It would seem, despite the extreme denial of most anti-CO2 activists and UN bureaucrats, that the climate has always changed, frequently making dramatic shifts.
Even producing big shifts prior to the major morphing to a greenhouse gas emitting industrial/consumer society.
Despite the immense treasure of climate change empirical and anecdotal evidence of time past compiled by dedicated researchers, scientists are still conducting new research to delineate the scope and breadth of past changes.
This latest research, done by a group of European scientists, focused on the Northern Hemisphere's hydroclimatology responses to temperature change over 12 centuries. Their findings included:
"...report that (1,2) "proxy evidence does not support the tendency in simulations for wet regions to become wetter and dry regions drier in a warmer climate," that (3) their "hydroclimate reconstruction does not support a general unprecedented intensification of the hydrological cycle in the twentieth century, associated with both more extreme wet and dry conditions, as simulated by an ensemble of models," and that (4) "this finding is in line with recent analyses of instrumental data reporting limited evidence for an intensification of wet and dry anomalies under current global warming,"." Nature 532: 10.1038/nature17418.
In summary, their extensive analysis of the hydrological evidence does not comport with the simulated findings of the most advanced CO2-centric climate models available (surprise, surprise).
Clearly, the accompanying graph depicts the never ending condition of natural climate change, providing further proof that human fossil fuel emissions - and Exxon - are not to blame.
Prior articles on historical climate change.