What is the estimated amount of microplastics on the ocean floor globally?

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The Ocean Floor Holds an Estimated 14 Million Tonnes of Microplastics

The planet's seafloor is estimated to be laden with approximately 14 million tonnes of microplastics. Research indicates that these tiny plastic fragments, originating from sources like packaging, synthetic textiles, and fishing gear, have become ubiquitous in all global oceans, extending even to the deepest marine trenches. Scientists are increasingly calling for more in-depth studies to understand their pervasive effects.
Research Efforts Underway to Quantify and Understand Microplastic Presence

A collaborative project involving French and Japanese researchers is actively collecting and analysing samples from Japan's coastal waters. This initiative aims to elucidate the pathways through which microplastics enter the marine environment and how they accumulate on the ocean floor. The study also investigates the "plastisphere," a newly recognised ecosystem where microorganisms colonise discarded plastic debris.
The "Plastisphere" Represents a Novel Microbial Environment

The "plastisphere" is described as a novel ecosystem that emerged only after the 1970s, indicating that the specific types of microbes associated with plastic are not yet fully understood. Researchers are examining the bacteria found on these plastic particles to ascertain if they pose any risks to the broader food chain or could act as vectors for diseases, with the diversity of bacteria offering insights into environmental changes.
Microplastic Pollution Extends Beyond Local Sources

While official reports suggest that Japan has a robust waste management system and a high recycling rate for plastic waste, with much of it incinerated for energy, this does not entirely account for microplastic contamination. Studies indicate that microplastics are present even in remote regions, and a significant portion of plastic waste found in Japanese waters may originate from neighbouring countries, swept in by oceanic currents.

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What is the estimated amount of microplastics on the ocean floor globally?

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