Ingemar Renberg,^* Maja-Lena Brännvall,^** Richard Bindler,^*** Ove Emteryd<sup>****


*</sup>Ingemar Renberg is professor in environmental impact assessment at Umeå University. He leads the Environmental Change Assessment group, which studies environmental change, particularly the impact of human activities, using lake sediments and other natural environmental archives. His address: Environmental Change Assessment, Department of Ecology and Environmental Science, Umeå University, SE-901 87 Umeå, Sweden. Ingemar.Renberg@eg.umu.se
^**Maja-Lena Brännvall is a PhD candidate in the Environmental Change Assessment group. Her research interest is the long-term history of atmospheric lead pollution. Her address: Environmental Change Assessment, Department of Ecology and Environmental Science, Umeå University, SE-901 87 Umeå, Sweden. Maja-Lena-Brannvall@eg.umu.se
^***Richard Bindler is a PhD candidate in the Environmental Change Assessment group and has an MSc in Geological Sciences from the University of Maine. His research focuses on the assessment of natural variability and anthropogenic loads of mercury and lead. His address: Environmental Change Assessment, Department of Ecology and Environmental Science, Umeå University, SE-901 87 Umeå, Sweden. Richard.Bindler@eg.umu.se
^****Ove Emteryd is head of the Environmental Research Laboratory, Department of Forest Ecology at the Swedish University of Agricultural Sciences in Umeå. His research interests include isotope analyses and speciation of heavy metals; currently he is involved in a cooperative research project in China. His address: Department of Forest Ecology, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden. Ove.Emteryd@sek.slu.se