The ocean plastic crisis amplified by trade: why global governance is always a step behind

When people discuss plastic pollution, what first comes to mind is often straws on beaches, fishing nets entangling sea turtles, and those striking images repeatedly shared on social media. These images convey the crisis but do not explain where it comes from. The real answers may be hidden inside the containers loaded on ocean freighters, in customs declarations, and in the institutional gaps created by a long-standing imbalance between the international trade system and marine ecological protection.

A cross-disciplinary study published in 2025 in *Frontiers in Marine Science* deliberately shifts the focus from simply "how to clean up the ocean" to "why the ocean keeps receiving garbage." The study's conclusions are not surprising, yet they are unsettling enough: international trade—especially the cross-border flow of plastic products and plastic waste—is systematically deepening marine plastic pollution.

An Invisible Pollution Pipeline

Most people see plastics' "production–consumption–disposal" cycle, yet overlook that plastics are also a highly globalized trade commodity. From single plastic packaging and electronic product casings to the so-called "recyclable waste" shipped from developed countries to developing countries, plastics are constantly moving at high speed throughout global value chains. In this process, the economic logic of transnational trade and its environmental costs often run in opposite directions.

The paper's review of the world's major plastic waste exporters shows that the United States, the European Union, China, and Japan sit in the giant exporter camp. Net export data for 2022 from the UN Comtrade database further paints a variegated map of pollution: economies such as Japan (+559.4), Germany (+212.6), and France (+168.4) occupy the net surplus side, while Malaysia (-336.9), Vietnam (-269.1), Indonesia (-160.1), and Turkey (-667.8) are placed on the net deficit side. These positive and negative numbers constitute a special kind of "pollution trade ledger": high-income countries achieve pollution outsourcing through waste exports, while low- and middle-income countries, owing to weaker border enforcement and lower processing costs, are forced to become the final unloading ground for global plastics.

The consequences of this flow are not confined to landfills. Citing research in its literature review, the paper points out that roughly 60% of global marine debris can be traced to international shipping and the plastic waste trade. Containers falling into the sea, leakage during cargo loading and unloading, illegal discharge of shipboard waste, and uncontrolled open-air disposal after import all eventually converge on the same ocean. In other words, plastics entering the ocean is not accidental dumping; it is an infrastructure-like pollution pipeline—whose operating rules are shaped by trade order, and whose endpoint is determined by unequal governance capacity.

Cracks in the Legal Patchwork

Faced with this flowing pollution pipeline, does the international community lack treaties?Faced with this flowing pollution pipeline, does the international community lack treaties? No. The Basel Convention has long incorporated the transboundary movement of plastic waste into the prior informed consent framework; the United Nations Convention on the Law of the Sea (UNCLOS) also imposes on states a general obligation to protect and preserve the marine environment; regional trade agreements frequently include environmental protection chapters.

The problem is that when these legal texts are pieced together, they do not form a complete line of defense. The authors of the paper examined these three layers of legal frameworks one by one and found a common problem: weak enforcement mechanisms and institutional disconnect. The amended Basel Convention brings most mixed plastic waste under regulatory control, but in actual customs operations, exporting countries often use “recyclable materials” as a cover to ship low-value plastic waste into countries with insufficient regulatory capacity. UNCLOS establishes a major framework of principles, yet it has no specific trade rules for plastic waste, nor does it form a truly effective interface with international trade law. Although regional trade agreements contain an increasing amount of environmental discourse, most environmental chapters remain at the level of cooperative intent, lacking binding provisions and dispute settlement mechanisms.

Thus a peculiar governance paradox has emerged on the world stage: the more rules there are, the fewer the gaps that are closed; each treaty asserts sovereignty within its own sphere of jurisdiction, yet all fall silent in cross-domain coordination. It is precisely through these cracks that the undercurrents of international trade flow.

The Priority of Free Trade Overrides Environmental Compacts

Why has international law failed to stop the flow of plastic waste? The structural cause that the research truly points to is the long-standing power asymmetry between the international trade law system and the environmental protection law system.

At the trade negotiating table, provisions restricting exports of plastic products or the movement of waste are often regarded as “disguised trade barriers” and subject to strict review. On the environmental agenda, however, waste plastic is in effect a hazardous waste with global diffusivity, ecological irreversibility, and long-term accumulation. The current international system tends to treat the two separately: trade belongs to trade, environment belongs to environment. At the most critical enforcement juncture, this separation often causes environmental claims to yield to commercial interests.

The issue of “intergenerational equity” mentioned in the paper is pulled back into public view precisely against this background. In the face of marine plastic waste, those who bear the cost are not consumers in plastic-exporting countries, nor the multinational enterprises earning trade surpluses, but coastal communities of developing countries that depend on the ocean for their livelihoods, as well as the next generation that will have to contend with microplastic deposits for decades to come. If international trade carried out today does not take responsibility for pollution, it is essentially overdrawing the natural capital of future generations.

The Old Model Fails, New Rules Are Yet to Be Established

If global plastics management was once a matter of end-of-pipe treatment or recycling efficiency, it must now be acknowledged that it is more fundamentally a problem of governance design for the global supply chain.The paper proposes a clear policy direction: transform environmental provisions from “soft declarations” in trade agreements into “hard constraints.” Specifically, on the one hand, countries should harmonize customs standards for identifying and classifying waste plastics, and establish an information tracking and compliance review mechanism covering the full life cycle of plastics; on the other hand, through collaborative platforms of international organizations, they should strengthen technical assistance and financial support from exporting countries to waste-receiving countries, so as to prevent countries of the Global South with insufficient pollution control capacity from continuing to serve as dumping grounds for waste.

At a deeper level, discussions on a global plastics treaty have already entered the arena of international negotiation, but to truly advance the implementation of plastic pollution governance, the trade system must also change course in tandem. If the old model—exporting waste to lower domestic disposal costs, and importing waste plastics in exchange for short-term economic gains—is losing legitimacy, then the new rules must answer a fundamental premise: whoever produces plastics should bear the full life-cycle costs; whoever profits from trade should also bear responsibility for marine ecology.