Tag Archives: Medieval Warm Period

Claim: Solar activity not a key cause of climate change, study shows

From the University of Edinburgh , another one-paper syndrome in the making funded by an NGO research council with a political mission to grab a headline. And, another poorly written press release where they don’t even cite the name of … Continue reading

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Posted in Modeling, Science, Solar | Tagged , , , , , , , | 182 Comments

The truth about ‘We have to get rid of the medieval warm period’

In the thread Intelligence and the hockey stick commenter “Robert” challenged a well known quote about the MWP from 2006 by Dr. David Deming in his statement before the Senate EPW committee which is the title of this post. I thought … Continue reading

Posted in MedievalWarmPeriod | Tagged , , , , , , , | 240 Comments

Intelligence and the hockey stick

Guest essay by Christopher Monckton of Brenchley In 1990, the IPCC’s First Assessment Report showed a schematic demonstrating the then understanding that the medieval warm period had been appreciably warmer than the present and that the Little Ice Age had … Continue reading

Posted in Opinion | Tagged , , , , , , , | 67 Comments

New paper: Arctic temperatures peaked before 1950, declining since

New paper using Oxygen 18 isotope tracking finds the Arctic temperatures peaked before 1950, and have been stable to declining since. Natural variability is cited as the cause. A new paper published in Climate of the Past reconstructs temperatures over … Continue reading

Posted in Arctic, Paleoclimatology | Tagged , , , , , , , | 43 Comments

New paper shows Medieval Warm Period was global in scope

Andrew Revkin writes: Michael Mann can’t be happy about this work. Here’s a chat with two authors of an important new Science paper examining 10,000 years of layered fossil plankton in the western Pacific Ocean. The paper finds that several … Continue reading

Posted in Ocean Heat Content, Oceans, Paleoclimatology | Tagged , , , , , , | 123 Comments

The state of climate science: ‘fluxed up’

Science not settled, still in a state of flux – IPCC AR5 in disarray. It is looking like my single word quote in Rolling Stone “stillborn”, will be accurate. The title is my twist on what Dr. Judith Curry said … Continue reading

Posted in IPCC, IPCC AR5 leak | Tagged , , , , , , , , | 79 Comments

The “Hottest” Temperature Game

Climate Deception: How The “Hottest” Temperature Game Is Played To Offset Prediction Failures Guest essay by Dr. Tim Ball  Global temperature is not doing what the “official” Intergovernmental Panel on Climate Change (IPCC) predicted. Proponents of the claim humans are … Continue reading

Posted in Temperature | Tagged , , , , , , , | 107 Comments

The Medieval Warm Period in the Arctic

Since the IPCC AR5 is again making news in talking about the Medieval Warm Period, this review from Craig Idso at CO2Science.org seems appropriate. -Anthony Medieval Warm Period (Arctic) — Summary This review begins with the study of Dahl-Jensen et … Continue reading

Posted in Arctic, MedievalWarmPeriod | Tagged , | 56 Comments

IPCC throws Mann’s Hockey Stick under the bus?

While the media circulates the talking points pre-release “leaked draft” of IPCC’s AR5 amongst themselves, there are a few nuggets of interest coming out here and there we can write about. One such nugget is contained in a series of … Continue reading

Posted in IPCC, IPCC AR5 leak, Michael E. Mann | Tagged , , , , , , , , | 71 Comments

Remarkable correlation of Arctic sea ice to solar cycle length

This is interesting, especially since Solar Cycle 23 was quite long. The Hockey Schtick writes: A paper published by the Danish Meteorological Institute finds a remarkable correlation of Arctic sea ice observations over the past 500 years to “the solar … Continue reading

Posted in Arctic, Sea ice, Solar | Tagged , , , , , , , | 108 Comments

Hot weather and climate change – a mountain from a molehill?

Guest essay by Steve Goreham Originally published in The Washington Times On Sunday, Death Valley temperatures reached 129oF, a new June record high for the United States, according to the National Weather Service. Temperatures at McCarran International Airport in Las … Continue reading

Posted in Climate data, heat wave, records, Weather, Weather_stations | Tagged , , , , , , | 128 Comments

Can We Actually Even Tell if Humans Are Affecting the Climate? What if we did nothing at all?

Essay by Charlie Martin We know, with great certainty, that the overall average temperature of the Earth has warmed by several degreees in the last 400 years, since the end of the Little Ice Age. Before that was a period … Continue reading

Posted in Climate_change, Science | Tagged , , , , , , , | 61 Comments

“Sorry, a TIME Magazine Cover Did Not Predict a Coming Ice Age”… It was just a TIME article.

Guest Post by David Middleton You can always count in TIME magazine’s Bryan Walsh for a good laugh… Well, I suppose that Mr. Walsh is correct that a 1977 TIME magazine cover did not predict “another ice age.” The prediction … Continue reading

Posted in Alarmism, Humor, media | Tagged , , , , , , , | 101 Comments

Global Warming theory has failed all tests, so alarmists return to the ‘97% consensus’ hoax

 Guest essay by Joseph D’Aleo, CCM, Weatherbell Analytics National Academies of Science defines a scientific theory as “a well-substantiated explanation of the natural world that can incorporate facts, laws, inferences, and tested hypotheses.” Dr Richard Feynman, Cornell Physicist in a … Continue reading

Posted in 97% consensus, Global warming | Tagged , , , , , , , | 145 Comments

Briffa, Yamal, reputational damage, and all that

Keith Briffa has just published a new paper using the Yamal-Urals regional chronology data, something long sought after via FOIA requests. That data was withheld, citing it wasn’t cooked done with yet, and that releasing it would damage the reputation … Continue reading

Posted in Climategate, Paleoclimatology | Tagged , , , , , , , | 91 Comments

Michael Mann says climate models cannot explain the Medieval Warming Period – I say they can’t even explain the present

Ice core data shows CO2 levels changed less than 10 parts per million from 1600-1800 during the MWP. From the Hockey Schtick:  A new paper from Schurer et al (with Mann as co-author) finds that climate “models cannot explain the warm … Continue reading

Posted in IPCC AR5 leak, MedievalWarmPeriod, Michael E. Mann, Modeling | Tagged , , , , , , , | 113 Comments

Evidence for a Global Medieval Warm Period

From CO2Science: Medieval Warm Period (Antarctica) — Summary Was there a Medieval Warm Period somewhere in the world in addition to the area surrounding the North Atlantic Ocean, where its occurrence is uncontested? This question is of utmost importance to … Continue reading

Posted in Antarctic, Little Ice Age, MedievalWarmPeriod | Tagged , , , , , , , | 74 Comments

Validity of Marcott et al. PART II

Validity of Marcott et al. contention that “Global temperatures are warmer than at any time in at least 4,000 years” and “Global temperature….. has risen from near the coldest to the warmest levels of the Holocene within the past century.” … Continue reading

Posted in Marcott et al proxy paper, Paleoclimatology | Tagged , , , , , , | 80 Comments

AGW Proponents Fight Rearguard Action As Political Climate Science Fails

Guest post by Dr. Tim Ball Proponents of the anthropogenic global warming (AGW) hypothesis are cornered. They made a political choice to prove rather than disprove the hypothesis, as the scientific method requires. It failed, as IPCC projections (range of … Continue reading

Posted in Marcott et al proxy paper, Opinion | Tagged , , , , , , , | 64 Comments

Global warming – more complex than we thought

From the University of Hawaii ‑ SOEST, more modeling mania for the future. New research shows complexity of global warming Greenhouse gases versus solar heating Global warming from greenhouse gases affects rainfall patterns in the world differently than that from … Continue reading

Posted in Global warming, Modeling, Rainfall | Tagged , , , , , , , | 133 Comments

The age old battle of the thermostat – the ‘Goredian’ Knot of global temperature

People send me stuff. Reader Kurt writes: I just found your excellent website and have book marked it and will visit it often for updates. One simple question the global warm-mongers have never been able to answer is…

Posted in Global cooling, Global warming, Little Ice Age | Tagged , , , , , , | 202 Comments

More on Mark Hertsgaard’s ridiculous claims – The Goldilocks Crop and the Impending Extinction of Pasta

Guest Post by David Middleton Yesterday, WUWT covered the issue from one angle, and blew Hertsgaard’s riduculous claims out of the water. Today, here’s another independently arrived at conclusion that suggests Hertsgaard’s claims are pure fantasy. It is apparently becoming … Continue reading

Posted in Agriculture, Alarmism | Tagged , , , , , , | 78 Comments

The Atlantic Magazine’s ’5 Charts About Climate Change That Should Have You Very, Very Worried’… Worried about scientific illiteracy.

Guest post by David Middleton I ran into this gem on Real Clear Energy this morning… The article cites terrifying new reports commissioned by the World Bank and the CIA and then launches into a graphical cornucopia of nonsense. The … Continue reading

Posted in Alarmism, Carbon dioxide, Climate Craziness of the Week, Climate FAIL, Climate_change, Current News, Disaster, Drought, Environment, extreme weather, Fun_stuff, Greenland ice sheet, Humor, media, Paleoclimatology, Tabloid Climatology, Wildfires | Tagged , , , , , , | 88 Comments

Speak loudly and carry a busted hockey stick

by Walter Starck (in Quadrant Online) The average temperature for the Earth, or any region or even any specific place is very difficult to determine with any accuracy.  At any given time surface air temperatures around the world range over … Continue reading

Posted in Climate News | Tagged , , , , | 138 Comments

Mann’s hockey stick disappears – and CRU’s Briffa helps make the MWP live again by pointing out bias in the data

Shock, awe. Untruncated and unspliced data used in a new paper from Briffa and Melvin at UEA restores the Medieval Warm Period while at the same time disappears Mann’s hockey stick. Here’s figure 5 that tells the story: Look at … Continue reading

Posted in Climategate, Michael E. Mann, Paleoclimatology | Tagged , , , , , , , | 483 Comments

Yet another paper demonstrates warmer temperatures 1000 years ago and even 2000 years ago.

Yesterday I highlighted the paper The extra-tropical Northern Hemisphere temperature in the last two millennia: reconstructions of low-frequency variability, by B Christiansen of the Danish Meteorological Institute and F C Ljungqvist of Stockholm University which showed that using a multitude … Continue reading

Posted in Paleoclimatology | Tagged , , , , , | 182 Comments

New paper confirms the climate was warmer 1000 years ago

Mike Mann will have a twitfest on Twitter trying to knock this one down. Data from 91 Northern Hemisphere proxies was used to reconstruct temperature. See reconstruction graph (figure 5) below. Via The GWPF: A new paper, looking back at … Continue reading

Posted in Michael E. Mann, Paleoclimatology | Tagged , , , , , | 85 Comments

Want to make a paper more alarming and appealing to coverage? Blame the Romans for climate change

By comparing today’s Nature paper to earlier versions I found just a few months old, it looks like some blame revisionism occurred after early discussions of this paper at NOAA in May 2012. Over at Australian Climate Madness, Simon points … Continue reading

Posted in Alarmism, Methane, Paleoclimatology | Tagged , , , , | 99 Comments

Make your own Michael Mann hockey stick at home

Following yesterday’s first look at emails from the 2 year effort to get NOAA to release emails from FOIA requests, where we learn that some scientists felt ‘Hit on the head with a hockey stick’ and that “The paleodata always got … Continue reading

Posted in Climate data, Paleoclimatology | Tagged , , , , , | 64 Comments

Another paper refutes the Mann made hockey stick – MWP was ≈1°C warmer than current temperatures

This new paper uses a rather unique proxy; high-resolution samples micromilled from archaeological shells of the European limpet, Patella vulgata. Mr. Limpet would be proud. A paper published this week in the journal Palaeogeography, Palaeoclimatology, Palaeoecology finds that the Medieval … Continue reading

Posted in Paleoclimatology | Tagged , , , , , , , | 55 Comments

Linking the ENSO and PDO induced rainfall of the Pacific Northwest to proxy data in tree rings and lake sediments

From Penn State , another Mann paper with proxy sets, and a divergence problem. At least they are talking about the MWP, or as they call it, the Medieval Climate Anomaly which had been erased in previous papers Mann had … Continue reading

Posted in Climate data, Paleoclimatology, PDO | Tagged , , , , , , , , | 147 Comments

HH Lamb–“Climate: Present, Past & Future–Vol 2”–In Review–Part I

Guest post by Paul Homewood (reposted from his blog Not a lot of people know that please visit and  bookmark) Part 1 of a three part series. Hubert Lamb was one of the leading climatologists of his time, indeed described … Continue reading

Posted in Book Review | Tagged , , , , , , , , | 66 Comments

Mann’s ‘hockey stick’ claims of the MWP and LIA being local were refuted years before it was published

Pierre Gosselin at NoTricksZone reports: Geologist Dr. Sebastian Lüning and Prof. Fritz Vahrenholt found a Japanese tree-ring temperature reconstruction from 1995, one that should have been heeded by the IPCC and Michael Mann before they took the world on a 10-year joyride … Continue reading

Posted in IPCC, Michael E. Mann, Paleoclimatology | Tagged , , , , , , , , , , | 82 Comments

The longest, most high resolution, most inconvenient paleoclimate data that hasn’t been published

Read on for a new Josh cartoon. What’s wrong with this image? Well if you are part of The Team (RealClimate and friends), it goes against everything you’ve been publishing. You want the Medieval Warm Period to disappear, and you … Continue reading

Posted in Paleoclimatology | Tagged , , , , , , , , | 158 Comments

The sum of Yamal is greater than its parts

This post will be a sticky top post for a day or two, new stories will appear below this one. Climategate Continues By Andrew Montford & Harold Ambler May 24, 2012 4:00 A.M. in the National Review – reposted here … Continue reading

Posted in The Yamal Deception | Tagged , , , , , , | 223 Comments