¹ Maastricht University, Maastricht, Netherlands, ² University of Michigan, Michigan, United States, ³ Georgetown University, Washington, United States, ⁴ University of Kiel, Kiel, Germany

¹ Middlesex University, Department of Economics, London, United Kingdom, ² Center for Research on Environmental Decisions, Columbia University, New York, United States

University of Bonn, Bonn, Germany

University of Freiburg, Freiburg, Germany