Guri Bang, Research Director, CICERO Center for International Climate Research, Oslo. For correspondence: <mailto:guri.bang@cicero.oslo.no>. DOI: 10.21552/cclr/2017/1/11
Tim Rayner, Research Fellow, Tyndall Centre for Climate Change Research, University of East Anglia. For correspondence: <mailto:tim.rayner@uea.ac.uk>. DOI: 10.21552/cclr/2017/1/11