Long be­fore hu­mans dis­covered bio­de­grad­able plastics, mi­croor­gan­isms had already in­ven­ted their own. Many bac­teria and ar­chaea pro­duce nat­ural bioplastics called poly­hy­droxyalkanoates (PHAs), stor­ing them in­side their cells as re­serves of car­bon and en­ergy. Un­til now, sci­ent­...