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

Studies | Environment | Global Warming

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

Miscellaneous Climate Proxies

Off Greenland’s east coast, on Raffles Ø Island [sic], birds became scarce during the Little Ice Age. In the last 100 years, as the region has warmed, the birds have returned in large numbers. This is confirmed by “an increase in organic matter in the lake sediment and by bird observations.” Based on the chemistry of the sediments, however, the bird numbers are still not as large as they were during the Medieval Warming.84

On Greenland, the University of Michigan’s Henry Fricke tested the tooth enamel of dead Vikings for O-18 to O-16 ratios. Comparing the tooth enamel of skeletons buried in 1100 with those buried in 1400, he documented a 1.5° C drop in temperatures.85

In the Swiss Alps, the three most recent and best-documented periods of landslides (colder and wetter weather) were during the Little Ice Age, the Dark Ages and the unnamed cold period before the Roman Warming.86

In north central England, archeologists have found the nettle groundbug thrived in the city of York in both Roman and Medieval times. Its typical habitat today is on stinging nettles in the much-warmer south of England.87

In Argentina, the remains of prehistoric villages show the native peoples clustered in the lower valleys during the Dark Ages, then moved higher up the slopes as the Medieval Warming brought “a marked increase of environmental suitability, under a relatively homogeneous climate.” Habitation moved as high as 4,300 meters in the Central Peruvian Andes around 1000 with warmer and more stable climate. After 1320 the people migrated back downslope in the colder, less stable climate of the Little Ice Age.

"Movements of animals and peoples are linked to the 1,500-year cycle."

In southern Africa, carbon-dated crop remains prove the climate of the region must have been both warmer and wetter during the Medieval Warming (from about 900 to 1300) — or the millet and cowpeas couldn’t have been grown where their dated remains have been found.88

A recent environmental impact assessment for a gas pipeline reported that the Little Ice Age began about 1300, when colder and drier conditions drove the ancestors of the present day Nguni and Sotho-Tswana speakers from East Africa into South Africa. The climate warmed again between 1425 and 1675.89

The Tibetan Plateau, based on oxygen-18 isotopes from peat bogs, had: three severely cold intervals during the Dark Ages, a warm period from 1100 to 1300, and then cold periods again during 1370 to 1400, 1550 to 1610 and 1780 to 1880.90

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