Let me first use this opportunity to congratulate Detlef Schulze, Colin Prentice, David Schimel, and their co-workers on the determination and speed they have demonstrated in putting the Institute of Biogeochemistry in Jena on the scientific map. As chairman of the MPG planning committee for this institute, I put my heart into this venture and I am very grateful to the MPG, which managed to find ways to support its establishment. The author acknowledges Dr. Erich Roeckner and Mr. Bernard Reichert, who were most helpful in providing part of the material used in this study. Ms. Kornelia Miiller, Ms. Karin Niedl, and Mr. Norbert Noreiks kindly assisted with text and graphics.


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