Kategorie: News
Between innovation and ecological reality
Why The Ocean Cleanup is impressive but won’t save us: two tugboats are pulling a 2.2-kilometre-long barrier through the Pacific. In the collection point: fishing nets, plastic bottles, canisters – visible evidence of our throwaway culture.
The Ocean Cleanup’s System 03 is technically impressive, effective in the media and undoubtedly well-intentioned. Yet on closer inspection, an uncomfortable truth emerges: what is being fished out of the sea here is only the tip of the iceberg – in the truest sense of the word.
The paradox of visible successes
The striking images of the Great Pacific Garbage Patch show what the system captures: large pieces of plastic, which together account for around 75 per cent of the total mass of this carpet of rubbish. It sounds like a remarkable success. But the reality is quite different: these large pieces represent less than six per cent of all plastic particles in the garbage patch. The remaining 94 per cent are microplastics – tiny particles that slip through the mesh of the barrier, remain invisible in press photographs and pose by far the greater ecological problem.
Microplastics enter the food chain, are ingested by everything from plankton to whales, and accumulate in organisms. They carry pollutants, disrupt reproductive cycles and ultimately end up on our plates too. The Ocean Cleanup system cannot tackle this problem – it is simply not designed for it.
The maths doesn’t add up
The Ocean Cleanup touts impressive figures: the area of a football pitch every five seconds. What sounds like a tremendous achievement merely describes the area swept by the barrier – not the amount of plastic actually removed. According to its own figures, around 144 tonnes were retrieved from the Great Pacific Garbage Patch in 2024. A figure that, taken on its own, seems considerable.
But the context is sobering: the garbage patch contains at least 79,000 tonnes of plastic. Every year, between eight and twelve million tonnes of new plastic waste enter the oceans worldwide. Even if The Ocean Cleanup were to increase its capacity tenfold, it would be little more than a drop in the ocean – or rather, a drop in the ocean.
Collateral damage in the floating ecosystem
What at first glance looks like lifeless rubbish has, over decades, developed into a habitat in its own right. Algae, crustaceans, barnacles and countless microorganisms have settled on and amongst the pieces of plastic. This ecosystem, known as the ‘Plastisphere’, may be unnatural and problematic – but it is alive.
When tonnes of plastic, along with everything growing on it and swimming within it, are removed from the sea, countless living creatures die. Juvenile fish seeking shelter amongst floating plastic, crustaceans, jellyfish and plankton – they are all collected along with the rubbish. The long-term ecological consequences of this ‘bycatch’ have scarcely been researched, yet are consistently overlooked in public discourse. We would like to see more openness here and, above all, further research.
Money that is lacking elsewhere
Since its foundation, The Ocean Cleanup has raised several hundred million dollars in donations and investments. This money comes from environmentally conscious individuals, foundations and companies that want to solve the plastic problem. The question is: is this money being used where it will have the greatest impact?
Studies clearly show that around 80 per cent of marine plastic originates from just ten river systems, predominantly in Asia and Africa. Here, at the source, a fraction of the cost could achieve many times the impact. Waste collection systems in rivers (see also the section: A silver lining: river barriers), improved waste management in coastal regions, and recycling infrastructure – all of these prevent plastic from entering the sea in the first place.
One euro invested in prevention has an impact that is orders of magnitude greater than one euro spent on deep-sea clean-up. This is because once something is in the ocean, it is virtually impossible to retrieve it efficiently – certainly not the microplastics that have already spread to the remotest corners of the world’s oceans.
Between recognition and criticism
Despite all the justified criticism, The Ocean Cleanup deserves recognition. The initiative has brought the issue of plastic pollution to the forefront of public awareness, inspired young people to care about environmental protection, and demonstrated that technical innovation can make a difference. The founder, Boyan Slat, pursued a dream as a teenager and realised it in the face of considerable opposition – that is admirable.
Yet admiration must not blind us. A solution that primarily removes large pieces of plastic, whilst the microplastic problem continues to grow, is not a comprehensive response to the crisis. A technology that tackles a tiny fraction of the problem at enormous cost, whilst many times that amount of new waste flows in every year, is like trying to empty a swimming pool with a teaspoon – whilst the tap is running.
What really helps
The solution to the plastic crisis does not lie on the high seas, but on land. It begins with political decisions: bans on single-use plastics, deposit-return schemes, extended producer responsibility. It continues with better infrastructure: waste collection in emerging economies, sewage treatment plants capable of filtering out microplastics, and recycling facilities that actually work.
And it ends with us. By doing without unnecessary packaging, by consuming consciously, by being willing to pay more for sustainable alternatives. Every plastic bottle that isn’t produced in the first place doesn’t need to be fished out of the ocean.
Fitting river mouths in South-East Asia with floating barriers costs a fraction of what The Ocean Cleanup consumes – and prevents thousands of tonnes of plastic from entering the sea in the first place (see also the section: A silver lining: the river barriers). Local initiatives in Indonesia, the Philippines and India, which collect rubbish before it reaches the river, operate on minimal budgets yet achieve maximum impact. They also create jobs and strengthen local communities.
Symbolism has its place – but also its limits
The Ocean Cleanup is a symbol. A symbol that we are not indifferent to the problem. A symbol of technological progress and human creativity. Yet symbols do not solve crises – they make them visible, tangible and emotionally accessible.
The danger lies in the fact that spectacular technologies lull us into a false sense of security. That we believe ‘those out there’ will sort it out, whilst we carry on as before. That we can sidestep the actually uncomfortable path – reducing consumption, exerting political pressure, bringing about systemic change – by relying on miraculous technical solutions.
A plea for honesty
What we need is honesty. The Ocean Cleanup should communicate transparently: What is actually being achieved? How much microplastic remains? What are the environmental side-effects? And above all: Is this the most effective use of available resources?
Investors and donors should ask themselves: Am I supporting an effective solution here – or am I simply soothing my conscience with a project that looks good but misses the heart of the problem?
And we should all recognise that the oceans are not saved on the high seas, but on land. Not through spectacular technology alone, but through the sum of many small, unspectacular decisions. Through prevention rather than repair. By tackling the root causes rather than merely alleviating the symptoms.
A silver lining: the river barriers
Interestingly, The Ocean Cleanup has long since ceased to operate solely on the high seas. Since 2019, the organisation has been developing so-called ‘Interceptors’ – floating barriers for rivers that intercept plastic waste before it even reaches the sea. These systems are in use in countries such as Indonesia, Malaysia, Vietnam, the Dominican Republic and Jamaica, tackling the problem right at its source.
The logic is compelling: Why go to the trouble of fishing plastic out of the ocean when you can stop it right there in the river? An Interceptor costs a fraction of the price of open-ocean systems, operates continuously and – when positioned correctly – can intercept enormous quantities of waste. According to the organisation’s own figures, the systems installed to date have already removed over 3,000 tonnes of waste from rivers – significantly more than all open-ocean operations combined.
This is where the organisation’s true potential lies: if the same innovative drive, marketing expertise and financial resources that went into System 03 were invested more heavily in scaling up the river barriers, a real breakthrough could be achieved. For whilst the Pacific missions have symbolic value, hundreds of Interceptors at the right river mouths could actually stop the flow of new waste – and thus, in the long term, allow the garbage patches to dry up.
The question is: will The Ocean Cleanup consistently follow through with this shift? Or will the spectacular open-ocean mission remain the flagship project, whilst the more effective but less photogenic river work remains in the shadows?
Conclusion: Admiration, yes – but please keep a critical eye on things
The Ocean Cleanup deserves respect for its technical achievements and its ability to mobilise people. The development of the river interceptors, in particular, shows that the organisation is learning and adjusting its strategy. These floating barriers in rivers work more efficiently, cost less and tackle the problem at its source – exactly where it needs to be tackled.
Yet whilst the river technology is promising, the key question remains: will The Ocean Cleanup consistently shift its resources and media attention in that direction? Or will the spectacular deep-sea System 03 remain the flagship, whilst the truly effective work in the rivers remains underfunded and overlooked?
The real challenge, however, does not lie solely with one organisation. It lies with the microplastics we cannot see. With the millions of tonnes added each year.
In the systemic causes of a throwaway society, which technical innovation alone cannot solve.
We need less spectacular solutions for one per cent of the problem – and more consistent work on the 99 per cent that remain invisible. Less high-tech on the high seas – and more low-tech at river mouths. Less media attention on clean-up – and more political pressure to prevent pollution.
The Ocean Cleanup, with its river barriers, could indeed be a building block of the solution – if it sets its priorities correctly. As long as we understand this and act accordingly, it has its place. But as soon as we regard it as a complete solution that relieves us of more uncomfortable truths, it becomes part of the problem.
The oceans do not need heroes with high-tech barriers on the high seas. They need humanity to finally realise that the best plastic in the sea is the plastic that never gets there in the first place – and river barriers are a promising start towards achieving precisely that.
See also:
System 03: A Beginner’s Guide
Ocean Cleanup - Intercepting Trahs in Rivers