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Introductory Chapter: Navigating the Marine Pollution Crisis – From Microplastics to Metal Contamination and Community Resilience
Summary
This introductory chapter frames the global marine pollution crisis, reviewing evidence that approximately 11 million tons of plastic enter oceans annually with microplastics now ubiquitous across all five ocean basins, and situating MP contamination within the broader context of heavy metal pollution and threats to coastal communities.
The scope of marine pollutionThe oceans, covering about 70% of our planet, are essential for life, regulating climate, supporting biodiversity, and providing livelihoods for millions.They are often regarded as the "lungs of the Earth".Yet, the health of the world's oceans is increasingly under threat from a wide range of pollutants, placing ecosystems, economies, and communities at risk.Marine pollution is a multifaceted global issue that encompasses the introduction of harmful substances or energy into the marine environment, resulting in deleterious effects on marine life, human health, and ecosystem services [1].Marine pollution encompasses a range of contaminants, from microplastics to heavy metals like lead, mercury, and cadmium.Recent studies indicate that approximately 11 million tons of plastic enter the oceans annually [2], with microplastics becoming ubiquitous in marine food webs.Microplastics, defined as plastic particles smaller than 5 mm, have infiltrated marine environments, impacting marine life and human health.These tiny particles can be found in the deepest sea trenches and even in Arctic ice [2].Microplastic concentrations across the five principal oceanic basins were reported to range between 0.002 and 62.50 particles per cubic meter, yielding a global mean concentration of approximately 2.76 particles/m 3 [3].Among these, the Atlantic Ocean exhibited the highest average microplastic load at 4.98 particles/m 3 ; and the Southern Ocean recorded the lowest mean value, at 0.04 particles/m 3 [3].The ingestion of microplastics by marine organisms is a widespread phenomenon, affecting a significant number of species, including those of commercial importance.A global synthesis by Barboza et al. [4] reported that microplastics have been recorded in 830 wild fish species, including 606 species of interest to commercial and subsistence fisheries.This further underscores the extensive reach of microplastic contamination in marine ecosystems.The ingestion of these particles can lead to toxicological effects, bioaccumulation and potential biomagnification up the food
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