JasminkaM/Shutterstock

Every week, the average UK household throws away dozens of pieces of plastic packaging. When people actually start counting them, they’re often shocked to discover just how much there is. And unfortunately, most of this plastic cannot be reused, refilled or recycled.

That’s one of the main findings from our new research on the Big Plastic Count, a nationwide citizen science campaign organised by social enterprise Everyday Plastic in collaboration with environmental campaign charity Greenpeace. Involving more than 160,000 UK households, it’s one of the largest efforts ever to track household plastic waste in the world.

Our analysis combined the Big Plastic Count data with an attitude survey of more than 8,000 plastic count respondents and an experiment on public engagement. It showed that taking part in “citizen science”, research carried out with the public rather than on the public, can do much more than generate data. It can bring a sense of urgency to an environmental problem, change behaviour, and even mobilise political action.

People tend to overestimate the positive environmental impact of recycling. Many participants began the project confident they were already making environmentally friendly choices, for example buying recyclable packaging. But when they actually counted their weekly plastic waste, the results told a different story.

The typical household generated 20-30 items of plastic in just one week, mostly soft plastics such as film lids, crisp packets and food wrappers. These items, despite often carrying positive environmental messages, are impossible to reuse or refill, and are rarely recycled in practice.

This gap between perception and reality, what we call “plastic blindness”, reveals a crucial barrier to tackling plastic pollution. People simply don’t see how much plastic they use or misunderstand, or perhaps are misled as to what happens to it after disposal.

This blindness was especially pronounced among online shoppers, who tended to underestimate their plastic consumption the most. Having packaging arrive neatly at the door seems to obscure the sheer volume of waste produced in the process. This suggests the need for more visible waste information – and better ways to help consumers choose lower waste options.

When we see it, we care more

The act of counting plastic waste had a powerful psychological effect. Participants who tracked their own waste reported feeling more aware and more concerned about the plastic waste they were generating – and more open to alternatives such as refill and reuse systems.

pile of green black and clear plastic packaging
It can be hard to visualise how much plastic waste households throw away every day. JasminkaM/Shutterstock

These models, where customers use their own containers or borrow returnable ones, are widely seen as essential to a circular economy. Yet their success depends, along with supportive policies, on public understanding of why recycling and other waste management strategies are not enough to tackle plastic pollution.

By making the invisible visible, citizen science can help close that understanding gap. Participants who saw their plastic waste laid out in front of them were far more likely to express concern about pollution and to support stronger policies on plastic reduction.

Citizen science can spark action

We found that awareness translated into political engagement. Participation in the Big Plastic Count coincided with a significant increase in signatures on a Greenpeace petition launched at the same time, calling for stronger action in the ongoing global plastics treaty negotiations.

This suggests that citizen science isn’t just a way to collect data. It can also mobilise public support for policy change. When people see clear evidence of a problem that they have limited control over, they’re more motivated to demand systemic solutions.

Our findings add to growing evidence that recycling alone cannot solve the plastic problem. In the UK, the Everyday Plastic study showed that only around 17% of household plastic waste is actually recycled, while most ends up being incinerated, exported or put into landfill.

Policies that focus solely on end-of-life solutions ignore the need to reduce plastic production at its source. That’s why policy must look upstream. The global plastics treaty, a United Nations initiative aiming to reduce plastic pollution worldwide, could commit countries to legally binding limits on virgin plastic production and enforce stronger requirements for reuse and refill systems.

The results of the Big Plastic Count show that when people are given the opportunity to see their own contribution to the plastic problem, they want to see change – and they expect policymakers to lead it.

Quite simply, we can’t fix what we can’t see. Plastic pollution is often hidden in plain sight – behind positive “eco” or “recyclable” labels, messages such as adverts normalising single-use plastic use, within supply chains and under the convenience of online shopping.

Citizen science initiatives such as the Big Plastic Count help to lift that blindfold, empowering citizens not just to count plastic, but to count in the movement for change.

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This article is republished from The Conversation, a nonprofit, independent news organization bringing you facts and trustworthy analysis to help you make sense of our complex world. It was written by: Kate Whitman, University of Portsmouth; Cressida Bowyer, University of Portsmouth, and Steve Fletcher, University of Portsmouth

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Cressida Bowyer receives funding from the Arts and Humanities Research Council (AHRC), the Medical Research Council (MRC), the Economic and Social Research Council (ESRC), the Wellcome Trust, the Sustainable Manufacturing and Environmental Pollution Programme (SMEP) and the Flotilla Foundation. She is a member of the British Plastics Federation Sustainability Committee.

Steve Fletcher receives funding from the World Economic Forum, Natural Environment Research Council (NERC), Economic and Social Research Council (ESRC), Aquapak Ltd, Defra, and the Flotilla Foundation. He is a member of the United Nations International Resource Panel and is the NERC Agenda Setting Fellow for Plastic Pollution.

Kate Whitman does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.