“…This is a difficult task because a possible peak oil would present a historically unknown challenge. However, different ways of approaching the issue have been proposed in recent years, and they can be grouped along the following lines: (1) econometric approach (Hirsch, 2008, Li, 2008, (2) profit rate analysis (Li, 2007, Exner et al, 2008a, b, Exner, 2013b, (3) economic modeling (Kerschner and Hubacek, 2009, Fleissner, 2010, D'Alessandro et al, 2010, (4) system dynamics (Korowicz, 2010), (5) geopolitical approach (ZfTdB, 2011), (6) historical approach (Friedrichs, 2010). Although these approaches all have their specific assumptions and limitations, and of course do not necessarily converge in their conclusions, we can however draw some general lessons from them.…”