Uncertainties of global biogeochemical predictions / E.-D. Schulze and D.S.S. Schimel -- Uncertainties of global climate predictions / Lennart Bengtsson -- Uncertainties in the atmospheric chemical system / Guy P. Brasseur and Elisabeth A. Holland -- Inferring biogeochemical sources and sinks from atmospheric concentrations : general considerations and applications in vegetation canopies / M.R. Raupach -- Biogeophysical feedbacks and the dynamics of climate / M. Claussen -- Land-ocean-atmosphere interactions and monsoon climate change : a paleo-perspective / John E. Kutzbach, Sandy P. Harrison and Michael T. Coe -- Paleobiogeochemistry / I.C. Prentice and D. Raynaud -- Should phosphorus availability be constraining moist tropical forest responses to increasing CO₂ concentrations? / J. Lloyd, M.I. Bird, E.M. Veenendaal and B. Kruijt -- Trees in grasslands : biogeochemical consequences of woody plant expansion / Steve Archer, Thomas W. Boutton and K.A. Hibbard -- Biogeochemistry in the Arctic : patterns, processes, and controls / S. Jonasson, F.S. Chapin III and G.R. Shaver -- Evaporation in the boreal zone during summer : physics and vegetation / Francis M. Kelliher, Jon Lloyd, Corinna Rebmann, Christian Wirth, Ernst Detlef Schulze and Dennis D. Baldocchi -- Past and future forest response to rapid climate change / Margaret B. Davis -- Biogeochemical models : implicit versus explicit microbiology / Joshua Schimel -- Global soil organic carbon pool / Michael Bird, Hana Santrùcková, John Lloyd and Elmar Veenendaal -- Plant compounds and their turnover and stabilization as soil organic matter / Gerd Gleixner, Claudia J. Czimczik, Christiane Kramer, Barbara Lühker and Michael W.I. Schmidt -- Input/output balances and nitrogen limitation in terrestrial ecosystems / Peter Vitousek and Christopher B. Field -- Interactions between hillslope hydrochemistry, nitrogen dynamics, and plants in Fennoscandian boreal forest / Peter Högberg -- The cycle of atmospheric molecular oxygen and its isotopes / Martin Heimann -- Constraining the global carbon budget from global to regional scales : the measurement challenge / R.J. Francey, P.J. Rayner and C.E. Allison -- Carbon isotope discrimination of terrestrial ecosystems : how well do observed and modeled results match? / Nina Buchmann and Jed O. Kaplan -- Photosynthetic pathways and climate / James R. Ehleringer and Thure E. Cerling -- Biological diversity, evolution, and biogeochemistry / H.A. Mooney -- Atmospheric perspectives on the ocean carbon cycle / Peter J. Rayner -- International instruments for the protection of the world climate and their national implementation / Rüdiger Wolfrum -- A new tool for characterizing and managing risks / Ortwin Renn, Andreas Klinke, Gerald Busch, Friedrich Beese and Gerhard Lammel -- Contrasting approaches : the ozone layer, climate change, and resolving the Kyoto dilemma / Ambassador Richard E. Benedick -- Optimizing long-term climate management / Klaus Hasselmann.