I did a fair bit of work on Palaeoecology and Palaeobiogeography with an Australian university, climate change, including faily dramatic change is normal, a static climate for any geologically significant period of time is rare depending on the degree of change considered.
Reasons vary including vulcanism, solar activity, atmospheric gas and variations, bolide impacts, albedo changes, and many other factors.
Magnetic poles move creating magnetic polar wander curves and can change the shape of the Van Allen Belt but geographical pole variation is so very rare.
Plate drift rates vary but two million years is not much in geological time.
Northern Hemisphere climatic variation is higher than the Southern Hemispre due to the proportion of continental surface to ocean.
There are many papers on the Greenland topic you can choose your poison with those.
I will NOT be drawn to comment on anthropogenic climate change models.
In the cultural layers of medieval Gdańsk a signifcant
number of remains of fruits and nuts have been preserved.
Some of the fruit trees could have been cultivated in local
gardens and orchards. Numerous Prunus fruitstones, including P. domestica and P. domestica ssp. insititia, were found
in the 11th and 12th century samples from site 2, while other
sites showed the presence of Malus sp., Pyrus sp., Cerasus
vulgaris and C. avium. Ribes rubrum appeared in the 14th
century. Remains of Vitis vinifera and Ficus carica have
been found in the features dated to the 12th century and
Persica vulgaris to the 12th/13th century transition. It is
difcult to decide whether the grape pips are the remains of
imported raisins (Gade 2018) ***or perhaps of locally grown ***
***grapes used to make the wine needed by the church. The ***
***historical sources tell us that the Cistercians, who settled in *** Oliwa (now part of Gdańsk) in ad 1178 were obliged to grow vines (Badowicz 2017) and then in the 13th and 14th centuries several vineyards **were established in the region, mainly **
**due to the activity of the Teutonic Order (Tandecki 1997). **
**The relatively warm climate in the Baltic region in that ** period made viticulture possible
I remember talking with an agronomist when I was in the UK in the late 90’s and he spoke at length about the shorter and cooler growing season the UK has had since the 15th century and how yield per unit area in some of the same farms used today decreased as a result up until modern practices intervened.