W. Neil Adger is Professor of Environmental Economics in the School of Environmental Sciences at the University of East Anglia, Norwich, UK. He has led the programme on adaptation in the Tyndall Centre for Climate Change Research at the University of East Anglia since its inception in 2000. He served as a Lead Author in the Millennium Ecosystem Assessment and as a Convening Lead Author for the Fourth Assessment Report of the Intergovernmental Panel of Climate Change. He is a co-recipient as a member of the IPCC of the Nobel Peace Prize 2007. He was awarded a Philip Leverhulme Prize from the Leverhulme Trust in 2001 for his research achievements. Irene Lorenzoni is Lecturer in Environmental Politics and Governance at the School of Environmental Sciences at the University of East Anglia, Norwich, UK. Her interest is in the understanding of, and engagement with, climate change and energy. She is deputy leader of the adaptation programme of the Tyndall Centre for Climate Change Research, and a contributing author for the Fourth Assessment Report of the IPCC on barriers to adaptation, which was co-awarded the Nobel Peace Prize in 2007. Karen L. O'Brien is a Professor in the Department of Sociology and Human Geography at the University of Oslo, Norway and Scientific Chair of the Global Environmental Change and Human Security (GECHS) project of the International Human Dimensions Programme on Global Environmental Change (IHDP). Her current research focuses on climate change adaptation as a social process, and on the role that values and worldviews play in responding to environmental change. She was a lead author on the Fourth Assessment Report of the IPCC.