Thursday, May 01, 2025

 

Could Trump’s tariff war reshape global capitalism? An interview with Canadian Marxist economist Sam Gindin



Published 

sinking US dollar

Sam Gindin is a former research director for the Canadian Auto Workers union and Packer Visiting Chair in Social Justice at York University. He is also the coauthor of The Making of Global Capitalism: The Political Economy Of American Empire (with Leo Panitch), In and Out of Crisis: The Global Financial Meltdown and Left Alternatives (with Greg Albo and Panitch), and The Socialist Challenge Today (with Panitch and Stephen Maher), among other works. 

Speaking with Federico Fuentes for LINKS International Journal of Socialist Renewal, Gindin breaks down United States President Donald Trump’s on-again/off-again tariffs, their impacts on US-led globalised capitalism, and what a working-class response could look like.

Could you set out the context for Trump’s tariffs?

For a good many US people, the past four or five decades have brought deepening frustrations. Trump’s populist response has been to ask why, if the US is the leader in the globalisation of the world economy, have US people borne such a disproportionate share of the burdens but received such an unfair share of the benefits. Tariffs are, for Trump, the critical instrument to correct this. 

This poses three underlying questions: is it true that US people have been getting the short end of the stick within global capitalism? Does the root of popular frustrations, especially of US workers, lie in trade relations or is it homegrown — in the gross inequalities, permanent insecurities, cutbacks in social services and general failures of governments and political parties to improve working-class lives? And, if the issue is current and future jobs, can tariffs alone solve this concern? 

There is a further factor to consider. The US empire has, over the past eight decades, been defined by its drive to universalise free trade capitalism. How then does Trump’s dramatic focus on tariffs affect the future of the US empire?

In light of the US empire’s role in universalising capitalism, logic suggests the US capitalist class would not support the breakdown of this global economic order, and therefore oppose Trump’s tariffs? 

US capital looked to Trump to give them more of the usual goodies — significantly lower taxes, reversing regulations on capital (limited as they were), further limits on social programs — while blocking any advances in union rights. Trump promised to impose high tariffs, but US corporations saw this as only performative; they did not think Trump was mad enough to implement this part of his rhetoric. 

Tariffs do not just limit non-US capital. They directly and negatively affect US capital operating overseas, overseas supply chains affecting production in the US, and — assuming some retaliation — access to markets abroad. They raise the price of components and goods that they ship from abroad into the US. They also threaten to raise inflation, risk supply chain disruptions and retaliation, aggravate business uncertainties (especially Trump’s on-again, off-again, maybe-later-again arbitrariness) and make a recession more likely. So no, this is not something business was looking for. 

Is that why Trump hit pause on most of his announced tariffs?

Absolutely. The hubris of Trump and his advisors in bullying friends and allies abroad and expecting quick gains was quickly exposed. US business had been relatively silent but “markets” clearly spoke: stock markets sank, the sale of US Treasuries (government borrowing) faced higher interest rates, and the US dollar fell. A sobered Trump retreated to focus more on China. 

But even here Trump quickly retreated on Apple iPhones imported from China. Trump declared tariffs would be a tax on foreigners and shift costs abroad. But since the extraordinary tariffs on China would have led to an explosion in iPhone prices (or simply resulted in them not being shipped to the US), this caused a mini-rebellion among US consumers. So, Trump retreated, essentially admitting the obvious: tariffs were a tax that would largely be paid by Americans.

Selectively applied tariffs that are part of a larger strategy can have an impact. But tariffs as a shotgun approach, insensitive to the complex realities of capitalism’s global links, and with the delusion of a quick fix, cannot fulfill their promises. 

Trump claims his tariffs are about the US getting a better deal and are needed to address the country’s trade deficit. Is this true?

Far from the US getting the short end of the stick, the US trade deficit reflects unique US privilege as the imperial centre of global capitalism. Any other country with sustained trade deficits would be disciplined by “natural” economic dynamics. It would experience markets losing confidence in its currency, their currency falling in value, and higher import costs (as it would cost more in their currency to buy imports). Imports would consequently fall until they were more or less offset by equivalent exports. 

Not so, however, for the US. The US has run trade deficits every year since 1976 without being disciplined due to the US dollar’s universal status. The value of the US dollar was universally trusted and accepted. Consequently, the US kept getting more of the fruits of labour abroad without having to offer the products of US labour in exchange. This continues so long as the US remains economically strong and can stand behind the dollar, with the US Federal Reserve essentially acting as the world’s central bank, allowing the US to effectively “print” money. 

What of the claim that Trump wants to weaken the dollar to make US manufacturing more competitive?

First, Trump cannot go in two directions at once. His bravado nationalism includes pride in the strength of the dollar, so he would have a tough time going the other way. Second, weakening the dollar is possible, but not easy. If the US acted to lower the dollar, this may lead to other countries following its lead to protect their own competitiveness. Negotiating this with the rest of the world would be extremely difficult — part of the point of the US empire’s long-standing commitment to the rule of law and judgement of markets was to avoid the near impossibility of coping with the complexities and disruptions involved in this

Moreover, the method for carrying this out can prove very problematic. For example, one possible mechanism is for the US to introduce controls that limit the inflow of capital. This might work but comes with other possible consequences: a rise in US inflation as the lower dollar makes imports more expensive, and a shortage of capital (or capital only available at higher interest rates) for consumer and business borrowing. If this becomes more than an exceptional, temporary intervention, it threatens the workings of global financial markets, a key pillar of global capitalism. 

A more practical response might be avoiding alienating US allies and trying to bully China by focusing on China’s trade surplus with the US and negotiating a rise in the Chinese renminbi. But this would not contribute much, if anything, to US jobs. It would instead shift imports from China to countries made more competitive by the rise of the renminbi, and therefore shift the US trade deficit elsewhere. If the US then attacked these countries to correct its trade deficit, we would be back to Trump’s original disastrous attempt to hammer all countries with indefensible and outrageous tariffs. 

What about the claim these tariffs are a response to a more general crisis in capitalism or declining US power. Can these ideas help us better understand Trump’s actions?

I think this misses what is going on. There is a social crisis, not an economic crisis. US capital may not be doing as well as in the ’50s and ’60s, but that was a unique period in its history; it is not a standard by which to judge the present. Since the second decade of the 20th century, the US has gone through two world wars, a Great Depression and what some see as a “long downturn” since the mid-70s (itself half a century). The US has lost jobs, and it has even lost some entire industries, but the question is whether it has been able to adjust — an empirical, not theoretical question. And it certainly has.

If we measure US capital’s success in terms of profit growth, the wealth of corporate owners and, especially, the capacity to dominate the “commanding heights” of the global economy, the US’ record is impressive. It stands at the pinnacle of global high tech sectors (aerospace, pharmacare, biotechnology, health services, computers, software programs, AI) and crucial business services (engineering, legal, accounting, advertising and, of course, finance). And though the US state has not been able to prevent crises at home and within global capitalism — some quite serious — it has been able to contain them. 

The problem is not the weakness of US capital but that its successes have come at the expense of working people. The international economic crisis of the ’70s was turned from possible conflicts among capitalist states to internal wars on their working classes. Capital succeeded in solving that crisis, in good part on the backs of workers. The economic crisis for capital was converted into a social crisis for workers. 

Over time, that has morphed into a legitimacy crisis in part for capitalism, but primarily for capitalism’s political institutions (the state and political parties). It is the failure of the left to address this — the inter-related crises of unions and the socialist left — that allowed Trumpism to emerge. Yet, though the right can mobilise resentments, it has no ability to deliver on its promises to working classes. This defines the challenge for the left. 

So, can we say this crisis of legitimacy explains Trump’s motivations for the tariffs?

I do not know if it completely explains Trump’s motivations — there is a great deal of ignorance and bad economics in Trump’s head — but I do think tariffs reinforce Trump’s frenzied hyper-tariff political agenda. 

This agenda speaks to US nationalism. It diverts attention from the domestic war on workers and how workers’ lives could be far more significantly improved through domestic changes (universal healthcare, substantive access to higher education, affordable de-commodified housing, union rights) than tariffs. It tried to convince US workers that tariffs would replace the need for domestic taxes, and that the promised tax cuts for the rich would therefore not undermine social programs. 

It also reinforces the Cold War on China. But it must be kept in mind that tariffs themselves are not Trump’s main goal; they are only a tool for leverage in changing the larger distribution of costs and benefits within global capitalism to make it “fairer” to the US. 

Whether he can wring some pro-US changes out of his tariff madness and then exit tariffs, declaring that it was those other changes (for example, others paying a larger share of NATO’s costs and buying more equipment from the US, or an upward adjustment to the renminbi) remains to be seen. But along the way other problems  may hit the US and negatively impact the US empire. 

Could this tariff war not just negatively impact the US empire but even lead to China opting to economically decouple from the US?

Yes, but that depends primarily on the US. What is at stake here is not inter-imperial rivalry in the sense of contesting who will lead global capitalism. China does not want to replace the US and take on its responsibilities or burdens. It does not want to decouple, but is determined not to give in to bullying and thereby encourage more US aggressiveness. 

China’s goal is clear: its GDP per capita is only a fifth to a quarter of that of the US, so its primary concern is obtaining some recognition for its constructive role within global capitalism and continuing to develop under the aegis of the US Empire — that is why it often sounds like the main advocate for a “responsible” US Empire. 

The US too does not want to decouple, and risking it is also making its allies nervous. But the US, unsatisfied with its preeminent role in global capitalism and insisting on establishing and consolidating absolute power, risks a greater but unwinnable economic Cold War — or worse.

What possibilities are there that this might create space for Global South countries to pursue more autonomous development strategies?

I do not know. I would not put great weight on the US acting in its self-interest making it acceptable for others to do the same. We should not assume that the modal form of the US empire is over, with its insistence on the sovereignty of states being contingent on the sanctity of private sovereignty, the free flow of capital and the more general rule of markets. A return to “normal” — with or without Trump — is still possible. 

But the new “normal” will reflect the history of what we are living through and it is not clear to me how investors and states will modify the new order. Will China move to a greater dependence on internal markets or shift its exports from the US to Europe and the Global South? How will the Global South respond to a flood of such imports? Will Chinese capital support their development and use its trading surplus to further finance infrastructural developments in the Global South? Will Europe diversify away from a less dependable US and increase its links with China and the Global South? 

Most importantly, we must not treat states in the Global South as if each of them has a national consensus on what they want. Class struggles will affect their paths. Elites will perhaps prefer global economic ties to reinforce their power. Workers and peasants might, on the other hand, fight for a substantive sovereignty — one ready to challenge capitalist priorities and rules — and see their own elites as much, or more, of a problem than the US. 

Given this, how should working-class forces respond to Trump’s tariff war?

A difficult question. I will flag some suggested orientations. First, as noted earlier, domestic issues — what our governments have done or neglected to do for us — have had a much greater impact on working-class lives than the import of cheaper products from abroad. We must not let this be pushed aside by the focus on tariffs.  

Second, it is not all that helpful to simply criticise workers’ support for tariffs. The alternative of no tariffs means free trade, which has augmented capital’s freedoms to allocate its investment and jobs according to its own, undemocratic, priorities. Free trade has been part of weakening and harming the working class.  

Tariffs can potentially play a positive role but — and here is the rub — only if they are part of broader policies to restructure the economy in a socially beneficial way. A short detour to the Ronald Reagan administration’s response to the auto crisis in the mid-80s might help clarify this point. 

Reagan used trade pressures to force Japanese companies to shift from exports to establishing plants in the US. Autoworkers, desperate for some security, cheered the state for “doing something concrete”. But Japanese auto companies did not go where the job losses were. They went to the non-union US south. 

With their brand-new plants, absence of legacy pensions costs, and no pressure to incorporate workers’ rights, they outcompeted the plants in the US north. Jobs did come to the US, but unionised autoworkers were no more secure than before. Soon, these Japanese plants, not the United Auto Workers, were effectively setting standards for the industry. 

Today, auto is no longer the job creator it was. The market for new cars is relatively saturated. That, combined with the steady beat of productivity improvements, spells fewer jobs. As electric vehicles (EVs) — which require less hours of labour per vehicle — replace gas-propelled vehicles, the outlook for jobs is further downgraded. Add to this that the transition to EVs will have to occur, but the US badly lags China despite being so far ahead a few short years ago, and it is hard to see tariffs on their own being much of a solution. 

Third, we must not fetishise manufacturing jobs as inherently “good” jobs. They have historically had the best pay and benefits, but only by way of workers unionising into militant, creative unions. Moreover, the quality of manufacturing jobs has significantly fallen and, in any case, only some 10% of jobs in the US and Canada (less in Australia) are now in the manufacturing sector. Improving the status and quality of service jobs — the jobs many workers in manufacturing will someday have and their kids will most likely have — is the critical challenge. 

Fourth, manufacturing capacity is nevertheless crucial to all countries as part of their restructuring to meet changing needs. This is especially the case regarding the environment. Addressing the environmental crisis demands transforming everything about how we work, travel and live. This implies having the tools and products to transform factories, housing, infrastructures. 

To let facilities close because they do not earn enough profits would in this case be criminal; we need to hang on to these and convert them into producing, by way of national plans, what is socially valuable. This does not mean rejecting trade or some degree of specialisation in particular products. But it does mean both managed or planned economic development and managed, mutually beneficial trade. 

In short, the problems workers face require more than tinkering with the status quo. They call for finally recognising that a socio-economic system based on corporations competing for profits cannot bring workers more secure and fulfilling lives. This is not just a matter of listing better policies but a fundamental question of where power lies and how power itself is transformed. The bottom line is how to build the working-class into a social force with the vision, commitment, confidence and collective organising skills to change the world. 

 

Loss of genetic plant diversity is visible from space



Increased vegetation growth in European mountains, driven by climate and land use changes, reduces genetic diversity of medicinal plants, as shown by a new study using satellite data and genetic analyses on Greek mountain tea.




University of Copenhagen - The Faculty of Health and Medical Sciences





Mountain regions are hotspots of biodiversity and represent some of the most species-rich habitats overall. However, these diverse ecosystems are being rapidly transformed by global change.

Over the past five decades, rising temperatures and changes in land use at high altitudes have encouraged the growth and spread of highly competitive plants such as shrubs and trees – a process known as “mountain greening.” The specialized and often low-growing species of open grassland habitats are being pushed back as a result.

Sideritis, a characteristic and important plant of the montane grassland flora in the Mediterranean region, is also affected by this development. The herb, also known as Greek mountain tea, comprises several closely related species and is used by the local population and the pharmaceutical industry due to its healing properties for coughs, colds, and gastrointestinal complaints.

At the same time, the popular medicinal plant is an indicator of the health of open mountain habitats.

As part of the recently published study, the research team investigated the effects of increasing greening on the genetic diversity of Sideritis, using an innovative methodological approach:

-We examined populations in eleven Greek mountain ranges and combined satellite data from several decades with genetic analyses of herbarium specimens from the 1970s and present-day plant samples, explains study leader Spyros Theodoridis, a former research associate at the Senckenberg Biodiversity and Climate Research Center in Frankfurt, who now works at the National Observatory of Athens.

-The results show that in eight of the eleven mountain regions we studied, genetic diversity declined significantly during this period. In particularly affected regions, up to 20 percent of the genome of individual plants is now subject to inbreeding – an indication of declining population sizes.

-The speed at which shrubs and trees are spreading in previously open grasslands can be directly linked to the decline in genetic diversity in Sideritis populations,” adds co-author David Nogués-Bravo, Professor at the University of Copenhagen, and continues:

-The genetic diversity of a species is crucial for its ability to adapt to environmental changes. If this diversity dwindles, resistance to disease, drought, or other stress factors decreases, which can lead to extinction in the long term.

Satellite data reveals consequences of global warming

A special aspect of the study is that it combines two entirely different data sources – remote sensing by satellite and genomic analyses – thus allowing conclusions to be drawn about the development of plant populations over several decades: -This combination opens up new possibilities for biodiversity monitoring, emphasizes Spyros Theodoridis and continues: -It allows us to use satellite images to identify indications of genetic changes in mountain ecosystems without having to genetically examine each individual population on site.

Monitoring the loss of genetic diversity from space was previously considered impossible.

-However, our results show that the extent of genetic erosion can be predicted with surprisingly high accuracy based solely on the increase in vegetation density, adds co-author Thomas Hickler, Professor at the Senckenberg Biodiversity and Climate Research Center.

-This renders our method particularly attractive for use in mountainous regions that are difficult to access or in areas where genetic monitoring has hardly been possible to date.

The study also underlines the importance of natural history collections, explains Marco Thines, co-author and Professor at Senckenberg Biodiversity and Climate Research Center.

-Without the historical plant specimens in herbaria, the direct comparison over a period of 50 years would not have been possible. These archives of nature are invaluable for biodiversity research.

The increasing greening of mountain regions due to global warming and the abandonment of traditional forms of cultivation is widespread around the world and is clearly evident from satellite images.

The researchers therefore recommend that conservation measures should be prioritized in areas that are most severely affected by mountain greening:

- There is an urgent need for comparable studies with other species and in other regions, concludes Theodoridis:

-This will allow us to gain a comprehensive picture of how environmental changes are affecting the genetic basis of biodiversity – and how we can effectively counter this development.

 

Cornstarch sanitary pads cheap enough to avoid tonnes of ocean plastics



IOP Publishing
Cornstarch sanitary pads cheap enough to avoid tonnes of ocean plastics 

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Cornstarch sanitary pads cheap enough to avoid tonnes of ocean plastics 

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Credit: IOP Publishing





new lifecycle study published in IOP Publishing’s journal Sustainability Science and Technology has discovered a promising alternative to plastic sanitary products, potentially leading to far reduced sanitary waste. Sanitary pads made with cornstarch are 17 times more environmentally friendly compared to plastic equivalents.

The high concentration of plastic in disposable products is a direct threat to the environment. An estimated 200,000 tonnes of sanitary products are disposed of every year, and the vast majority of them end up in the ocean.

Key statistics:

  • Sanitary pads made with cornstarch are 17 times more environmentally friendly compared to plastic equivalents.
  • Each menstruating person uses approximately 120kg of menstrual products in their lifetime
  • Sanitary pads are made from 90% plastic, corresponding to about 4 plastic bags
  • 55,000 tonnes of plastic sanitary waste per year ends up in North American bodies of water

Scientists found that, over the course of one year, using a cornstarch derived biodegradable material called polylactic acid (PLA) to create sanitary products reduced environmental impact by 17 times compared to the plastic equivalent. The PLA based pads exhibit lower global warming potential and far reduced toxicity due to the material’s more sustainable manufacturing processes compared to fossil-based plastics.

Even taking into account that the production of PLA contributes to higher land use, the overall renewable sourcing and lower environmental footprint mitigate the environmental impacts, in comparison to disposable plastic products.

Sustainable alternatives to traditional sanitary products remain underused by large companies, as they require commercial quantities to make these high-street products viable and affordable. Cornstarch based products are easily producible and can be scaled so that large companies could use it as an effective and sustainable alternative.

Corn is one of the most widely grown crops in the world and is used for a variety of purposes, including food for humans and livestock, biofuel production, and as a raw material in many industrial products. The global trade of corn involves many countries, making it a significant player in the international trade market and enabling large companies to buy large quantities.

Alice Medeiros de Lima, corresponding author of the study, says: “Research into sustainable sanitary materials has consistently shown that while many alternatives to traditional products exist, the key to widespread adoption lies in ease of production, price and scalability. Given the detrimental effects of plastic based sanitary products on the environment, transitioning to cornstarch- based products can significantly reduce waste and provide a more sustainable solution for the future.”

 

ENDS

About IOP Publishing  
IOP Publishing is a society-owned scientific publisher, delivering impact, recognition and value to the scientific community. Its purpose is to expand the world of physics, offering a portfolio of journals, ebooks, conference proceedings and science news resources globally. IOPP is a member of Purpose-Led Publishing, a coalition of society publishers who pledge to put purpose above profit.   

As a wholly owned subsidiary of the Institute of Physics, a not-for-profit society, IOP Publishing supports the Institute’s work to inspire people to develop their knowledge, understanding and enjoyment of physics. Visit ioppublishing.org to learn more.  

 

About the authors
This research was led by Prof. Alice Medeiros Lima from the Department of Chemical Engineering at the Federal University of São Carlos (UFSCar), in collaboration with Prof. Sandra Cristina Dantas from the Federal University of Triângulo Mineiro (UFTM). The study was developed as part of the research line on Sustainable Process Systems Engineering, with a focus on life cycle assessment (LCA) and bio-based alternatives. It involved the contribution of undergraduate students who were actively engaged in research activities and have since progressed to work in major chemical industries in Brazil. The project reflects a shared institutional commitment to advancing sustainable technologies and strengthening academia–industry connections.

 

New research reveals how physiology-inspired networks could improve political decision-making




Columbia University's Mailman School of Public Health





New York, NY — A study led by researchers at the Columbia Butler Aging Center and the Columbia Mailman School of Public Health has unveiled a groundbreaking framework for rethinking political decision-making—drawing inspiration from how the human body maintains stability and health. The findings are published in the npj Complexity, a Springer Nature publication.

By using simulations modeled after physiological systems, the researchers explored how networked structures of decision-makers can be designed to balance democratic values, efficiency, and technical limitations.

“Many existing political systems are inefficient, unstable, or undemocratic,” said Alan Cohen, PhD, associate professor in the Butler Columbia Aging Center, and Principal Investigator on the study. “In our simulations, we found that while no single structure is perfect, some governance models are clearly more effective than others.”

Cohen explains that the human body—honed by billions of years of evolution—offers a powerful analogy for organizing complex decision-making. “Our physiological systems constantly integrate signals and make decisions that maintain equilibrium. We applied a similar logic to political structures,” he said.

The research focused on a model where small, interconnected subgroups operate within larger populations, allowing decisions to emerge through a structured, bottom-up process. This network-based model enables populations to make complex decisions efficiently while still reflecting the will of the broader group.

“Our findings highlight the value of decentralized, structured decision-making,” noted Cohen, who is also associate professor of Environmental Health Sciences at Columbia Mailman School of Public Health. “The way these groups are organized—and the connections between them—can fundamentally shape the outcomes.”

Despite the promise of the model, Cohen emphasizes that several important questions remain: How large should decision-making groups be? How should participants be selected? How many connections—or "bridges"—should exist between groups?

“There are also behavioral dynamics to consider,” Cohen added. “What happens when some individuals dominate the discussion or refuse to reconsider their positions?”

Other critical dimensions, such as public satisfaction with decisions and the system itself, are more challenging to incorporate into the model but are vital for real-world applications. The potential for innovation—how group discussions spark novel solutions—also remains an open area for future study.

“While challenges remain, our research shows that a complex systems and modeling approach to governance offers a powerful lens through which to understand and improve decentralized decision-making,” said Cohen. “This could open the door to more resilient, adaptive political systems in the future. This first study is a proof-of-concept: it shows that we can derive models of effective governance inspired by biological networks. Future work will illuminate the best ways to do that. Given the current state of politics, I think we’d all agree there is a pressing need for more robust political systems.”

Co-authors are Laurent Hébert-Dufresne, Nicholas W. Landry, Juniper Lovato, Jonathan St-Onge, Jean-Gabriel Young from the University of Vermont; and Marie-Ève Couture-Ménard and Stéphane Bernatchez, and Catherine Choquette, Université de Sherbrooke, Canada

The study was supported by the Fonds de recherche du Québec through an Audace award and by The Alfred P. Sloan Foundation.

Columbia University Mailman School of Public Health

Founded in 1922, the Columbia University Mailman School of Public Health pursues an agenda of research, education, and service to address the critical and complex public health issues affecting New Yorkers, the nation and the world. The Columbia Mailman School is the third largest recipient of NIH grants among schools of public health. Its nearly 300 multi-disciplinary faculty members work in more than 100 countries around the world, addressing such issues as preventing infectious and chronic diseases, environmental health, maternal and child health, health policy, climate change and health, and public health preparedness. It is a leader in public health education with more than 1,300 graduate students from 55 nations pursuing a variety of master’s and doctoral degree programs. The Columbia Mailman School is also home to numerous world-renowned research centers, including ICAP and the Center for Infection and Immunity. For more information, please visit www.mailman.columbia.edu.

 

Intensifying farmland can sometimes degrade biodiversity more than expansion



University College London




The intensification of existing farmland can sometimes be more harmful to local biodiversity than expanding the area covered by agricultural land, finds a new study led by University College London (UCL) researchers.

They showed that neither expansion nor intensification is consistently better for biodiversity, as it varies by factors including region, crop type and local vegetation.

The findings, published in Nature Ecology & Evolution, challenge the conventional wisdom in favour of intensification, that encourages farmers to improve the productivity of existing farmland with techniques such as increased fertiliser and pesticide use.

Lead author Dr Silvia CeauÈ™u (UCL Centre for Biodiversity & Environment Research, UCL Biosciences) said: “Feeding the global human population comes at an increasing cost for our planet’s biodiversity. To mitigate this, the common assumption is that intensifying agricultural practices is always less detrimental to biodiversity than farmland expansion.

“But our new research highlights that it’s actually more complicated than that. We show that farmland expansion is indeed drastically changing local biodiversity. However, once agriculture is established, intensifying agricultural practices can further degrade local biodiversity, sometimes more so than by further removing natural vegetation from the area.

“Our findings suggest that closing 'yield gaps'—maximising production on existing agricultural land in a given area—could come at a higher ecological cost than previously thought.”

The researchers conducted a global assessment of the impacts on biodiversity from farmland intensification or expansion, using a large biodiversity database, natural vegetation data, and agricultural yield estimates. They looked at existing agricultural areas (with varying amounts of natural vegetation near the farms; natural areas without any agriculture were excluded) producing maize, soybean, wheat, and rice, four common crops that together represent over half of the total global calorie production.

To measure biodiversity, the scientists looked at species richness (how many different species are in an area), total abundance (how many individuals there are of each species) and the geographical distribution of each species, and they looked at this both in the agricultural area and the surrounding areas.

The researchers found that overall, increasing crop yields by either route is harmful to biodiversity. But as for whether expansion or intensification was more or less harmful, it varied depending on the context, in terms of the region, crop type, or characteristics of the remaining natural vegetation, as well as which measure of biodiversity was used.

The study authors say their findings could have relevance to global agricultural policies and trade initiatives, particularly those aimed at curbing deforestation, as some have requirements for crops to come only from established farmland, which the researchers say may be an oversimplification of the evidence.

While the data is very complex to determine in which situations expansion or intensification is less harmful, they suggest that farmers could at least focus on sustainable intensification techniques, such as biological pest controls and keeping patches of natural vegetation between fields. For consumers, given the complexities involved in determining the sustainability of different products, the researchers suggest reducing food waste and meat consumption.

Co-author Professor Tim Newbold (UCL Centre for Biodiversity & Environment Research, UCL Biosciences) said: “Finding the most sustainable way to increase crop yields is very complicated and depends on numerous factors, so simple suggestions like favouring farmland intensification over expansion are not always effective – there’s no one-size-fits all solution for sustainable agriculture.”

The researchers caution that their study only looked at existing agricultural areas, and does not suggest that cultivating natural areas would be appropriate.

“We would not suggest expanding farmland into intact natural areas as it is vital for the planet that such unmodified landscapes are preserved,” added Dr Newbold.

Co-author David Leclère (International Institute for Applied Systems Analysis, Austria) said: “In order to protect biodiversity while meeting food demand, we may need to rethink how we balance expansion and intensification in agriculture. There is likely a balance that can be struck between intensification and expansion in agricultural landscapes, informed by local and crop-specific data and considering the full range of environmental impacts.”

The study was supported by the UK Global Challenges Research Fund Trade, Development and Environment Hub.

 

Study opens the door for stronger evidence in bomb handling cases




King's College London





Scientists have for the first time provided insight into how bomb residue transfers to the hands of suspects, which could lead to stronger evidence in court.

The study, which was led by a team from King’s College London and published today in the journal Science & Justice, investigated how explosive materials commonly found in pipe bombs and improvised explosive devices (IEDs) transferred to the palms and fingers of individuals who handled them. The researchers learned that the amount that was handled and the unique characteristics of the handler were important determining factors. Surprisingly, the brand or type of material appeared not to be a decisive influencing factor.

The study is the first of its kind to explore how contextual factors influence explosive material residue transfer to hands, and could be used to help forensic experts in cases involving explosive materials.

Lead author, Dr Matteo Gallidabino, Lecturer in Forensic Chemistry at King’s College London, said: "These findings could mark a breakthrough in forensic investigations into individuals who are suspected of handling explosive materials. Currently, forensic experts can identify the presence of explosive material-related molecules on hands, but interpretation rarely goes deeper than that because of a lack of contextual data.

“This study is a first step towards understanding how a range of contextual factors influence how residue is transferred. Developing this understanding is critical if we want forensic evidence to truly be helpful in understanding what happened in a case. The results provide a foundation that can help experts better interpret residue in cases involving the use of energetic materials, such as terrorist attacks, leading to stronger and more reliable conclusions in court.”

Often used in the construction of IEDs, smokeless powders (SLPs) are a common and easily available material. In some countries, they can be bought over the counter by people seeking to manually load their own gun cartridges. The powder residues can be detected by hand swabs applied to suspects following a bombing incident. Currently, analysts primarily focus on determining whether explosive-related molecules are present, and when possible, what type of explosive was involved. However, due to a lack of data on background levels and persistence of powder, as well as secondary transfer – by way of actions such as shaking hands or touching surfaces - assessment of whether a suspect actually handled an explosive remains limited.

The research team conducted controlled experiments where volunteers handled different SLP samples containing common additives – namely diphenylamine (DPA), dibutyl phthalate (DBP) and ethyl centralite (EC). The volunteers were instructed to wash their hands thoroughly with soap and water before rubbing samples of SLP between their palms for 30 seconds. They were then asked to clap their hands to dislodge loose particles. This was followed by swabs being rubbed on their hands to collect a sample.

The researchers then used a streamlined ‘filter and shoot’ method – a simple and fast sample preparation technique used in analytical chemistry - that was optimised for the experiment, before analysing the samples using gas chromatography-mass spectrometry.

The results showed that the quantity transferred to hands ranged from in the billionths to in the millionths of a gram. DBP was the most concentrated additive in all SLP samples, followed by DPA and EC—a pattern also seen in the hand residues. However, the specific concentrations of these additives which varied across SLPs were not mirrored in the hand residues. The researchers were surprised by this finding,  indicating that the type or brand of SLP is not a key influencing factor.

 

The unique characteristics of the handler also influenced residue transfer. These included physical characteristics – such as skin properties, and behaviours – such as how the powder was handled and the force applied. While not directly measurable, these factors caused the final amount transferred to differ from person to person.  In addition, the amount of SLP found on the hands correlated with the total mass of SLP handled.

The results indicate the importance of taking contextual factors into account when investigating explosive residue traces in real cases.

The study also introduces a faster and more robust sampling method – the optimised filter and shoot technique – that could be used for future research studies.

Dr Gallidabino calls for future research to look at a wider range of chemical substances associated with explosives, as well as to study related retention and persistence of SLP traces on hands.