A topic connecting parts of my Ph.D. We used present vegetation in Southern Siberia as a modern analogue to interpret ecosystems of the last glacial in Central Europe. The analogue hypothesis is based on biogeographical and climatological links. We studied modern pollen spectra related to present vegetation, which we correlated with fossil pollen using several numerical techniques.
Traces of human impact in the environment of Early Holocene is a long time discussed task. Have humans lived without visible interaction with ecosystems or were they intentionally "farming" and spreading plant species? Answer is still unresolved but indices suggest that "Neolithic revolution" was rather continuous than abrupt change.
Read some papers on this topic (more in my publications):