Global Warming? Global Cooling? Who knows...
- 2010/01/31 01:33:34
- Read all 37 opinions
The only thing the scientists know for sure: IT WILL GET COOLER, THEN IT WILL GET WARMER, THEN IT WILL GET COOLER AGAIN, THEN IT WILL GET WARMER AGAIN, ....
The Holocene Climate Optimum was a warm period during roughly the interval 9,000 to 5,000 years B.P.
The Holocene Climate Optimum warm event consisted of increases of up to 4 °C near the North Pole (in one study, winter warming of 3 to 9 °C and summer of 2 to 6 °C in northern central Siberia).
This warm period was followed by a gradual decline until about 2,000 years ago.
The extreme weather events of 535–536 were the most severe and protracted short-term episodes of cooling in the Northern Hemisphere in the last 2,000 years
The Medieval Warm Period (MWP) or Medieval Climate Optimum was a time of warm climate in the North Atlantic region, lasting from about AD 800–1300. It was followed by a cooler period in the North Atlantic termed the Little Ice Age.
Global temperature records taken from ice cores, tree rings, and lake deposits, have shown that, taken globally, the Earth may have been slightly cooler (by 0.03 degrees Celsius) during the 'Medieval Warm Period' than in the early- and mid-20th century
The Little Ice Age (LIA) was a period of cooling that occurred after a warmer era known as the Medieval Warm Period.
Some confine the Little Ice Age to approximately the 16th century to the mid-19th century. It is generally agreed that there were three minima, beginning about 1650, about 1770, and 1850, each separated by intervals of slight warming
Evidence from mountain glaciers does suggest increased glaciation in a number of widely spread regions outside Europe prior to the 20th century, including Alaska, New Zealand and Patagonia. However, the timing of maximum glacial advances in these regions differs considerably, suggesting that they may represent largely independent regional climate changes, not a globally-synchronous increased glaciation. Thus current evidence does not support globally synchronous periods of anomalous cold or warmth over this timeframe, and the conventional terms of "Little Ice Age" and "Medieval Warm Period" appear to have limited utility in describing trends in hemispheric or global mean temperature changes in past centuries.
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