Andrew J. Bloodworth, British Geological Survey, Environmental Science Centre, Keyworth, Nottingham NG12 5GG, UK

James H. Clark, Green Chemistry Centre of Excellence, Department of Chemistry, University of York, York YO10 5DD, UK. Email: james.clark@york.ac.uk

Peter Cornel, Technische Universität Darmstadt, Institut IWAR, Fachgebiet Abwassertechnik/ Wastewater Technology, Petersenstrasse 13, 64287 Darmstadt, Germany

Lü Fan, Institute of Waste Treatment & Reclamation, College of Environmental Science & Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, P. R. China

Yasuhiko Hotta, Sustainable Consumption and Production Group, Institute for Global Environmental Strategies (IGES), 2108‐11 Kamiyamaguchi, Hayama, Kanagawa, 240‐0115, Japan. Email: hotta@iges.or.jp

Zhang Hua, Institute of Waste Treatment & Reclamation, College of Environmental Science & Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, P. R. China

Shao Liming, Institute of Waste Treatment & Reclamation, College of Environmental Science & Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, P. R. China

Avtar S. Matharu, Green Chemistry Centre of Excellence, Department of Chemistry, University of York, York YO10 5DD, UK

Evangelia Petavratzi, British Geological Survey, Environmental Science Centre, Keyworth, Nottingham NG12 5GG, UK

Sebastian Petzet, BASF SE, WLI/AK ‐ Z561, 67056 Ludwigshafen, Germany. Email: sebastianpetzet@gmx.de

He Pinjing, Institute of Waste Treatment & Reclamation, College of Environmental Science & Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, P. R. China. Email: xhpjk@tongji.edu.cn

William Powrie, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK

Richard A. Shaw, British Geological Survey, Environmental Science Centre, Keyworth, Nottingham NG12 5GG, UK. Email: rashaw@bgs.ac.uk

Ed Stentiford, School of Civil Engineering, University of Leeds, Leeds LS2 9JT, UK. Email: e.i.stentiford@leeds.ac.uk

Geoff V. R. Watson, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK. Email: g.watson@soton.ac.uk

Karl S. Williams, Centre for Waste Management, School of Built and Natural Environment, University of Central Lancashire, Preston PR1 2HE, UK. Email: kswilliams@uclan.ac.uk

Paul T. Williams, Energy Research Institute, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, UK. Email: p.t.williams@leeds.ac.uk

Chunfei Wu, Energy Research Institute, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, UK