Edgar Hertwich is professor in Industrial Ecology at the Norwegian University of Science and Technology and a Fellow at the Yale School of the Environment. He leads the work on resource efficiency and climate change of the International Resource Panel. This work informed the EC's Circular Economy Action Plan and the Renovation Wave, part of its climate policy for the building sector. Hertwich is ranked among the top 100 researchers in the world in the fields of environmental science and climate change, according to separate assessments conducted by researchers at Stanford University and Reuters. Hertwich was a lead author of the energy systems chapter of the Intergovernmental Panel on Climate Change IPCC 5th assessment report.