About the only practical way ...
Published by Hartej Baksh Singh, Managing Partner at Quintillion Business Solutions LLP
About the only practical way is physical collection, whether from the beaches or from the sea. This in conjunction with good signage, easy availability of bins, and fines for littering.
The advantages of having beaches on clean seas need not be spelled out. Clean seas are also environmentally positive, and promote healthy marine life.
Most of the trash is usually plastic. Costs can be recovered by having small plastic to diesel plants, for processing the waste plastic, and using the char for black topping of roads. Char reportedly has a 30-year life, so this takes care of another recurring expenditure item, for upkeep of roads.