Without detracting from the not insignificant power of consumers to pressurise companies to become more eco conscious, the more compelling voices undoubtedly belong to these companies' investors and shareholders. It is encouraging to see that this coalition of investors has recognised the costs to society of issues such as plastic pollution and, beyond that, that they are actually taking positive action in urging companies such as Tesco, PepsiCo and Amazon to phase out single-use plastics and implement re-use systems for packaging.