Editing Marine plastic concentration (section)

== Geographic / System Context ==
Marine plastic concentration is a global phenomenon affecting all ocean basins, from coastal zones to the open ocean, including surface waters, water columns, and seabed sediments. The distribution of plastic debris is influenced by ocean currents, wind patterns, coastal population density, and waste management practices. Regions such as ocean gyres, coastal estuaries, and river mouths often exhibit elevated concentrations due to accumulation and transport mechanisms. The marine environment serves as both a sink and conduit for plastic materials, linking terrestrial and marine ecosystems.