Aspects of this topic are discussed in the following places at Britannica.
...appear to have been relatively warm—indeed, perhaps warmer than today in some parts of the world and during certain seasons. For this reason, this interval is sometimes referred to as the Mid-Holocene Climatic Optimum. The relative warmth of average near-surface air temperatures at this time, however, is somewhat unclear. Changes in the pattern of insolation favoured warmer summers at...
in Holocene Epoch: Floral change )...even true for remote areas such as Patagonia and East Africa. Particularly important is the fact that the middle Holocene was appreciably warmer than today. In Europe this phase has been called the Climatic Optimum (zones Boreal to Atlantic), and in North America it has been called the hypsithermal (also altithermal and xerothermic).
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