Preface; 1. How can we study CO2 impacts on trees and forests? J.-Y. Pontailler, C. Barton, D. Durrant and M. Forstreuter; 2. Biochemistry, physiology and biophysics of photosynthesis B. Besford, M. Mousseau and G. Scarascia-Mugnozza; 3. Is dark respiration rate changed? M. Mousseau; 4. Will tree foliage be larger and live longer? M. Murray and R. Ceulemans; 5. Biomass, growth and carbon allocation H. Lee, D. Overdieck and P. Jarvis; 6. Is water used more efficiently? G. Scarascia-Mugnozza and P. de Angelis; 7. Do elevated CO2 concentrations and nutrients interact? S. Linder and M. Murray; 8. Do the effects of temperature and CO2 interact? D. Overdieck, S. Kellomaeki and K. Wang; 9. What can we learn from microcosms? M. Forstreuter; 10. Modelling leaf, tree and forest responses to increasing atmospheric CO2 and temperature A. Friend, S. Kellomaeki and B. Kruijt; 11. Perspectives for future research B. Saugier; Annex I: refereed papers; Annex II: abstracts, notes, reports and thesis; Index.