1. Institute of Biological, Rural and Environmental Sciences (IBERS) Aberystwyth University Aberystwyth SY23 3DD UK
2. Center for Permafrost (CENPERM) University of Copenhagen Copenhagen 1350 Denmark
3. Department of Geochemistry Geological Survey of Denmark and Greenland (GEUS) Copenhagen 1350 Denmark
4. School of Geographical and Earth Sciences University of Glasgow Glasgow G12 8QQ UK
5. Department of Biological Sciences University of Bergen Bergen 5006 Norway
6. Department of Ecology, Faculty of Science Charles University Prague 128 44 Czech Republic
7. Department of Environmental Science Aarhus University Roskilde 4000 Denmark