Not at all. It’s a regular cyclic phenomenon on planet Earth.
Global warming has happened many times before in human history. We’ve had the Minoan Warm Period, the Roman Climate Optimum, and the Medieval Warm Period in addition to the current warm period (Dansguard et al., 1968; Schönwiese, 1995; Keigwin, 1996).
Huang et al. (1997) determined that the depiction of the Medieval Warm Period in this graph may be somewhat conservative. According to their study of 6000 boreholes worldwide, the global mean temperatures of the Medieval Warm Period dwarf the changes of the Twentieth Century.
The evidence shows repeatedly that global warming is a regular cyclic phenomenon on planet Earth. In fact, the normal global mean temperature for planet earth given the Phanerozoic history, is actually 19.5 degrees Celcius; a full three degrees higher than the present mean.
Thanks to F. Guimaraes for this link