Tag Archives: Holocene

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

About these ads
Posted in MedievalWarmPeriod | Tagged , , , , , , , | 240 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

Global Warming = Climate Change

Guest Essay by Ed Hoskins This short essay questions the actions to combat Global Warming / Climate Change from three points of view: The Temperature Context Man-made CO2 emissions 1965 -2012. The Significance and Influence of Carbon Dioxide CO2 The … Continue reading

Posted in Climate_change, Global warming | Tagged , , , , , , , | 84 Comments

Those who don’t learn from Yamal, are condemned to repeat it – Marcott’s YAD061

You’d think academics in the upside down Mann climate proxy world would pay attention, and not repeat the same mistakes of the past. Apparently not. WUWT readers surely recall the Yamal YAD06 (The most influential tree in the world) and … Continue reading

Posted in Marcott et al proxy paper | Tagged , , , , , , | 73 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

Marcott issues a FAQ on their paper

This is from Real Climate, who played the “he who must not be named” game again in not pointing out criticisms. Gavin dissapoints. UPDATE: McIntyre responded earlier today with The Marcott Filibuster Marcott et al have posted their long-promised FAQ at … Continue reading

Posted in Marcott et al proxy paper | Tagged , | 60 Comments

Where’s the hockey stick? The ‘Marcott 9′ show no warming past 1950

More on the Marcott et al “hockey stick”. All of the ‘Marcott 9′ had altered dates. Guest post by John Kehr While it took me a while to get the time together to write an article about the Marcott paper, … Continue reading

Posted in Marcott et al proxy paper, Paleoclimatology | Tagged , , , | 120 Comments

Marcott’s uptick – a result of proxy sign inconsistency

Shades of upside down Tiljander. McIntyre is delving further into the Marcott proxy issue and it looks almost certain now there’s a statistical processing error (selection bias). Steve McIntyre writes: In the graphic below, I’ve plotted Marcott’s NHX reconstruction against … Continue reading

Posted in Marcott et al proxy paper, Paleoclimatology | Tagged , , , | 56 Comments

Tick, tick, tick – how long will the new Marcott et al hockey stick survive?

Steve McIntyre writes of the curious uptick in the 20th century, which doesn’t seem to be rooted in reality, or to have been in Marcott’s PhD thesis: While one expects a difference between NHX and SHX in the Holocene, the … Continue reading

Posted in Marcott et al proxy paper, Paleoclimatology | Tagged , , , , | 53 Comments

Another Hockey Stick?

Guest post by S. Fred Singer Green forces, eager to promote their theories of global warming, appear to be practicing intellectual recycling.  Is this the return of the notorious hockeystick – which, in 2001, was the central dogma of Anthropogenic … Continue reading

Posted in Marcott et al proxy paper | Tagged , , | 37 Comments

Marcott’s proxies – 10% fail their own criteria for inclusion

Note: Steve McIntyre is also quite baffled by the Marcott et al paper, finding it currently unreproducible given the current information available. I’ve added some comments from him at the bottom of this post – Anthony Guest Post by Willis … Continue reading

Posted in Proxies | Tagged , , , , , , | 128 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

A Simple Test of Marcott et al., 2013

Guest Post by David Middleton The Gorebots are all atwitter about this new paper… Science 8 March 2013: Vol. 339 no. 6124 pp. 1198-1201 DOI: 10.1126/science.1228026 A Reconstruction of Regional and Global Temperature for the Past 11,300 Years Shaun A. … Continue reading

Posted in Alarmism, Marcott et al proxy paper, Michael E. Mann, Paleoclimatology | Tagged , , | 91 Comments

Validity of “A Reconstruction of Regional and Global Temperature for the Past 11,300 Years”

It seems that Marcott et al isn’t all that it is cracked up to be. Dr. Easterbrook takes a good hard look at the paper. Guest post by Dr. Don J. Easterbrook (Note: Because of the far-reaching implications of the … Continue reading

Posted in Marcott et al proxy paper, Paleoclimatology | Tagged , , , | 97 Comments

Marcott et al claim of ‘unprecedented’ warming compared to GISP ice core data

The very first sentence of the Marcott et al (which is getting heavy press) abstract says: Surface temperature reconstructions of the past 1500 years suggest that recent warming is unprecedented in that time. Okay, let’s have a look at the … Continue reading

Posted in Marcott et al proxy paper, Paleoclimatology | Tagged , , , , | 116 Comments

New study: Ocean-driven warming along the western Antarctic Peninsula needs to be considered as part of a natural centennial timescale cycle of climate variability

From Cardiff University: Tiny fossils hold answers to big questions on climate change Research explores 12,000 year fossil record The western Antarctic Peninsula is one of the fastest warming regions on the planet, and the fastest warming part of the … Continue reading

Posted in Antarctic, ENSO | Tagged , , , , , , , | 23 Comments

Now if we could only get them to stop using the “D” word, they might actually communicate better

From the University of Missouri: Public Acceptance of Climate Change Affected by Word Usage, Says MU Anthropologist Better science communication could lead to a more informed American public. Public acceptance of climate change’s reality may have been influenced by the … Continue reading

Posted in Climate News | Tagged , , , , , , , | 100 Comments

New paper demonstrates that climate responds to short and long-term changes in solar activity

(Via the Hockey Schtick) A new peer reviewed paper published in The Holocene finds a significant link between solar activity and climate over the past 1000 years. According to the authors: “Our results suggest that the climate responds to both … Continue reading

Posted in Solar | Tagged , , , | 143 Comments

On certainty: Truth is the Daughter of Time

This comment from Dr. Robert Brown at Duke University is elevated from a comment to a full post for further discussion. Since we have a new paper (Shepherd et al) that is being touted in the media as “certain” using … Continue reading

Posted in Climate data, Uncertainty | Tagged , , , , , , , | 191 Comments

Claim: Five climate-forcing mechanisms govern 20,000 years of climate change

FOREWORD: I don’t agree with many of the claims made in this paper, particularly the retrograde tri-synodic Jupiter/Saturn cycle claims. This is not a peer reviewed paper. That said, I’m willing to allow discussion of it, so be skeptical of these … Continue reading

Posted in Cosmic rays, Modeling, Paleoclimatology, Solar | Tagged , , , , | 347 Comments

Can we predict the duration of an interglacial?

Perspective by William McClenney on the paper of the same title by: P. C. Tzedakis, E.W. Wolff, L. C. Skinner, V. Brovkin, D. A. Hodell, J. F. McManus, and D. Raynaud http://www.clim-past.net/8/1473/2012/cp-8-1473-2012.pdf I can often be heard, when assailed by … Continue reading

Posted in Glaciers | Tagged , , , , | 74 Comments

Onset of the Next Glaciation

Guest post by David Archibald Baby boomers like me have enjoyed the most benign period in human history. The superpower nuclear standoff gave us fifty years of relative peace, we had cheap energy from inherent over-supply of oil, grain supply … Continue reading

Posted in Glaciers, Global cooling | Tagged , , , | 335 Comments

F10.7 Flux, Sea Level and the Holocene

Guest post by David Archibald George Orwell said,” He who controls the present, controls the past. He who controls the past, controls the future.” Some amongst us have used that as an instruction manual and have attempted to create confusion … Continue reading

Posted in Sea level, Solar | Tagged , , | 163 Comments

Paper demonstrates solar activity was at a grand maximum in the late 20th century

Solar activity measured by isotope proxies revealed the end of 20th century was the highest activity in 1200 years A 2010 paper (that I somehow missed) was recently highlighted by the blog The Hockey Schtick and I thought it worth … Continue reading

Posted in Solar | Tagged , , , , , | 99 Comments

Wild Speculation on Climate and Polar Bears

By Dr. Pat Michaels at World Climate Report, reposted with permission. Here is another big one from PNAS. For those who don’t know, PNAS stands for the Proceedings of the National Academy of Sciences and it has gained the unfortunate … Continue reading

Posted in Ridiculae | Tagged , , , , , , , , | 104 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

A response to Dr. Paul Bain’s use of ‘denier’ in the scientific literature

Note: This will be the top post for a day or two, new posts will appear below this one. Readers may recall my original post, Nature’s ugly decision: ‘Deniers’ enters the scientific literature. followed by  Dr. Paul Bain Responds to … Continue reading

Posted in Climate ugliness | Tagged , , , , , , , | 747 Comments

Study shows the Arctic was much colder while Earth was warmer during Eemian warm period

Warm Climate – Cold Arctic? The Eemian is a poor analogue for current climate change 12.06.2012/Kiel. The Eemian interglacial period that began some 125,000 years ago is often used as a model for contemporary climate change. In the international journal … Continue reading

Posted in Arctic, Paleoclimatology | Tagged , , , , , , , | 46 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

Mann’s secret hot sauce

Steve McIntyre finds yet another instance where Mann applies his special “secret hot sauce” to data, selling the sizzle, rather than the steak. It is another familiar tale of data holdback, gatekeeping, obfuscation, and cherry picking by The Team. One … Continue reading

Posted in Michael E. Mann, Paleoclimatology | Tagged , , , , , , , | 52 Comments

Solar grand minima linked to cooling period in Europe

This is interesting. A quick cooling in Europe together with an increase in humidity and particularly in windiness was found to coincide with a long-term reduction in solar activity 2800 years ago during something called the “Homeric minimum”. The paper … Continue reading

Posted in Paleoclimatology, Solar | Tagged , , , , , , , , | 118 Comments

Does CO2 correlate with temperature history? – A look at multiple timescales in the context of the Shakun et al. paper

Guest post by Michael Pacnik Especially in the context of recent discussion of the Shakun et al. paper, a look at other sources for temperature history versus CO2 can be helpful, examining timescales ranging from the past century to the … Continue reading

Posted in Carbon dioxide, Paleoclimatology | Tagged , , , , , , , | 144 Comments

Dusting for Fingerprints in the Holocene

Guest Post by David Middleton Fingerprints are admissible evidence in criminal trials because of their uniqueness. The probability of two human beings having identical fingerprints is very low. Measurements of δ13C depletion have often been cited as anthropogenic “fingerprints,” proving … Continue reading

Posted in Alarmism, Carbon dioxide, Paleoclimatology | Tagged , , , , , , , | 247 Comments

Ambler’s rebuttal to Mann in the Wall Street Journal

Guest post by Harold Ambler The reasons that climatologist Michael Mann is as successful as he is are multiple: 1. He told the United Nations something that it was dying to hear (he offered certainty when all else saw uncertainty) 2. … Continue reading

Posted in Michael E. Mann | Tagged , , , , , , , | 63 Comments

The End Holocene, or How to Make Out Like a ‘Madoff’ Climate Change Insurer

Guest post by William F. McClenney This post is essentially an update to The Antithesis and On “Trap Speed”, the ACC and the SNR. The entire non-debate on anthropogenic climate effects has always struck me “as two fleas arguing over … Continue reading

Posted in Paleoclimatology | Tagged , , , , , , , | 130 Comments