around the topic, research areas using academic studies and build an outline, before asking it to write a full draft.
However, during this process Lara encountered several problems. The AI-generated sources were either non-existent or inappropriate, and the tool had to be explicitly instructed on which concepts to focus on. It tended to be too broad, touching on many ideas without thoroughly analyzing any of them.
“In the end, I felt noticeably less connected to the content,” Lara says. “It didn’t feel like I was the actual author, which made me feel less responsible for the essay, even though it was still my name on the assignment.”
Despite the result sounding more polished, Lara thought she could have produced a better essay on her own with minimal AI support. What’s more, the grades she received on the AI-related assignments were below her usual average. “To me, that shows that AI is a great support tool, but it can’t produce high-quality academic work on its own.”
AI-concerned employers who took part in the Corporate Recruiters Survey echo this finding, stating that they would rather GME graduates use AI as a strategic partner in learning and strategy, than as a source for more and faster content.
How business students use AI as a personal tutor
Daniel Carvalho, a Global Online MBA student, also frequently uses AI in his academic assignments, something encouraged by his professors at Porto Business School (PBS).
However, Daniel treats AI as a personal tutor, asking it to explain complex topics in simple terms and deepen the explanation. On top of this, he uses it for brainstorming ideas, summarizing case studies, drafting presentations and exploring different points of view.
“My MBA experience has shown me how AI, when used thoughtfully, can significantly boost productivity and effectiveness,” he says.
Perhaps one of the most interesting ways Daniel uses AI is by turning course material into a personal podcast. “I convert text-based materials into audio using text-to-speech tools, and create podcast-style recaps to review content in a more conversational and engaging way. This allows me to listen to the materials on the go—in the car or at the gym.”
While studying his financial management course, Daniel even built a custom GPT using course materials. Much like a personal tutor, it would ask him questions about the material, validate his understanding, and explain any questions he got wrong. “This helped reinforce my knowledge so effectively that I was able to correctly answer all multiple-choice questions in the final exam,” he explains.
Similarly, at Villanova School of Business in the US, Master of Science in Business Analytics and AI (MSBAi) students are building personalized AI bots with distinct personalities. Students embed reference materials into the bot which then shape how the bot responds to questions.
“The focus of the program is to apply these analytics and AI skills to improve business results and career outcomes,” says Nathan Coates, MSBAi faculty director at the school. “Employers are increasingly looking for knowledge and skills for leveraging GenAI within business processes. Students in our program learn how AI systems work, what their limitations are, and what they can do better than existing solutions.”
The common limitations of using AI for academic work
Kristiina Esop, who is studying a doctorate in Business Administration and Management at Estonian Business School, agrees that AI in education must always be used critically and with intention. She warns students should always be aware of AI’s limitations.
Kristiina currently uses AI tools to explore different scenarios, synthesize large volumes of information, and detect emerging debates—all of which are essential for her work both academically and professionally.
However, she cautions that AI tools are not 100% accurate. Kristiina once asked ChatGPT to map actors in circular economy governance, and it returned a neat, simplified diagram that ignored important aspects. “That felt like a red flag,” she says. “It reminded me that complexity can’t always be flattened into clean logic. If something feels too easy, too certain—that’s when it is probably time to ask better questions.”
To avoid this problem, Kristiina combines the tools with critical thinking and contextual reading, and connects the findings back to the core questions in her research. “I assess the relevance and depth of the sources carefully,” she says. “AI can widen the lens, but I still need to focus it myself.”
She believes such critical thinking when using AI is essential. “Knowing when to question AI-generated outputs, when to dig deeper, and when to disregard a suggestion entirely is what builds intellectual maturity and decision-making capacity,” she says.
This is also what Wharton management professor Ethan Mollick, author of Co Intelligence: Living and Working with AI and co-director of the Generative AI Lab believes. He says the best way to work with [generative AI] is to treat it like a person. “So you’re in this interesting trap,” he says. “Treat it like a person and you’re 90% of the way there. At the same time, you have to remember you are dealing with a software process.”
Hult International Business School, too, expects its students to use AI in a balanced way, encouraging them to think critically about when and how to use it. For example, Rafael Martínez Quiles, a Master’s in Business Analytics student at Hult, uses AI as a second set of eyes to review his thinking.
“I develop my logic from scratch, then use AI to catch potential issues or suggest improvements,” he explains. “This controlled, feedback-oriented approach strengthens both the final product and my own learning.”
At Hult, students engage with AI to solve complex, real-world challenges as part of the curriculum. “Practical business projects at Hult showed me that AI is only powerful when used with real understanding,” says Rafael. “It doesn’t replace creativity or business acumen, it supports it.”
As vice president of Hult’s AI Society, N-AIble, Rafael has seen this mindset in action. The society’s members explore AI ethically, using it to augment their work, not automate it. “These experiences have made me even more confident and excited about applying AI in the real world,” he says.
The AI learning tools students are using to improve understanding
In other business schools, AI is being used to offer faculty a second pair of hands. Nazarbayev University Graduate School of Business has recently introduced an ‘AI Jockey’. Appearing live on a second screen next to the lecturer’s slides, this AI tool acts as a second teacher, providing real-time clarifications, offering alternate examples, challenging assumptions, and deepening explanations.
“Students gain access to instant, tailored explanations that complement the lecture, enhancing understanding and engagement,” says Dr Tom Vinaimont, assistant professor of finance, Nazarbayev University Graduate School of Business, who uses the AI jockey in his teaching.
Rather than replacing the instructor, the AI enhances the learning experience by adding an interactive, AI-driven layer to traditional teaching, transforming learning into a more dynamic, responsive experience.
“The AI Jockey model encourages students to think critically about information, question the validity of AI outputs, and build essential AI literacy. It helps students not only keep pace with technological change but also prepares them to lead in an AI-integrated world by co-creating knowledge in real time,” says Dr Vinaimont.
How AI can be used to encourage critical thinking among students
So, if you’re looking to impress potential employers, learning to work with AI while a student is a good place to start. But simply using AI tools isn’t enough. You must think critically, solve problems creatively and be aware of AI’s limitations.
Most of all, you must be adaptable. GMAC’s new AI-powered tool, Advancery, helps you find graduate business programs tailored to your career goals, with AI-readiness in mind.
After all, working with AI is a skill in itself. And in 2025, it is a valuable one.
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