Oct 17, 2008
Solar activity the primary driver of global temperature riseBack
Baghdad|Kiev|Industrial|Water|Asia|Europe|North America|China|France|Greenland|Iceland|Mexico|Norway|Ukraine|United Kingdom|Famines|Valley Of Mexico|Power|Roman Warm|Water|New Mexico|Newfoundland|Central Europe|Eastern Europe|Mediterranean
© Reuse this The period of global warming that we have experienced on our planet over the last century, which has seen a rise in temperature of some 0,6 oC, does not correlate at all with a rise in the concentration of atmospheric carbon dioxide (CO2), but is does correlate with solar activity. Indications are that solar activity is the primary driver of the variation in global temperature.
Further, earlier global warming periods were always accompanied by great human prosperity, and not by gloom and doom, as today's global warming adherents are forever saying. In fact, it was periods of global cooling that were bad for the world's population and for the environment as a whole.
In AD 793, the Vikings burst upon their European neighbours, starting with England. One venture took them into eastern Europe. There, they founded the Russian State at Kiev, in Ukraine, in 882 AD.
They also moved into France, as the Normans, and became a power in the Mediterranean as well as in Europe.
Two centuries of global warming then followed, from about 930 AD. This warm weather assisted the Vikings in taking Iceland from the Irish. The Vikings settled in Greenland and explored as far west as Newfoundland, in North America.
During this period, around 1000 AD, grain grew in northern Norway and grapes in northern England. The signs of warm-weather crops in these settlements puzzled modern archaeologists when they found evidence of these crops in what they thought had always been an iced-over region.
High in the mountains in central Europe, abandoned ancient mines were reopened when the area thawed. In what was thought of as the arid region of New Mexico, Amerindians of the Anasazi ethic group built canyon towns and irrigated crops as the climate warmed and rain became a regular feature of the area.
Rain also soaked the grasslands of Asia during the warm centuries, and nomadic horsemen thrived. This was great for the nomads but not so great for some of the other tribes in the region, who got beaten up by the nomads, who then acquired great mobility over the grasslands covered in food for the horses.
In China, a magnetic compass was invented – the earliest practical compass was described in a Chinese military manual of 1044. It was a magnetised fish shape that floated on water. Compasses soon evolved into magnets hanging on silk threads. The importance of the compass is that it allowed people to confidently sail far away from land in small ships.
Administrative reforms in China, starting in 1068, transformed the Chinese empire into the first economy managed on modern lines, relying on equitable money taxes rather than forced labour. The economy and the population boomed during the warm years, and government loans encouraged farmers to plant a new variety of rice from Indochina.
The Chinese seafarers continued to trade widely across South-East Asia and so spread their knowledge and goods, to the benefit of all.
In the meantime, in Middle America, around 1200, there was turmoil. Aztecs, from the north, entered the Valley of Mexico. They rose to power over their neighbours in about 1320.
It appears the reason why they moved and rose to power was the downturn in the climate, which began in about 1190. "Hey man, chill out" had a different meaning for them. Other sufferers from the cooling climate were the Anasazi, who were then forced, by drought, to abandon their canyon settlements. They moved to concentrate along the Rio Grande.
Starting in 1314, Europe was struck by repeated famines. The mountain mines were abandoned again, and the Vikings were frozen out of their settlements. By 1342, the Vikings' customary route to Greenland had been blocked by ice.
The Eurasian steppes became the scene of terrible military events. When the rainfall diminished from 1160, the numerous horsemen were happy for a warlord to tell them to attack the farming villages.
The break-out of the Mongols and their allies, the Turks, exceeded any previous break-out in ferocity and scope. In 1211, the Chinese Wall was breached. Baghdad, amid its decaying irrigation works, fell in 1258 to the Mongols.
A crash in the population of medieval Eurasia, already evident in China by 1290, was made worse by disease carried by the Mongol supply and trading caravans.
The Black Death first appeared among the Chinese in 1331, killing more than a quarter of them, and in 1346 a Mongol army in southern Russian spread it to Europe.
The Medieval Warm Period was past, and the Little Ice Age was really on its way.
Edited by: Martin Zhuwakinyu© Reuse this Comment Guidelines
Other Dr Kelvin Kemm News
Article contains comments
Updated 2 hours 33 minutes ago President Jacob Zuma announced the composition on Wednesday of the ‘Energy Security Cabinet Sub-Committee’, which he said would oversee the development of South Africa’s future energy mix. Delivering his Budget Vote in the National Assembly, Zuma said the...
Updated 2 hours 34 minutes ago Consulting Engineers South Africa (Cesa) on Wednesday stated that it welcomed government’s move to lead municipalities back to basics and to put in place institutional mechanisms to enable them to deliver core municipal services, as announced by Cooperative...
Updated 2 hours 55 minutes ago JSE-listed construction firm Group Five on Wednesday announced that it expected its fully diluted headline earnings per share (HEPS) for the year ended June 30 to be between 20% and 30% higher, at 382c to 414c, than the fully-diluted HEPS of 318c achieved during the...
Recent Research Reports
Real Economy Year Book 2014 (PDF Report)
This edition drills down into the performance and outlook for a variety of sectors, including automotive, construction, electricity, transport, steel, water, coal, gold, iron-ore and platinum.
Real Economy Insight: Automotive 2014 (PDF Report)
This four-page brief covers key developments in the automotive industry over the past 12 months, including an overview of South Africa’s automotive market, trade figures, production and the policies influencing the sector.
Real Economy Insight: Construction 2014 (PDF Report)
This five-page brief covers key developments in the construction industry over the past 12 months. It provides an overview of the sector and includes details of employment in the sector, infrastructure and municipal spending, as well as insight into companies’...
Real Economy Insight: Electricity 2014 (PDF Report)
This five-page brief covers key developments in the electricity industry over the past 12 months, including details of State-owned power utility Eskom’s generation activities, funding and tariffs, independent power producers and prospects for the sector.
Real Economy Insight: Road and Rail 2014 (PDF Report)
This six-page brief covers key developments in the road and rail industries over the past 12 months, including details of South Africa’s road and rail network and prospects for both sectors.
Real Economy Insight: Steel 2014 (PDF Report)
This four-page brief covers key developments in the steel industry over the past 12 months. It provides an overview of the global and South African steel and stainless steel markets, South Africa’s major steel producers and events that have shaped these markets.
This Week's Magazine
Local aerospace company Denel Aerostructures (DAe), part of the State-owned Denel Group, has won a fourth contract to manufacture parts for the Airbus A400M military air transport and air-to-air refuelling aircraft. The new contract, which was won in an international...
Although CEO Mark McChlery and chief marketing officer Bob Skinstad likened themselves to children in a playground when taking on the task of “reengineering and repositioning” the Seartec brand, the “young, dynamic and enthusiastic guys” were like proud...
An increasing number of buyers, in both the new and used car markets, are opting for finance structures that lower their monthly repayments, says asset financing company WesBank. These include the use of large balloon payments (also known as residuals), as well as...
Tertiary education institutions can use search engine giant Google’s Chromebook to provide secure mobile end-point devices for students on which they can share documents, work collaboratively on documents and access education materials and applications being used...
Local ceiling and partition company Abbeycon has beaten global competition at the Saint-Gobain Gypsum International Trophy competition, which was held last month in Berlin, Germany.