During 2008-2013 he was a Professorial Research Fellow at the University of Manchester's Sustainable Consumption Institute (SCI). He was also an Andrew D. White Professor-at-Large (2007–2013) at Cornell University and was (2010–2011) President of the " (EAERE)European Association of Environmental and Resource Economists (EAERE)". He is a patron of population concern charity Population Matters (formerly the Optimum Population Trust) (2008–). During 2011-2014 he was Chairman of the Scientific Advisory Board of the International Human Dimensions Programme (IHDP) on Global Environmental Change, Bonn. Since 2011 he has been Chairman of the Advisory Board of the Wittgenstein Centre, Vienna. He served as Chairman of the Central Government Expert Group on Green National Accounting for India which submitted its Report in 2013. He is a cofounder of the Centre for the Study of Existential Risk at the University of Cambridge.