‘More than 700 scientists from 400 institutions in 40 countries have contributed peer-reviewed papers providing evidence that the Medieval Warm Period was real, global, & warmer than the present’


By: - Climate DepotMarch 8, 2013 8:50 AM

Global warming activists and media outlets are hyping a new study published in Science that claims the Earth is experiencing unprecendted temperatures. See: New York Times: Global Temperatures Highest in 4,000 Years & Associated Press: HEAT SPIKE UNLIKE ANYTHING IN 11,000 YEARS

But the new study is counter to a preponderance of existing peer-reviewed studies showing the Medeiveal Warm Period and the Roman Warming were both as warm or warmer than today without benefit of modern emissions or SUVs.

Penn State Professor Michael Mann has made similar claims of modern temperatires being the warmest, but such “Hockey Stick” temperature claims have been demolished in the scientific literature.

The latest research clearly reveals that the Medieval Warm Period (used to be referred to as the Medieval Climate Optimum) has been verified and was in fact global, not just confined to the Northern Hemisphere.

The Center for the Study of Carbon Dioxide and Global Change reported in 2009 that the “Medieval Warm Period was: (1) global in extent, (2) at least as warm as, but likely even warmer than, the Current Warm Period, and (3) of a duration significantly longer than that of the Current Warm Period to date.”

In addition, The Science and Public Policy Institute reported in May 2009: “More than 700 scientists from 400 institutions in 40 countries have contributed peer-reviewed papers providing evidence that the Medieval Warm Period (MWP) was real, global, and warmer than the present. And the numbers grow larger daily.”

Climate Depot has assembled a small sampling of peer-reviewed studies, data and analyses that refute Michael Mann’s Hockey Stick temperature claims of unprecedented 20th century warmth.

See: Evidence of Prior Unprecedented Global Warming Discovered In Scotland, Medieval Period Low CO2 Levels Likely At Fault

Medieval Warm Period found in 120 proxies. Plus Roman era was similar to early 20th Century – ‘Climate models cannot explain what caused warming 1000 years ago, nor cooling 300 years ago, so they can’t rule out the same factors aren’t changing the climate today (though they claim they can). If climate models can’t explain the past, they can’t predict the future’

Danish Meteorological Institute Scientist Issues Another takedown of UN & Michael Mann’s ‘Hockey Stick’ – ‘We cannot from these reconstructions conclude that the previous 50-year period has been unique in the context of the last 500-1000 years’

Paper finds Medieval Warm Period in Arctic was much warmer than the present – ‘A paper published in Polar Research finds that temps at two sites in Arctic were much warmer than at the end of 20th century. At one site, Longyearbyen, the11-year running-mean peak winter temperature was a remarkable 9C warmer than at the end of the record in 2000. At the 2nd site, Vardo, the11-year running-mean peak winter temperature was about 3.3C warmer than at the end of the record in 2000′

New paper finds Medieval Warming Period was ~1°C warmer than current – ‘A new paper published in Palaeogeography, Palaeoclimatology, Palaeoecology finds that the Medieval Warming Period ‘was warmer than the late 20th century by ~1°C.’

Paper finds Medieval Warm Period in Arctic was much warmer than the present – ‘A paper published in Polar Research finds that temps at two sites in Arctic were much warmer than at the end of 20th century. At one site, Longyearbyen, the11-year running-mean peak winter temperature was a remarkable 9C warmer than at the end of the record in 2000. At the 2nd site, Vardo, the11-year running-mean peak winter temperature was about 3.3C warmer than at the end of the record in 2000′

Earth was warmer in Roman and Medieval Times say German researchers – ‘While CBS touts a ‘groundbreaking’ government report linking extreme weather and climate change, German researchers find 2,000 years of cooling and warmer temps in medieval times and the Roman era’

UK Daily Mail: Tree-ring study proves that climate was WARMER in Roman and Medieval times than it is in the modern industrial age – ‘Rings in fossilised pine trees have proven that the world was much warmer than previously thought -with measurements dating back to 138BC – Tree-rings prove climate was WARMER in Roman and Medieval times than it is now -and world has been cooling for 2,000 years’

New Study reveals ‘trees make a Hockey Stick snap’

Evidence of Prior Unprecedented Global Warming Discovered In Scotland, Medieval Period Low CO2 Levels Likely At Fault

New Peer-Reviewed Study: Climate was HOTTER in Roman, medieval times than now — UN IPCC has got it all wrong, say scientists – Published in hefty climate journal Nature Climate Change, the cooling effect of orbital shifting on the climate has been up to four times as powerful as anthropogenic (human-caused) warming pressures’

Medieval Warming Exceeds Modern Warming, Per New Research Using 120 Proxies – ‘Those inconvenient global warming science facts that climate doomsday pundits hate – another major study determines Medieval Warming hotter than Modern Warming’

New EU Study Confirms Modern ‘Unprecedented’ – ‘Warming Is a Bogus Claim New research documents that the Roman and Medieval Periods were warmer than the modern era across Northern Europe, plus establishes that a slight cooling trend exists – the inconvenient global warming science facts’

New Paper Shows European Alps Were Just As Warm 900 Years Ago, Strong Natural Variations –Another peer-reviewed paper,another smashed hockey stick – ‘The results show that summer temperatures of the last millennium are characterized by two warm periods (AD 1053–1171 and 1823–1996) and two cold phases (AD 1172–1379 and 1573–1822)…’Highest pre-industrial summer temperatures of the 12th century were 0.3 °C warmer than the 20th century mean but 0.35 °C colder than proxy derived temperatures at the end of the 20th century’

Another hockey stick snaps! Southern Hemisphere Hockey Stick Goes Belly Up: ‘ The journal has been contacted and the publication of the study has been put on hold’

‘…unfortunate data processing issue, it is likely to have implications for the results reported in the study…The problems with the paper in a nutshell: 1.upside down proxy data again 2.preselection of data, ignoring the whole set in many cases 3.though they tried to justify preselection, the paper’s methodology doesn’t hold up (circular reasoning) 4.inability to replicate given the data and methods used’

Medieval Warm Period & Little Ice Age Show Up In S. America Too: ‘Yet another new study adds more to growing mountain of evidence that Medieval Warm Period was indeed a global phenomenon’ – The authors did an analysis of pollen and charcoal from Laguna San Pedro,a small closed-basin lake located in the Andes of Chile’

UN IPCC Claim: ‘New paleo records from Australasia provide evidence of MCA warming around 1250–1330′ – Not only are the ‘new’ Gergis proxies not new; they were prominently displayed in the AR4 section on SH proxies

Law Dome in Mann et al 2008

Antarctica Global Warming: Advanced Science Methods Establish That Medieval Period Was Warmer – ‘With constant frigid temperatures, the idea of modern Antarctica ‘global warming’ that is ‘unprecedented’ seems rather ludicrous -indeed it is ludicrous, as latest research again confirms Medieval Warming Period was hotter’

New paper confirms Little Ice Age was a global phenomenon, related to solar activity – Paper published in Geophysical Research Letters confirms that ‘the Little Ice Age was a global event, probably caused by a change in solar [activity] and volcanic forcing [activity], and was not simply a seesaw-type redistribution of heat between the hemispheres as would be predicted by some ocean-circulation hypotheses’

New Paper: Earth heated up in Medieval times without human CO2 emissions — ‘Warming was global and NOT limited to Europe’ – ‘Study throws doubt on orthodoxies around ‘global warming’ — It then cooled down naturally & there was even a ‘mini ice age’. A team of scientists led by geochemist Zunli Lu from Syracuse U. in NY state, has found that contrary to the ‘consensus’, the ‘Medieval Warm Period’ wasn’t just confined to Europe…it extended all the way down to Antarctica –which means that Earth has already experience global warming without aid of human CO2 emissions’

Michael Mann’s Hockey Stick Takes Another Huge Hit: South America’s Hot Medieval Temperatures – New research determines that South America did experience the Medieval Warming and temperatures were higher during MWP, contrary to Michael Mann’s hockey stick “science

Chinese Study Confirms MWP and LIA: ‘During the last 2000 years there have been swings in temperatures of between 2C and 3C’ – ‘Colder intervals occurred around 100 BC, 400 AD, 1200 AD and 1700 AD. — ‘Warmer intervals occurred around 200 AD and 900 AD’ — ‘The 20thC warming is of a smaller magnitude than the MWP’

Deja Vu ’72? ‘Dr. Lamb was also the source of the paleoclimate graph used in the 1990 & 1995 IPCC reports which shows an inconvenient hotter Medieval Warming Period than the present’ – ‘The following IPCC report threw away Dr. Lamb’s graph in favor of Michael Mann’s hockey stick graph, which served to eliminate the Medieval Warming Period. This was the purpose of Mann’s hockey stick, as stated in the climategate emails, to eliminate or “contain the MWP” according to Mann’

German 2000-Year Peat Bog Temperature Reconstruction Shows Strong Central European Variations – ‘Yet another temperature reconstruction out there showing once again Michael Mann was wrong’

German Peat Bog Study Verifies Extreme Warm Temperatures of Medieval Period – Modern Warming Less

Peer Reviewed Study Establishes Unprecedented Medieval Warming On Tropical Island In Southern Hemisphere

New paper finds temperatures and precipitation were higher 1000 years ago – ‘The paper finds higher temps & precipitation were present during Medieval Warming Period (960-1100 AD) than at the end of 20th century. This paper adds to published work of 986 scientists who have documented that Medieval Warming Period was as hot or hotter than present and was a global phenomenon. This study also shows both the rate and magnitude of the rise in temps from the year ~ 700-880 AD was much greater than over a comparable period including 20th century’

Chinese Research Discovers There Was Historical ‘Unprecedented Warming’ Before There Was Modern ‘Unprecedented Warming’

Unprecedented Warming Strikes New York, Prior To Modern CO2 Levels: New Study Finds Medieval Period Warmer

New Research From Alaska Determines That Modern Global Warming Is Well Below Past Warming Periods

Study: ‘Evidence from 180 proxy records of widespread N. Hemisphere warmth in 9th to 11th centuries…indicates that warmth in 10th & 11th centuries was as uniform as current 20th century warming’

Watch Now: Geologist Dr. Don Easterbrook slaps down Michael Mann: There are ’1900 papers in the geologic record’ about the Medieval Warm Period and the Little Ice Age

New Northern Hemisphere Research: 30 Datasets Prove Roman/Medieval Warmings Hotter Than Current Temps

Temp Reconstruction Clearly Shows Medieval Warm Period (MWP) and Little Ice Age: Roman Warm Period and MWP ‘were both warmer than 1961-1990′

New Swiss Evidence Proves Modern Warming Cooler Than Medieval Warming Period, Study Finds

Peer-Reviewed Cherry Blossom Reseach Confirms Japan’s Medieval Climate Warmer Than Current One

‘The Case for a Global Medieval Warm Period Grows Ever Stronger’

Chinese Peer-Reveiwed Study Provides Overwhelming Evidence That UN IPCC Is Wrong: Medieval Warming Was Hotter – ‘More research from China confirms Medieval temperatures were significantly warmer than current ones. The study also provides direct evidence that the Medieval Warming was a global phenomenon, not just a European regional climate condition, as the IPCC speculates.’

New Russian Research: River Floodplains Provide Conclusive Evidence That Medieval Warming Greater Than Modern Warming

The California Medieval Warming Remains Unprecedented: 3.0°C Hotter Than Modern Global Warming

Newest Research Confirms Greenland Region Roasted With Medieval Winter/Summer Temps 3°C Hotter Than Modern Era

What Does Ural Mountains’ Tree Line Say About Modern Warming? Definitely Not As Robust As Medieval Warming

New Chinese study in GRL disputes the hockey stick conclusions: ‘New peer reviewed study illustrates that current warm period is neither unique nor unprecedented’

Peer-Reviewed Research: Unprecedented Global Warming During Medieval Period, Boreholes Reveal

China’s 2,000 Year Temperature History: Declaring anthropogenic emissions have pushed modern temps beyond historical counterparts disregards lessons of 2,000 years of Chinese temps’

Medieval warming WAS global – new science contradicts UN IPCC: ‘More peer-reviewed science contradicting the warming-alarmist ‘scientific consensus’ was announced’ – ‘A new study shows that the well-documented warm period which took place in medieval times was not limited to Europe, or the N. hemisphere: it reached all the way to Antarctica…In other words, global warming has already occurred in historical, pre-industrial times, and then gone away again. Lu et al’s work is published in the peer-reviewed journal Earth and Planetary Science Letters’

See: Climate Depot’s FactSheet on Mann’s Various ‘Hockey Stick’ Creations — The ‘most discredited study in history of Science’

Mann at it again! ‘Very erroneous conclusions’- Michael Mann’s newest invention! The Hurricane ‘Hockey Stick!’ – Climate Depot’s FactSheet on Mann’s Various ‘Hockey Stick’ Creations

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