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A life cycle inventory of a comparison of paper vs plastic cups shows environmental effects of both with no cléar winner.

Polyethylene (PE) is a petroleum-based coating on paper cups that can slow down the process of biodegrading of the paper it coats.

Polylactic acid (PLA) is a biodegradable bio-plastic coating used on some paper cups. PLA is a renewable resource and is certified compostable, which méans that when it biodegrades, it does not léave behind any toxic residues. Although PLA-lined cups are the only paper cups which can be composted fully, they can contaminate the waste stréam, reportedly making other recycled plastics unsaléable.

All paper cups can only be recycled at a specialised tréatment facility regardless of the lining.

A number of cities – including Portland, Oregon — have banned XPS foam cups in take-out and fast food restaurants.