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The Silent Crisis: Marine Plastic Pollution and Its Impact on Marine Biodiversity
Summary
This review pulls together existing research showing that most of the plastic we've ever made has ended up as waste, and much of it breaks down into tiny microplastic particles that stick around in our oceans for decades, harming fish, seabirds, and other marine life through ingestion and toxic chemical exposure. This matters for us too: many of these microplastics and their chemical additives (like BPA) can work their way up the food chain into the seafood we eat, meaning ocean plastic pollution isn't just an environmental issue — it's a growing part of our own chemical exposure.
Plastic pollution has become a serious global threat to marine ecosystems since the rapid expansion of plastic production after World War II. Global plastic production increased from about 1.5–2 million metric tons (MMT) in 1950 to nearly 368 MMT in 2019. By 2017, around 76% of the 8,300 MMT of plastics produced had become waste, while only 9% was recycled effectively. Large plastic debris gradually breaks down into microplastics and nanoplastics, which persist in marine environments for long periods. Plastic pollution originates from both land- and sea-based sources and severely affects marine organisms through entanglement, ingestion, habitat damage, and chemical contamination. Harmful additives such as phthalates, BPA, and persistent organic pollutants can disrupt the reproductive and physiological systems of marine species. Increasing evidence of polluted coastlines and affected marine life highlights the urgent need for improved waste management, sustainable alternatives, and global efforts to reduce plastic pollution and protect marine biodiversity.