• Privacy Policy
  • About Us
  • Contact Us
Climate Change Dispatch
  • Home
  • Videos
  • Who We Are
  • Facts Vs. Fearmongering
    • Real science vs Junk Science
      • 1100-plus Peer-Reviewed Studies
      • 97% – Myth of the Climate Change Consensus
      • Michael Crichton: Aliens Cause Global Warming
      • Climate change and its causes
      • Climate Science Primer
      • CO2 is not pollution
      • Deceptive Surface Temperature Records
      • Editorial: Great Global Warming Hoax
      • Rules for Climate Radicals: Part 1
      • Rules for Climate Radicals: Part 2
      • Rules for Climate Radicals: Part 3
      • Why CO2 Is A Minor Player In Global Climate
      • Why Politicized Science Is So Dangerous
    • Facts Not Fear
      • A Simple Question For Climate Alarmists
      • Climate Change – The Facts
      • Climate Change Fears Are Empirically Baseless
      • Global Warming 101
      • Global Warming Q&A
      • Understanding The Medieval Warm Period
      • Ocean Cycles and Climate
      • Overview of Plate Climatology Theory
      • Precautionary Principle
      • Should We Celebrate Carbon Dioxide?
      • The Skeptics Handbook
      • Weather Versus Climate
      • Why I’m a GW skeptic
      • Winning the climate debate with facts
      • Why Aliens Cause Global Warming
    • Greenhouse FAQs
      • CO2, Plants, & Industry
      • How much have temps changed?
      • How much have temps changed?
      • How much have temps changed?
      • Is global warming real?
      • Measuring temperature
      • Swimming in CO2?
      • Scientists urge caution?
      • Today’s warming trend
      • Variations in temperature
    • Gore’s Greatest Goofs
      • Deconstructing the Truth
      • Fact-Checking Al Gore’s Latest Predictions
      • How Gore Created The Global Warming Hoax
    • Inside Real Climate
      • Closer look at the 97% Consensus
      • GW’s Amazing Story
      • IPCC gets failing grade
      • Real Climate Exposed!
      • Truth about Real Climate
      • We’ve Been Conned
      • What is there a 97% consensus about?
    • Behind the IPCC
      • 1,000 Scientists Dissent
      • Climategate: Caught Green-Handed!
      • Climategate Inquiries
      • Climategate Inquiries 2
      • NIPCC Report Now Available
      • Understanding the Climategate Inquiries
  • Submissions
  • Contact Us
No Result
View All Result
  • Home
  • Videos
  • Who We Are
  • Facts Vs. Fearmongering
    • Real science vs Junk Science
      • 1100-plus Peer-Reviewed Studies
      • 97% – Myth of the Climate Change Consensus
      • Michael Crichton: Aliens Cause Global Warming
      • Climate change and its causes
      • Climate Science Primer
      • CO2 is not pollution
      • Deceptive Surface Temperature Records
      • Editorial: Great Global Warming Hoax
      • Rules for Climate Radicals: Part 1
      • Rules for Climate Radicals: Part 2
      • Rules for Climate Radicals: Part 3
      • Why CO2 Is A Minor Player In Global Climate
      • Why Politicized Science Is So Dangerous
    • Facts Not Fear
      • A Simple Question For Climate Alarmists
      • Climate Change – The Facts
      • Climate Change Fears Are Empirically Baseless
      • Global Warming 101
      • Global Warming Q&A
      • Understanding The Medieval Warm Period
      • Ocean Cycles and Climate
      • Overview of Plate Climatology Theory
      • Precautionary Principle
      • Should We Celebrate Carbon Dioxide?
      • The Skeptics Handbook
      • Weather Versus Climate
      • Why I’m a GW skeptic
      • Winning the climate debate with facts
      • Why Aliens Cause Global Warming
    • Greenhouse FAQs
      • CO2, Plants, & Industry
      • How much have temps changed?
      • How much have temps changed?
      • How much have temps changed?
      • Is global warming real?
      • Measuring temperature
      • Swimming in CO2?
      • Scientists urge caution?
      • Today’s warming trend
      • Variations in temperature
    • Gore’s Greatest Goofs
      • Deconstructing the Truth
      • Fact-Checking Al Gore’s Latest Predictions
      • How Gore Created The Global Warming Hoax
    • Inside Real Climate
      • Closer look at the 97% Consensus
      • GW’s Amazing Story
      • IPCC gets failing grade
      • Real Climate Exposed!
      • Truth about Real Climate
      • We’ve Been Conned
      • What is there a 97% consensus about?
    • Behind the IPCC
      • 1,000 Scientists Dissent
      • Climategate: Caught Green-Handed!
      • Climategate Inquiries
      • Climategate Inquiries 2
      • NIPCC Report Now Available
      • Understanding the Climategate Inquiries
  • Submissions
  • Contact Us
No Result
View All Result
Climate Change Dispatch
No Result
View All Result

Mann, Hayhoe Try To Erase To The Pesky Medieval Warm Period

by James Taylor
October 03, 2019, 3:28 PM
in News and Opinion
Reading Time: 3 mins read
A A
7

dilbert cartoon climate models

Climate alarmists Michael Mann and Katharine Hayhoe have been caught using dubious, revisionist temperature data in their attempt, as one Climategate email author put it,  to “deal a mortal blow” to the extensively documented Medieval Warm Period.

Before climate change became a political issue, it was scientifically well-established that a significant global warming event occurred between approximately 900 AD and 1200 AD.

For example, the United Nations Intergovernmental Panel on Climate Change (IPCC) First Assessment Report presented a temperature history and visual graph documenting that the Medieval Warm Period existed and that it brought temperatures at least as warm as today (at pg. 7).

Multiple peer-reviewed studies provided additional confirmation of the Medieval Warm Period.

The warming climate of the Medieval Warm Period spurred abundant crop production, fewer extreme droughts and floods, a growing human population, and improving living standards.

The Little Ice Age terminated the Medieval Warm Period and brought devastating weather extremes, widespread crop failures, famines, plagues like the Black Death, and a contracting human population.

For a good summary of the extensive benefits of the Medieval Warm Period and the devastating harms of the Little Ice Age, see the excellent book, “In the Wake of the Plague: The Black Death and the World It Created.”

The existence of large historical temperature fluctuations, warmer temperatures than today, and many documented benefits of those warmer temperatures presented a powerful obstacle in alarmists’ attempts to brand our current modest warming an unprecedented climate crisis.

One of the many embarrassing emails leaked in the Climategate scandal showed how alarmists deliberately set a goal of eliminating the historical existence of the Medieval Warm Period.

Alarmist climate scientist Jonathan Overpeck wrote in an email to fellow alarmist Keith Briffa, “I get the sense that I’m not the only one who would like to deal a mortal blow to the misuse of supposed warm period terms and myths in the literature.”

Also, scientist David Deming testified to Congress that a prominent figure working in the field of climate change asserted to him, “We have to get rid of the Medieval Warm Period.”

We have often been told that the science is settled. Apparently, that doesn’t apply to scientific data and evidence invalidating climate alarmism.

Mann last month favorably retweeted an assertion that present temperatures are the warmest they have been for at least the past 5,000 years.

Hayhoe earlier this year gave a presentation in which she presented a graph (without any scientific citation) asserting temperatures steadily and consistently declined for 4,000 years – without any significant variation – prior to the warming of the past 120 years that finally and mercifully brought an end to the Little Ice Age (at 7:41).

As documented above, the existence of substantial historical climate variations such as the Medieval Warm Period and the Little Ice Age were scientifically well-documented and not in dispute before climate activism politicized the issue.

Alarmist scientists were on record searching for justifications to eliminate these inconvenient climate variations that blew gaping holes in their alarmist theories.

Now, conveniently, alarmists like Mann and Hayhoe claim the Medieval Warm Period, the Little Ice Age, and other well-documented warm and cold periods simply did not exist.

An old sarcastic saying goes, “When the facts don’t fit the theory, change the facts.” Mann and Hayhoe provide perfect real-world examples of such perniciousness.

Powerful scientific evidence supported near-universal agreement about the existence of the Medieval Warm Period.

Then Mann and Hayhoe, supported by little or no compelling evidence, waved a magic wand and made the Medieval Warm Period conveniently disappear.

Climate realists, however, will stick with the powerful scientific evidence, the long-established scientific “consensus,” the peer-reviewed scientific literature, and the findings of the IPCC.

Sorry, Mann and Hayhoe, but you have been caught red-handed.

Read more at CFACT

  • Truth
  • Twitter
  • Facebook
  • LinkedIn
  • Gettr
  • Threads
  • gab-logo Gab
  • Mastodon
  • Buffer
  • Telegram
  • Email
  • Copy Link
  • Share Using More Networks…

Popular Posts

Electric Vehicles (EVs)

The ‘Green’ Scam Of The Century: How ‘Renewables’ Increase Fossil Fuel Demands

Oct 23, 2024
News and Opinion

Antarctica Is Colder, Icier Today Than At Any Time In 5,000 Years

Apr 15, 2024
Energy

30-Plus Signs That The Climate Scam Is Collapsing

Apr 09, 2025

Comments 7

  1. Roger Payne says:
    6 years ago

    We never knew Michael Mann was over 5000 years old and alert enough to observe temperatures. he looks in good from apart from some overweight.

    Excellent BBC TV programme, “A day in he Life of Earth”,showed the vast array of known factors every second of each day, all shifting, all interlinked, which rule Earth and life. Volcanoes, forest fires each day somewhere, very necessary, cosmic bombardments, ocean life creating oxygen, shifts in the galaxy, plankton, sun cycles, moon cycles,, gravity, dust storms fertilising life in distant places,ice, poles, etc etc. No mention of CO2! except in photosynthesis. No mention of IPCC politics either.

    Reply
  2. JayPee says:
    6 years ago

    When history doesn’t validate your current theorizing

    CHANGE HISTORY !

    It has worked well for the communists and fascists
    Hey

    Whatever will quell the masses.

    Reply
  3. Spurwing Plover says:
    6 years ago

    Time for Hayhoe and Mann to have a big cut in their bank accounts by
    100% Uncle Sam and Lady Liberty put these two on a budget

    Reply
  4. David Lewis says:
    6 years ago

    The Medieval Warm Period undermines the climate change fraud in two ways. One, it shows that temperatures warmed without changing concentrations of carbon dioxide. Second, it shows that warming is beneficial, not harmful. An honest scientist would use this data to conclude we don’t have a problem with global warming. This obviously does not apply to Michael Mann and Katharine Hayhoe. I wonder if it is new taxes or bigger government that they are so adamant to support.

    Reply
  5. Amber says:
    6 years ago

    It’s not data…. it’s” intellectual property” …never to be seen apparently .
    Not even a judge gets to see .
    Isn’t intellectual a stretch ? How would you know ?
    Real scientists show their work .
    No way to hide the decline in scientists .
    At least some are stepping up and they need to .
    The underlying justification to the climate fear industry are just climate models that are incomplete and wildly wrong because they can’t accurately predict the biggest variables to climate . … Natural variables .
    How did the scam ever get this far is the real question ?
    How did Michael Moore’s investigation go ? How many unreturned phone calls ? Hmm why could that be ?
    Hollywood is so terrified to touch this because many of them enabled the fraud . A massive fraud .
    The plot is easy and records prove it .
    The UN needed a cause to really public support for their globalist objectives
    Maurice Strong UN Under -Secretary-General of the United Nations laid it out .
    Rent seekers saw an opportunity to shake down tax payers because policy would favor draconian tax , and grant measures . Hello Al Gore .
    Chicago Climate Exchange ring a bell ? Trade carbon offsets the plan .
    Financially failing governments the world over saw a new feel good tax and jumped on board .
    The end result massive unwarranted energy cost increases and 10’s of thousands of fuel poverty deaths per year . How convenient for the population pruners in on the scam . A civil way to eliminate millions . Eat or heat ?
    Oh and lets not forget the $trilions wasted in a ludicrous scam to contol the earths temperature through a trace gas .
    The good news is real scientists are now increasingly stepping up to call out the utter rubbish of the promoters .
    500 hundred of them just told the UN ..”There is no climate emergency.”
    No kidding . Now that is the inconvenient truth .
    Come on Micheal you want truth ? Let it rip . It’s all there .

    Reply
    • Ilma says:
      6 years ago

      You claim ‘intellectual property’ if you want to monetise it by publishing & selling it, yet he seemingly never has. You wonder why?

      Reply
  6. Graham McDonald says:
    6 years ago

    When you don’t have to throw out more than 50% of your data, you can consider the experiment a success.

    Reply

Comments are welcome! Those that add no discussion value may be removed.Cancel reply

Stay Connected On Social Media

gab-logo

Donate Today

Beating back the alarmist narrative takes time and money. Please donate today to help!

Recent Posts

  • oil rig drillAmerica’s Energy Boom Exposes The Folly Of Britain’s Net Zero Disaster
    Oct 3, 2025
    America’s energy boom and policy flexibility are widening the economic gap with Britain, where high prices and net zero goals are stalling growth. […]
  • Arctic sunsetNew Study Shows Arctic Sea Ice Decline Slowing, Driven More by Natural Variability Than Emissions
    Oct 3, 2025
    New study shows Arctic sea ice decline has slowed since 2012, driven more by natural variability than greenhouse gas emissions. […]
  • Attorney General Rob BontaNewsom Backs Off Climate Fight As AG Bonta Doubles Down On Suing Energy Firms
    Oct 3, 2025
    Two years after launching a high-profile climate lawsuit, Newsom is backing off while AG Rob Bonta doubles down on lawfare against major energy firms. […]
  • Farm irrigationMeteorologist Debunks Reuters’ Claim That Climate Change Threatens Europe’s Resources
    Oct 2, 2025
    Data show Europe’s droughts, weather, and biodiversity issues stem from mismanagement, not climate change, despite alarmist media claims. […]
  • Russ VoughtTrump Nixes $8B In ‘Green New Scam Funding’ In NYC, Blue States
    Oct 2, 2025
    Trump DOE halted billions in green energy projects citing poor economics, DEI hiring, and weak energy impact, sparking backlash in blue states. […]
  • SherrillRising Energy Costs And Dem Green Policies Top Of Mind In NJ Gubernatorial Race
    Oct 2, 2025
    New Jersey voters face rising energy costs as Democratic green policies and offshore wind expansion drive utility bills higher. […]
  • Hochul's green stringsHochul’s Election-Year ‘Inflation Refund’ Checks Can’t Cover Costs Of Her Green Agenda
    Oct 2, 2025
    Hochul’s election-year ‘inflation refund’ checks won’t offset the soaring living costs and utility hikes her green-energy agenda created. […]
  • South Asia monsoonSouth Asia Monsoons Not Becoming More Dangerous From Climate Change, Data Confirms
    Oct 1, 2025
    Claims that climate change is making South Asia’s monsoons more extreme ignore history, data, and other major causes of flooding. […]
  • wildfire carsRick Scott Wants Answers On What California Did With Federal Wildfire Funds
    Oct 1, 2025
    Sen. Rick Scott is demanding answers on how California spent federal money earmarked for preventing and fighting wildfires. […]
  • Biden test driving an all-electric Ford F-150.Ford CEO Warns U.S. EV Sales Could Halve After Federal Subsidies End
    Oct 1, 2025
    Ford warns U.S. electric vehicle sales could drop as much as 5% after the $7,500 taxpayer-funded federal subsidies expire in a month. […]

Get Instant Email Notifications

Subscribe to receive a digest of daily stories, or get emailed once they're published. Check your Junk/Spam folder for a verification email.

Submit a tip

Please enter your email, so we know you're human.

Books You May Like

very convenient warming

exposing great lie

Have a suggestion? Let us know! We swap out books based on your input. We participate in the Amazon Services LLC Associates Program. See here.

  • About
  • Privacy Policy
  • Contact Us

© Portions copyright Climate Change Dispatch

No Result
View All Result
  • Home
  • Videos
  • Who We Are
  • Facts Vs. Fearmongering
    • Real science vs Junk Science
      • 1100-plus Peer-Reviewed Studies
      • 97% – Myth of the Climate Change Consensus
      • Michael Crichton: Aliens Cause Global Warming
      • Climate change and its causes
      • Climate Science Primer
      • CO2 is not pollution
      • Deceptive Surface Temperature Records
      • Editorial: Great Global Warming Hoax
      • Rules for Climate Radicals: Part 1
      • Rules for Climate Radicals: Part 2
      • Rules for Climate Radicals: Part 3
      • Why CO2 Is A Minor Player In Global Climate
      • Why Politicized Science Is So Dangerous
    • Facts Not Fear
      • A Simple Question For Climate Alarmists
      • Climate Change – The Facts
      • Climate Change Fears Are Empirically Baseless
      • Global Warming 101
      • Global Warming Q&A
      • Understanding The Medieval Warm Period
      • Ocean Cycles and Climate
      • Overview of Plate Climatology Theory
      • Precautionary Principle
      • Should We Celebrate Carbon Dioxide?
      • The Skeptics Handbook
      • Weather Versus Climate
      • Why I’m a GW skeptic
      • Winning the climate debate with facts
      • Why Aliens Cause Global Warming
    • Greenhouse FAQs
      • CO2, Plants, & Industry
      • How much have temps changed?
      • How much have temps changed?
      • How much have temps changed?
      • Is global warming real?
      • Measuring temperature
      • Swimming in CO2?
      • Scientists urge caution?
      • Today’s warming trend
      • Variations in temperature
    • Gore’s Greatest Goofs
      • Deconstructing the Truth
      • Fact-Checking Al Gore’s Latest Predictions
      • How Gore Created The Global Warming Hoax
    • Inside Real Climate
      • Closer look at the 97% Consensus
      • GW’s Amazing Story
      • IPCC gets failing grade
      • Real Climate Exposed!
      • Truth about Real Climate
      • We’ve Been Conned
      • What is there a 97% consensus about?
    • Behind the IPCC
      • 1,000 Scientists Dissent
      • Climategate: Caught Green-Handed!
      • Climategate Inquiries
      • Climategate Inquiries 2
      • NIPCC Report Now Available
      • Understanding the Climategate Inquiries
  • Submissions
  • Contact Us

© 2025 Climate Change Dispatch

Share via
  • Facebook
  • Like
  • Twitter
  • Pinterest
  • LinkedIn
  • Digg
  • Tumblr
  • VKontakte
  • Print
  • Email
  • Reddit
  • Buffer
  • Love This
  • Weibo
  • Pocket
  • Xing
  • Odnoklassniki
  • WhatsApp
  • Meneame
  • Blogger
  • Amazon
  • Yahoo Mail
  • Gmail
  • AOL
  • Newsvine
  • HackerNews
  • Evernote
  • MySpace
  • Mail.ru
  • Viadeo
  • Line
  • Flipboard
  • Comments
  • SMS
  • Viber
  • Telegram
  • Subscribe
  • Facebook Messenger
  • Kakao
  • LiveJournal
  • Yammer
  • Edgar
  • Fintel
  • Mix
  • Instapaper
  • Copy Link
  • Truth
  • gab-logo Gab
  • Gettr
  • Baidu
  • Mastodon
  • Threads
  • Bluesky
Share via
  • Digg
  • Tumblr
  • VKontakte
  • Print
  • Email
  • Reddit
  • Buffer
  • Love This
  • Weibo
  • Pocket
  • Xing
  • Odnoklassniki
  • WhatsApp
  • Meneame
  • Blogger
  • Amazon
  • Yahoo Mail
  • Gmail
  • AOL
  • Newsvine
  • HackerNews
  • Evernote
  • MySpace
  • Mail.ru
  • Viadeo
  • Line
  • Flipboard
  • Comments
  • SMS
  • Viber
  • Telegram
  • Subscribe
  • Facebook Messenger
  • Kakao
  • LiveJournal
  • Yammer
  • Edgar
  • Fintel
  • Mix
  • Instapaper
  • Copy Link
  • Truth
  • gab-logo Gab
  • Gettr
  • Baidu
  • Mastodon
  • Threads
  • Bluesky