Climate warm Periods in the Common Era

As far as we know, there were at least two major warm periods lasting up to 600 years in the Common Era.

So is it possible we have entered a new natural warm period after the Little Ice Age? I don't think it can not be entirely dismissed based on current scientific evidence!

 

Some scientists (or perhaps climate deniers) like to dismiss these two known major warm periods as mostly regional phenomena. It is e.g. possible that these warm periods may have affected the northern hemisphere more than the southern hemisphere. Unfortunately, I don't think we have enough evidence to substantiate this claim. How much data do we really have so far e.g. for South America or Africa or Asia?

The Roman Warm Period lasted from about 250 BC to 400 AD. It coincides e.g. with Hanibal crossing the Alps with elephants and the demise of the Roman empire and other events indicating warmer temperatures.

The Medieval Warm Period lasted from about 950 to 1250 CE. It coincides e.g. with the Vikings settling the west coast of Greenland (have you ever wondered with this far northern ice covered island is called green land?). Apparently, there is some evidence that this warm period also reached Japan, equatorial Africa, Pacific islands, the east coast of lower North America and so on.