A new approach to cutting marine plastic pollution

Every year, many millions of tons of plastic end up in the ocean. It’s a serious and rapidly increasing environmental problem.

NTNU researchers are now looking for a solution that can address this nightmare at its root.

“The solutions we have today mostly concern cleanup after we’re done with the plastic. We sort, we recycle and we pick up plastic on the shore. But what about approaches that completely change the way we produce and consume plastic?” said Natalya Amirova. She is a PhD research fellow at NTNU’s Department of Psychology and part of an interdisciplinary research team at the university.

The team is working to identify the main sources and solutions for plastic pollution in Norwegian marine and coastal areas.

“Marine plastic litter is a huge problem for the marine ecosystem. So far, we lack good solutions to stop this flow of plastic going astray,” says project coordinator Siv Marina Flø Grimstad, associate professor at the NTNU School of International Business in Ålesund.

Examined more than 50 measures

With the goal of helping society move towards plastic-free oceans, the project is exploring approaches related to economics, technology and psychology. Amirova’s approach is to use a holistic and psychological approach as she looks at the long list of measures that have been implemented in Norway in recent decades.

PhD candidate Natalya Amirova at the Department of Psychology, NTNU SHOW MORE

“Plastic pollution is a complex social problem. So we’re looking for ways to help change the system itself. We’re looking for measures that can completely change the way we think, whether we are producers, politicians or consumers,” she said.

Amirova reviewed 52 Norwegian measures, the earliest of which was from the 1980s.

They include practical measures such as annual beach clean-ups, collecting old fishing nets from the seabed, removing microplastics from wastewater and using degradable plastic in fishing gear.

But she has also looked at overarching approaches such as information campaigns, source sorting, and web-based map services that show lost fishing gear in the sea.

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A lot of cleanup, not much reduction

The review showed that most of the approaches rely on recycling, cleaning beaches, removing microplastics and using alternative materials, without addressing the actual cause of the pollution.

Other studies also show that measures to control  plastic pollution in Norway primarily rely on clean-up and recycling.

Only three of the more than 50 measures she looked at were considered to be able to bring about profound changes:

• The municipal network KIMO (the International Organization of Local Authorities)
• The Government’s strategy for a circular economy
• International Ocean Panel

The common thread for these measures is that they emphasize so-called pro-social and pro-ecological values (values that put the environment, human welfare and the community at the center).

• The KIMO network highlights political equality and environmental protection
• The circular economy strategy is motivated by ecological sustainability
• The Ocean Panel promotes responsible ocean management

Opting out of behaviour that benefits society

At the same time, Amirova and her colleagues have identified some clear limitations in these approaches.

All three lack defined goals and deadlines, making it difficult to evaluate whether they have any impact on the plastic problem.

“The Ocean Panel and the Government’s strategy for a green circular economy are also characterized by external values, meaning values that are motivated by rewards, recognition or goals outside the activity itself, where they prioritize economic prosperity over the health of the oceans,” Amirova said.

“Societal materialistic values include financial success, status and economic growth, and the like. At the other end of the value spectrum, we have intrinsic values, such as social equality, environmental and human health and well-being, art and creativity,” she said.

A news story that describes the ocean as the world’s seventh largest economy gives us a materialistic view of the ocean.

Research shows that if we are more exposed to materialistic values, we tend to choose behaviours and decisions that are associated with those values, while at the same time opting out of behaviours that benefit society and the environment. The American psychologist Tim Kasser and his work on social change says that approach won’t work, she said.

“Kasser says societal changes can only occur when decision-makers at different levels of society are exposed to and act in line with pro-social and pro-ecological values, rather than materialistic values and goals,” she said.

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A question of influence

All these different values are communicated to us in different ways, she says.

If you are in the middle of Times Square in New York, you will be surrounded by advertising posters to buy things. If, on the other hand, you stand in the centre of Trondheim, you will be surrounded by different messages, including pro-social and pro-ecological ones. You might find notices urging the people not to throw trash in the toilet, or posters for festivals and museums.

“Today, social media in particular, with news and advertisements, helps determine how we behave on a daily basis. This also applies to how we view the sea,” Amirova said.

“A news story that describes the ocean as the world’s seventh largest economy gives us a materialistic view of the ocean,” she said.

“But the ocean is not just about money, it also contributes to our physical and mental health. There are social and ecological values associated with the ocean. When we make decisions, we should keep this in mind and not perceive the ocean solely as a commodity.

Amirova talks about marine plastic litter in this video. The story continues below the video.

The study, published in PLOS Sustainability and Transformation in June this year, includes suggestions for how to strengthen the potential for change, where more emphasis is placed on the intrinsic value of the ocean.

The authors emphasized three concepts:

• relational environmental thinking (where the relationship between humans and nature is mutual and intertwined)
• Circular economy
• Ocean stewardship.

More “zero waste” in the cityscape

The researchers suggest replacing economics as an indicator of progress, and instead using measures of the state of ocean health as an indicator.

“This would allow authorities to assess measures based on water quality, biodiversity and other indicators, rather than prioritizing economic indicators,” Amirova said.

All the participants in the Sweet Spot project. Photo: Siv Marina Flø Grimstad SHOW MORE

They also suggest that clear goals and timelines be established for the reduction of plastic waste early in the plastics value chain, as well as increased support for grassroots initiatives and small-scale businesses that work to avoid or reduce plastic production and use.

“For example, by supporting local initiatives and small businesses that have a “zero waste” profile, you can increase their presence in relation to the large companies.  This can not only reduce plastic consumption, but also support local communities,” Amirova said.

The researchers also propose reducing the proportion of “profit-based advertising” in favour of “non-profit” messages. They also suggest promoting less materialistic societies with more circular lifestyles.

Grimstad believes Amirova’s work is important, because the problem of marine plastic litter is greater than ever, despite increased focus.

“If we are to have any hope of improving the situation and avoiding having more plastic than fish in the world’s oceans in 2050, as many predict, we must have a change of attitude all the way down to the individual level. This in turn has to lead to behavioural changds, which is what Natalya is focused on,” Grimstad said.

Reference:
Natalya Amirova, Maraja Riechers, Isabel Richter: Assessment of the transformative potential of interventions in addressing coastal and marine plastic pollution in Norway: A literature review PLOS Sustainability and Transformation, Published: July 23, 2025 https://doi.org/10.1371/journal.pstr.0000186