Global Cooling NOT Warming : Tree Ring Evidence

Why do even have a debate on this with so much evidence pointing to, the global warmers, and when climate change studies have been proven a fraud.

Global Cooling NOT Warming
Tree-rings prove climate was WARMER in Roman and Medieval times than it is now - and world has been cooling for 2,000 years
Study of semi-fossilised trees gives accurate climate reading back to 138BC
World was warmer in Roman and Medieval times than it is now

By Science Reporter
PUBLISHED: 07:22 EST, 11 July 2012
UPDATED: 17:51 EST, 11 July 2012 Comments (410) Share

Read more: http://www.dailymail.co.uk/sciencetech/article-2171973/Tree-ring-study-proves-climate-WARMER-Roman-Medieval-times-modern-industrial-age.html#ixzz20VUXnzcp

Rings in fossilised pine trees have proven that the world was much warmer than previously thought - with measurements dating back to 138BC

How did the Romans grow grapes in northern England? Perhaps because it was warmer than we thought. A study suggests the Britain of 2,000 years ago experienced a lengthy period of hotter summers than today.

German researchers used data from tree rings – a key indicator of past climate – to claim the world has been on a ‘long-term cooling trend’ for two millennia until the global warming of the twentieth century. This cooling was punctuated by a couple of warm spells.

These are the Medieval Warm Period, which is well known, but also a period during the toga-wearing Roman times when temperatures were apparently 1 deg C warmer than now. They say the very warm period during the years 21 to 50AD has been underestimated by climate scientists.

Lead author Professor Dr Jan Esper of Johannes Gutenberg University in Mainz said: ‘We found that previous estimates of historical temperatures during the Roman era and the Middle Ages were too low.

‘This figure we calculated may not seem particularly significant, however it is not negligible when compared to global warming, which up to now has been less than 1 deg C.’

In general the scientists found a slow cooling of 0.6C over 2,000 years, which they attributed to changes in the Earth’s orbit which took it further away from the Sun.

The study is published in Nature Climate Change. It is based on measurements stretching back to 138BC. The finding may force scientists to rethink current theories of the impact of global warming

Professor Esper's group at the Institute of Geography at JGU used tree-ring density measurements from sub-fossil pine trees originating from Finnish Lapland to produce a reconstruction reaching back to 138 BC. In so doing, the researchers have been able for the first time to precisely demonstrate that the long-term trend over the past two millennia has been towards climatic cooling.