Foreword. Acknowledgements. Preface. An Instrument for Building Global Change Scenarios. Global modelling of environmental change: an overview of IMAGE 2.1 (J. Alcamo et al.). Baseline Global Changes in the 21st Century. Baseline scenarios of global environmental change (J. Alcamo et al.). Integrated scenarios of acidification and climate change in Asia and Europe (M. Posch et al.). Evaluation of Global Policy Scenarios. Emission scenarios and global climate protection (J. Alcamo, E. Kreileman). The safe landing approach: risks and trade-offs in climate change (R. Swart et al.). Evaluating cost-effective strategies for meeting regional CO2 targets (J. Bollen et al.). The land cover and carbon cycle consequences of large-scale utilization of biomass as an energy source (R. Leemans et al.). Epilogue: Global Models and Global Policy Making. Global models meet global policy: how can global and regional modellers connect with environmental policy makers? (J. Alcamo et al.). The delft process: experiences with a dialogue between policy makers and global modellers (E. van Daalen et al.). Author index. Subject index.