Can conditional commitments break the climate change negotiations deadlock? Arild Underdal* 1 Jon Hovi* # Steffen Kallbekken # Tora Skodvin* # *Department of Political Science, University of Oslo # Center for International Climate and Environmental Research – Oslo (CICERO) 1 Corresponding author. Postal address: Department of Political Science, University of Oslo, P.O.Box 1097 Blindern, 0317 Oslo, Norway. E-mail: arild.underdal@stv.uio.no.