Walter R. Stahel will speak on 15 February 2014 at the American Association for the Advancement of Science (AAAS) 2014 conference in Chicago in the session ‘How to make products sustainable while materials become ever more scarce?’ The session is organised by the European Commission, DG Research & Innovation. The title of Stahel’s presentation is ‘Environmental challenges, resource scarcity and the Circular Economy’.