Professor Julian Allwood is Professor of Engineering and the Environment at the University of Cambridge. He worked for 10 years for Alcoa on flat rolling, before academic positions at Imperial College and Cambridge. His research group develops new manufacturing technologies for metals and strategies to mitigate the environmental harms of production. From 2009-13 he held an EPSRC Leadership Fellowship, to explore ‘material efficiency’ as a climate mitigation strategy – delivering material services with less new material. This led to publication in 2012 of the book “Sustainable Materials: with both eyes open” which can be read online at www.withbotheyesopen.com and was listed by Bill Gates as “one of the best six books I read in 2015.” He was elected a Fellow of the Royal Academy of Engineering in 2017.