We thank Geert-Jan Roelofs for providing the results of the tropospheric ozone simulations. David Parker made available to us the observed temperature record, Ulf Hansson the anthropogenic sulfur emissions, and Martin Heimann the historical record of greenhouse gas concentrations. We gratefully acknowledge the assistance of Monika Esch and Ulrich Schlese, who adapted the model code for the various experiments and supervised the simulations. We thank Olaf Esher and Norbert Noreiks for drawing the figures. This research was supported by the German Government under Contract 07VKV01/1 and by the European Community under Contract ENV4-CT95-0099 (SINDICATE). The model simulations were performed at the German Climate Computer Center in Hamburg (DKRZ).
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