Abstract
This article introduces a special issue of the transactions arising from a Royal Society Discussion Meeting on 'sustainable metals'. Recognizing that progress to date toward the goals of 'sustainability' has been limited, the meeting aimed to open up a new level of interdisciplinary dialogue, collaboration and discussion of disruptive approaches. In this paper, the major concerns of sustainability are enumerated, and climate change is identified as the most urgent. The constraints on deploying technical innovations at scale and speed are discussed, suggesting that much of the required change will require using existing technologies differently, and many opportunities of this type have been overlooked. These constraints also give useful direction for future research and suggest an expanded future role for scientists. Previously, scientists and technologists have aimed largely to 'solve' problems in sustainability through invention. This introductory paper argues that they have an equally important role as participants in the complex societal discussions required to identify pathways to change. Scientific expertise is as important for explaining what cannot be achieved in time or at scale, as it is for promoting the excitement of invention.This article is part of the discussion meeting issue 'Sustainable metals: science and systems'.