The Physical Evidence of Earth's Unstoppable 1,500-Year Climate Cycle

Policy Reports | Energy and Natural Resources | Global Warming

No. 279
Friday, September 30, 2005
by S. Fred Singer & Dennis T. Avery

Mountain Tree Line Elevations

A “major [European] retreat from farming” occurred during the cold Dark Ages when large parts of the continent were allowed to reforest themselves. Then, during the Medieval Warming, farming staged a strong recovery, and both farming and tree lines moved upslope again — until the beginning of the Little Ice Age.67

In Western Siberia, advances in the tree lines during the warming weather of the first half of the 20th century were “part of a long-term reforestation of tundra environments.” Swiss scientists note that “stumps and logs of Larix sibirica can be preserved for hundreds of years,” and that “above the tree line in the Polar Urals such relict material from large, upright trees were sampled and dated, confirming the existence, around A.D. 1000, of a forest tree line 30 meters above the late 20th century limit.” They also note that “this previous forest limit receded around 1350, perhaps caused by a general cooling trend.” Thus, the Siberian tree lines testify to the Medieval Warming and the Little Ice Age far from Europe.68

The southern tip of South America became abnormally dry for several centuries during the Medieval Warming before 1350. It was so dry, in fact, that trees as old as 100 years grew in the beds of Lakes Argentino, Cardiel and Ghio before the lakes reflooded during the heavier rains of the Little Ice Age.69

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