His research focuses on understanding uncertainty in past and future climate change, with major emphases on sea-level change and on the interactions between physical climate change and the economy. He is a lead author of Economic Risks of Climate Change: An American Prospectus and served as lead scientist for the technical analysis underlying the Risky Business Project. He was also a contributing author to the Intergovernmental Panel on Climate Change’s Fifth Assessment Report. Read a Q&A with Kopp on how the next president should address climate change here.