@misc{lemmen_biogeochemical_cycles_2007, 
author={Lemmen, C.},
title={Biogeochemical Cycles and Climate Dynamics: Global human-nature interactions (in the past)},
year={2007},
howpublished = {lecture: Universitaet Kiel, FB Mathematisch-naturwissenschaftliche Fakultaet;},
note = {Lemmen, C.: Biogeochemical Cycles and Climate Dynamics: Global human-nature interactions (in the past). Universitaet Kiel, FB Mathematisch-naturwissenschaftliche Fakultaet, 2007.}}