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The Silent Crisis: Marine Plastic Pollution and Its Impact on Marine Biodiversity
Summary
This review paper pulls together existing research showing that plastic pollution in our oceans has exploded since the 1950s, with most of it never getting recycled and instead breaking down into tiny microplastic particles that stick around for decades. These plastics harm marine life through entanglement, ingestion, and chemical exposure to additives like BPA that disrupt hormones and reproduction — and since we eat seafood, these same chemicals and microplastics can end up on our plates, making ocean plastic pollution a human health issue too, not just an environmental one.
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.