Global scenario analysis aims to illuminate the character of the current global system, the dynamics driving it forward, and the spectrum of possible future states and pathways. The endeavor is animated by a conviction, it assumes that informed human choice, mediated through governmental policies, civil initiatives and individual decisions, can shape the future in essential ways. While reflecting realistically on the perils for the future, the authors retain the optimism that there are attractive possibilities, as well, for humanity and the environment in the 21st century.