Introduction: The case for scenarios of the environment / Joseph Alcamo -- Towards guidelines for environmental scenario analysis / Joseph Alcamo and Thomas Henrichs -- A survey of environmental scenarios / Dale S. Rothman -- Searching for the future of land: scenarios from the local to global scale / Joseph Alcamo ... [et al.] -- Participation in building environmental scenarios / Claudia Pahl-Wostl -- The SAS approach: combining qualitative and quantitative knowledge in environmental scenarios / Joseph Alcamo -- Scale issues in environmental scenario development / Petra Döll, Gerhard Petschel-Held, and Rik Leemans -- Dealing with surprises in environmental scenarios / Ferenc L. Toth