The Medieval Warm Period was marked by a significant increase in average temperatures throughout Europe from around the mid-10th century to around the mid-13th century. This allowed an expansion of cultivation zones for crops such as wheat and grapes farther north within Europe.
This period coincided with massive deforestation and marshland conversion programs in Northern and Western Europe, sometimes called the Great Clearances, which were designed to increase the arable land available (Hoffmann, Richard. An Environmental History of Medieval Europe. Cambridge University Press, 2014, pp. 119-131).
I read a paper suggesting a causal link between the favorable climate changes and the drastic deforestation programs (Berglund, Bjorn. "Human impact and climate changes—synchronous events and a causal link?" Quaternary International 105 (2003): p. 7). It does seem reasonable to suspect that the appearance of newly favorable climates played a role in decisions to expand arable land.
Is there historical evidence supporting such a causal link? If so, were the Great Clearances enacted primarily to take advantage of a shift in suitable cultivation zones?
To clarify, I'm not looking for documentation that deforestation occurred per se because it was warmer. Instead, I expect there might be historical evidence that agricultural expansion programs were specifically enacted in certain regions due to a new recognition that cereal and other crops could grow there when they couldn't grow there before.