Resource economist. Currently he is working as a Distinguished Ikerbasque (Basque Foundation for Science) Professor at the Basque Centre for Climate Change (BC3), Leioa (Spain) and Honorary Professor of Economics at the University of Bath (UK). He was a lead author for the 3rd, 4th and 5th IPCC Assessment Reports on climate change as well as the Special Report on Global Warming of 1.5º. He was President of the European Association of Environmental and Resource Economics from 2014–2015.