Reducing environmental plastic pollution by designing polymer materials for managed end-of-life

Plastics are a ubiquitous class of synthetic polymer materials used in virtually all commercial and industrial sectors. The majority of global plastics consists of polymers with carbon–carbon backbones, whose environmental persistence and low cost have resulted in a massive reservoir of plastic waste that resides in landfills and the environment. Although plastic debris contaminating the ocean has been documented for decades, details about plastic debris composition, distribution, impact and ultimate fate in the environment remain elusive. In this Review, we present an overview of environmental plastic contamination and discuss the origin (feedstock) and degradation behaviour of plastics to help inform material design principles addressing end-of-life management. We argue that designing materials to be ‘marine biodegradable’ or universally biodegradable is not, in itself, a solution to plastic pollution. Instead, material and product design principles must include a feasible plan for recovery and treatment based upon existing (or, possibly, simultaneously developed) systems.