Unsustainable tendencies in the co-evolution of human and natural systems have stimulated a search for new approaches to understanding complex problems of environment and development. Recently, attention has been drawn to the emergence of a new “sustainability science,” and core questions and research strategies have been proposed. A key challenge of sustainability is to examine the range of plausible future pathways of combined social and environmental systems under conditions of uncertainty, surprise, human choice, and complexity. This requires charting new scientific territory and expanding the current global change research agenda. Scenario analysis—including new participatory and problem-oriented approaches—provides a powerful tool for integrating knowledge, scanning the future in an organized way, and internalizing human choice into sustainability science.

Originally published in Global Environmental Change 14 (2004): 137–146.

A letter to the editor in Science discussing a recent article, "Sustainability Science," by Kates et al. The letter argues that sustainability science will need to transcend the determinism and incremental responses to perturbation that still dominate much research on the dynamics of combined socio-ecological systems. It offers participatory scenario development as an approach for systematically addressing many of the core challenges the discipline faces.

Originally published in Science 297 (September 2002): 1994.