Who is polluting the ocean with plastic?

Current State of Plastic Pollution

• Global plastic waste production is approximately 350 million tonnes annually, projected to nearly triple by 2060.
• An estimated 11 to 14 million tonnes of this waste enters the ocean each year.
• Plastic waste is accumulating in landfills, sewer systems, oceans, and specifically within the five major subtropical gyres.
• Small Island Developing States (SIDS) constitute only 65 million people but suffer disproportionate environmental and economic impacts.

Impact on Small Island Developing States (SIDS)

• SIDS contribute minimally to global mismanaged plastics (Pacific islands produce <1.3%) yet are primary recipients via ocean currents.
• Economic sectors reliant on coastal environments, specifically fishing and tourism, are severely degraded by debris.
• Local biodiversity is declining; fish populations in coral reefs are vanishing as plastic infiltration increases.
• Uninhabited marine protected areas, such as Aldabra Atoll in the Seychelles, receive waste from distant sources including Indonesia, India, and Sri Lanka.

Sources and Transport of Waste

• Plastic reaches SIDS shores primarily through ocean currents rather than local landfills, though local unregulated dumpsites contribute via leakage.
• The Caribbean is identified as one of the highest per capita emitters of plastic into the ocean.
• Industrial fishing gear (ropes, nets, buoys) constitutes the majority of waste by weight on certain SIDS, despite rivers in polluting Asian nations being the dominant global source.
• Ocean simulations by Professor Eric van Sabel confirm that much plastic remains near shores before migrating to gyres or washing back onto islands.

Response and Mitigation Strategies

• Beach Cleanups: Regular removal of plastic prevents wave action and UV exposure from breaking items into microplastics, making coastlines the most effective point for ocean cleanup.
• Legislation: Vanuatu implemented one of the world's strictest single-use plastic bans in 2018 (banning bags, straws, and containers).
  • Post-ban data shows banned items dropped from 25–35% of recorded litter to just 2%.
  • Local economy adapted, with weavers replacing plastic bags with leaf-based alternatives.
• Global Bans: Over 120 countries have enacted bans or taxes on single-use plastics, including India, Canada, and various Pacific and Caribbean nations.
• Recycling Limitations: Globally, only 9% of plastic is recycled, 19% is incinerated, 22% is mismanaged, and 50% ends in landfills.
  • SIDS face specific barriers due to a lack of space, infrastructure, and the high cost of shipping waste for recycling.
  • Current thermal recycling methods allow plastics to be reused only two to three times before degradation.

Technological Innovation

• Research at the University of Portsmouth, led by Professor John McGeehan, focuses on engineering "plastic-eating enzymes."
• These enzymes break plastics down into original component molecules, enabling infinite recycling cycles and "virgin-like" material properties.
• Enzymes are being sourced from high-pollution environments like mangroves and beaches in Southeast Asia (e.g., Singapore, Philippines).
• The long-term goal is to miniaturize these technologies for local community deployment to degrade waste on-site and generate local economic value.

Global Policy and Future Outlook

• A 2022 UN resolution signed by 175 countries commits to establishing a legally binding global plastics treaty by the end of 2024.
• The treaty aims to regulate the entire plastic lifecycle, including production, packaging, design, and disposal.
• Experts warn that without a comprehensive framework, fragmented national approaches will lead to unsustainable pollution levels.
• Success depends on "backward mode" simulations to assign legal liability to specific river sources and fisheries, potentially leading to litigation against polluters.
• While SIDS have led calls for action, richer and larger nations hold the decisive influence on the final treaty's strength and implementation.