1. Institute of Earth and Environmental Science University of Potsdam Potsdam Germany
2. Department of Anthropology Smithsonian Institution National Museum of Natural History Washington District of Columbia
3. Institute for the Study of Earth, Oceans, and Space University of New Hampshire Durham New Hampshire
4. Climate and Environmental Physics Physics Institute and Oeschger Centre for Climate Change Research University of Bern Bern Switzerland
5. Institute of Botany and Landscape Ecology, Partner in the Greifswald Mire Center University of Greifswald Greifswald Germany
6. Department of Earth Sciences University of Minnesota Minneapolis Minnesota