Michael E. Mann

Michael E. Mann

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Climate scientist; climate dynamics, policy

Enroll in Updated Global Climate Change Course This Fall
SocialApr 28, 2026

Enroll in Updated Global Climate Change Course This Fall

Hey @Penn undergrads: Concerned about the #climatecrisis? Want to learn more about the science, the impacts, and the solutions? Please sign up for my updated and revamped course on "Global Climate Change" this Fall: https://t.co/zCR2SUI4Nb

By Michael E. Mann
Hank Green Exposes Koch-Funded Climate Disinformation Campaign
SocialApr 28, 2026

Hank Green Exposes Koch-Funded Climate Disinformation Campaign

"A Masterclass in Manipulation" | @HankGreen debunks right wing Koch-funded (https://t.co/H9MX8ptZLO) @Reason magazine's latest disinformation efforts on climate (including their incoherent attack on the #HockeyStick): https://t.co/jAwwnGt1Yv

By Michael E. Mann
Mann Research Predicts 10±3 Storms, Quiet Season via El Niño
SocialApr 24, 2026

Mann Research Predicts 10±3 Storms, Quiet Season via El Niño

The @MannResearch group seasonal hurricane forecast is out. We call for 10 +/- 3 named storms this season. The forecast for a relatively quiet season is driven largely by the prediction of a substantial El Niño event: https://t.co/FIkZFydFca

By Michael E. Mann
Bezos and Washington Post Threaten American Democracy
SocialApr 22, 2026

Bezos and Washington Post Threaten American Democracy

Jeff Bezos is a bad actor and the Washington Post is now a font of disinformation and propaganda and a threat to American Democracy

By Michael E. Mann
NOAA Defines El Niño Using Relative, Not Absolute, Nino Indices
SocialApr 21, 2026

NOAA Defines El Niño Using Relative, Not Absolute, Nino Indices

NOAA uses the *relative* Nino (or "RONI") indices, as shown below, to define El Nino state (>0.5C = El Nino; <-0.5C = La Nina, neutral otherwise). Some will try to confuse you by showing absolute Nino values (which depend on...

By Michael E. Mann
Climate Change's Reality Unveiled in Today's Interview
SocialApr 21, 2026

Climate Change's Reality Unveiled in Today's Interview

"This Is What Climate Change Looks Like Right Now" | My interview earlier today with the great @Thom_Hartmann: https://t.co/WIK6gYSzyK

By Michael E. Mann
Nino Indices Reveal Complex, Unsettled Climate State
SocialApr 20, 2026

Nino Indices Reveal Complex, Unsettled Climate State

Latest (TODAY) Nino indices posted by CPC. Neg (blue) is on La Nina side of neutral, pos (orange) on El Nino side. Pos/neg values <0.5 considered neutral. The 4 indices show wide spread indicating complexity of current state. We'll have...

By Michael E. Mann
Expert Sees Strong El Niño Signal Despite 25% NOAA Odds
SocialApr 20, 2026

Expert Sees Strong El Niño Signal Despite 25% NOAA Odds

NOAA CPC's latest (today) update is out (https://t.co/KrBrq60pvL). They estimate a 25% chance of a "very strong" El Nino. But "Mikeythe4th_WX" on twitter has a different view:

By Michael E. Mann
Debunking Weather Hype: Trust NOAA over Influencers
SocialApr 20, 2026

Debunking Weather Hype: Trust NOAA over Influencers

Posted this thread in response to the engagement-farming wannabe weather influencers insisting they know more than the NOAA Climate Prediction Center: https://t.co/dVNtX0kjFp https://t.co/8z7gOlhgUi

By Michael E. Mann
Neutral Now, 61% Chance El Niño Emerging Soon
SocialApr 20, 2026

Neutral Now, 61% Chance El Niño Emerging Soon

NOAA's latest update on state of El Niño, just 3 hours old. Summary: 1. We're in neutral conditions & will likely remain that way for several months. 2. Likely (61% chance) El Niño will emerge, but magnitude quite uncertain as we have not...

By Michael E. Mann
Actual NOAA Data Shows La Nina Weakening to Neutral
SocialApr 20, 2026

Actual NOAA Data Shows La Nina Weakening to Neutral

Wow the post below from @webberweather is shockingly dishonest. Lying to public helps nobody. Here's the ACTUAL (relative) Nino3.4 data from NOAA, which shows we've gone from strong La Nina 3 months ago to weakly negative (basically neutral) values now: https://t.co/1KQlch8trD https://t.co/UEb9Rcncua

By Michael E. Mann
Science Under Siege: Climate Crisis Discussion at 1 PM ET
SocialApr 20, 2026

Science Under Siege: Climate Crisis Discussion at 1 PM ET

Looking forward to speaking with my friend @Thom_Hartmann of the #ThomHartmannProgram today at 1pm ET. Topic--#ScienceUnderSiege & the escalating climate crisis. Please tune in: https://t.co/gndwJ3RDAM

By Michael E. Mann
Legendary Climate Scientist Dave Fenton Shares His Fight
SocialApr 20, 2026

Legendary Climate Scientist Dave Fenton Shares His Fight

"The Climate Scientist Who Fought Back" | My interview with the legendary @DFenton for the new #FentonForecast podcast: https://t.co/VDlK4k3KEM

By Michael E. Mann
Climate‑Driven Drought Fuels Migration and Conflict
SocialApr 18, 2026

Climate‑Driven Drought Fuels Migration and Conflict

"Drought, Migration and the Fall of Civilization: A Cautionary Tale" | Seemed appropriate to be re-upping this op-ed I wrote a few years ago for @thehill on the role of climate-driven conflict in the middle east: https://t.co/C8fyuYwyl6

By Michael E. Mann
Public Science Under Siege: From Frontier to Target
SocialApr 18, 2026

Public Science Under Siege: From Frontier to Target

"From Endless Frontier to Enemy of the People: The Assault on Public Science" | A very nice, thoughtful review of #ScienceUnderSiege (by @PeterHotez & yours truly) by Wendy Wagner for @Lawfare Media: https://t.co/2QcaDNC3df

By Michael E. Mann
Science and Innovation Chart Climate’s Future Path
SocialApr 14, 2026

Science and Innovation Chart Climate’s Future Path

“The Climate Path Forward: Science and Innovation” | My first panel at #CWA tomorrow 3:30pm Mountain Time (remote option available)

By Michael E. Mann
Critique: Normalizing Effects with Arbitrary Exponential Scaling
SocialApr 13, 2026

Critique: Normalizing Effects with Arbitrary Exponential Scaling

I’m sure Roger Pielke Jr can find some arbitrary exponentially increasing quantity to divide by and normalize away this effect

By Michael E. Mann
Hacker Targeting Climate Activists Extradited to New York
SocialApr 12, 2026

Hacker Targeting Climate Activists Extradited to New York

"Suspect in Hacking of Climate Activists Is Extradited to New York" via @NYTimes| There's a link to early attacks on me and other climate scientists & advocates via the shadowy "DCI Group" -- a fossil fuel-funded black ops groups 🧵 https://t.co/PkBDgEkhqd

By Michael E. Mann
Decade-Old Study Warns of Looming Climate Tipping Point
SocialApr 12, 2026

Decade-Old Study Warns of Looming Climate Tipping Point

Despite the title of this @NatureClimate Change commentary, it's not about NATO. It's about one of the worrying potential climate tipping points, and research we (@rahmstorf et al) did about this a decade ago... https://t.co/NOYmx9O3R7

By Michael E. Mann
Celebrating 15 Years of Landmark Climate Research
SocialApr 11, 2026

Celebrating 15 Years of Landmark Climate Research

On its 15th birthday, @NatureClimate Change has looked back at some groundbreaking articles it has published over the years. I'm proud this article led my friend & colleague Stefan @Rahmstorf (of which I was privileged to be a co-author) is...

By Michael E. Mann
Climate Models Miss Link Between Change and Resonant Waves
SocialApr 11, 2026

Climate Models Miss Link Between Change and Resonant Waves

This was a resonant planetary wave event (more details to come on that--watch this space). Climate models struggle to capture the climate change linkage w/ these events. Some background: https://t.co/IsCfYsAGit https://t.co/LvHlUL6OF7

By Michael E. Mann
Federal Scientists Celebrate Artemis II Success Amid Challenges
SocialApr 9, 2026

Federal Scientists Celebrate Artemis II Success Amid Challenges

"Artemis II: Beleaguered federal scientists take a victory lap" by @chelseaeharvey for @EENewsUpdates /@politico: https://t.co/79kGMuySrj

By Michael E. Mann
Doomism and Geoengineering Advocacy Now Converging, Says Hallam
SocialApr 4, 2026

Doomism and Geoengineering Advocacy Now Converging, Says Hallam

In #NewClimateWar (see excerpt below) I warned back in early 2021 of the growing doomism/geoengineering advocacy nexus. 5 years later, we're seeing it in spades. Witness for example this new commentary (https://t.co/PkgSaNNChT) by "Extinction Rebellion" founder Roger Hallam: https://t.co/HZIAXUYC25

By Michael E. Mann
This Year's Top Picks: Hilariously Honest Kids' Books
SocialApr 4, 2026

This Year's Top Picks: Hilariously Honest Kids' Books

This year's list: The Going to Bed Book The Potty Book for Boys Who Pooped on Me?

By Michael E. Mann
Legacy Media Gives Antiscience Fringe a False Platform
SocialApr 3, 2026

Legacy Media Gives Antiscience Fringe a False Platform

In #ScienceUnderSiege, @PeterHotez & I criticize legacy media outlets like @nytimes for platforming antiscience and, in particular, engaging in performative neutrality where fringe views are presented as if they deserve consideration. From today's Times: https://t.co/J5kGcLpgiY https://t.co/wwB2lfh5wp

By Michael E. Mann
Surface Warming Rises Linearly with Cumulative CO₂ Emissions
SocialApr 1, 2026

Surface Warming Rises Linearly with Cumulative CO₂ Emissions

The scientific consensus is that surface warming is linear in cumulative carbon emissions--there is no evidence of any "tipping point" behavior in global surface temperature (though some climate subsystems e.g. ice sheets may exhibit threshold behavior): https://t.co/9SZ2bigjAM

By Michael E. Mann
Paul Ehrlich's Legacy Highlights Planetary Fragility
SocialMar 31, 2026

Paul Ehrlich's Legacy Highlights Planetary Fragility

"Understanding the fragility of our planetary home: The legacy of Paul Ehrlich" | Commentary in @BulletinAtomic by myself, @PeterGleick & John P. Holdren: https://t.co/2b61PnCaHM

By Michael E. Mann
Penn Scholars Decry Repeal of Greenhouse Gas Findings
SocialMar 31, 2026

Penn Scholars Decry Repeal of Greenhouse Gas Findings

‘Assault on climate action’: Penn experts denounce greenhouse gas finding repeal | Article by Danna Cai in the @DailyPenn: https://t.co/b9Dwk47MkZ

By Michael E. Mann
Methane Cuts Essential; Ignoring Them Risks Climate Tipping
SocialMar 30, 2026

Methane Cuts Essential; Ignoring Them Risks Climate Tipping

Reducing CO2 emissions is paramount. But reducing methane is necessary for avoiding critical warming thresholds. Warning we could soon cross these limits while downplaying the importance of methane reductions is hypocritical.

By Michael E. Mann
Iran Conflict Exposes Fragile Fossil Fuel Economy, Urges Clean Transition
SocialMar 27, 2026

Iran Conflict Exposes Fragile Fossil Fuel Economy, Urges Clean Transition

"Our fossil fuel economy is a house of cards and Trump's war in Iran is about to topple it. The need for a clean energy transition has never been clearer" | My new commentary for @LiveScience: https://t.co/TgUxuicmbz

By Michael E. Mann
Pay‑not‑to‑play Scheme to Block Offshore Wind Wastes Taxpayer Money
SocialMar 23, 2026

Pay‑not‑to‑play Scheme to Block Offshore Wind Wastes Taxpayer Money

“Using a pay-not-to-play scheme to pressure a company to not build offshore wind is an outrageous abuse of taxpayer dollars”

By Michael E. Mann
New Climate Chair Created at UEA with CRU Collaboration
SocialMar 23, 2026

New Climate Chair Created at UEA with CRU Collaboration

Hey academic climate folks, great new chaired position at @uniofeastanglia working w/ the folks at the Climatic Research Unit in Norwich UK: https://t.co/F5KtwO2jse (h/t @TimOsbornClim)

By Michael E. Mann
Record Western Heat Linked to Human‑Caused Climate Change
SocialMar 20, 2026

Record Western Heat Linked to Human‑Caused Climate Change

I'll be talking with the great @AliVelshi about the record heat out west and how it's tied to human-caused climate change TONIGHT ~10:35pm ET on @MSNOWNews @TheLastWord https://t.co/YgANt3LtFM

By Michael E. Mann
Make Days Better, Not Longer: Quality Matters
SocialMar 20, 2026

Make Days Better, Not Longer: Quality Matters

"I cannot make my days longer so I strive to make them better." (Henry David Thoreau was wrong, as it turns out)

By Michael E. Mann
Human‑induced Climate Change Slows Earth’s Spin After 3.6 Million Years
SocialMar 20, 2026

Human‑induced Climate Change Slows Earth’s Spin After 3.6 Million Years

"Human-driven climate change is slowing Earth's rotation at a rate not seen in 3.6 million years" by @SIPappas for @LiveScience: https://t.co/NGg6BxEfj1

By Michael E. Mann
Western U.S. Heat Wave Marks Historic Weather Event
SocialMar 20, 2026

Western U.S. Heat Wave Marks Historic Weather Event

"Maps and charts show how this Western U.S. heat wave is a historic weather moment" by @GregPorter_wx & Anthony Edwards for @SFChronicle (via @YahooNews ): https://t.co/VNcs6TVSAJ

By Michael E. Mann
Offshore Wind Could Counter Trump's Disinformation Campaign
SocialMar 19, 2026

Offshore Wind Could Counter Trump's Disinformation Campaign

"Can Offshore Wind Win The Trump Disinformation War?" by Carolyn Fortuna (@c4tuna31) for @CleanTechnica: https://t.co/XYV8TJiu5e

By Michael E. Mann
Global Temps Hit Multi‑year Low as La Niña Wanes
SocialMar 19, 2026

Global Temps Hit Multi‑year Low as La Niña Wanes

Global surface air temperature anomalies have reached lowest value in several years, as weak La Nina conditions (following 23/24 El Nino) begin to dissipate. It will be interesting to see what happens if the forecast El Nino takes hold later this...

By Michael E. Mann
Human Bio‑Electricity and Fusion Deliver Unlimited Power
SocialMar 19, 2026

Human Bio‑Electricity and Fusion Deliver Unlimited Power

"The human body generates more bio-electricity than a 120-volt battery and coupled with a form of fusion, the machines had found all the energy source they would ever need."

By Michael E. Mann
Escalating Weather Extremes Signal Alarming Climate Trends
SocialMar 19, 2026

Escalating Weather Extremes Signal Alarming Climate Trends

"The Weather Is Getting Wilder, and Some See a Dire Signal in the Data" by @dgelles for the @nytimes: https://t.co/vACrMvG2Tf

By Michael E. Mann
Unprecedented March Heat Wave Linked to Human‑Driven Warming
SocialMar 18, 2026

Unprecedented March Heat Wave Linked to Human‑Driven Warming

I'll be on @BBCWorld News America TONIGHT ~8pm ET to discuss the unprecedented March heat wave in the U.S. and its tie-in to human-caused planetary warming. Please tune in! https://t.co/bmgrFtoNpJ

By Michael E. Mann
Navigating Climate Science Amid Growing Uncertainty
SocialMar 17, 2026

Navigating Climate Science Amid Growing Uncertainty

Horizons Podcast: Climate Science in an Age of Uncertainty | My recent conversation with @PennSAS Dean Mark Trodden https://t.co/8Ocy4Bk1Tg

By Michael E. Mann
Defending Paul Ehrlich's Legacy Amid Smear Campaign
SocialMar 16, 2026

Defending Paul Ehrlich's Legacy Amid Smear Campaign

Since some of the most horrid individuals on this medium are working hard to smear Paul Ehrlich on his passing, here's some relevant background on Paul and his legacy from "The Hockey Stick & the Climate Wars" (https://t.co/y6lplWKpsL) https://t.co/Zu3kNa9C0E

By Michael E. Mann
Warming Sped up After 1980s, Not in Last Decade
SocialMar 16, 2026

Warming Sped up After 1980s, Not in Last Decade

"Why global warming is accelerating & what it means for the future" [note: the rate of warming increased in the '80s as sulphate aerosols subsided but claims it has accelerated over the *past decade* are not supported IMO] by @AlecLuhn...

By Michael E. Mann
Judith Curry Led Trump‑appointed Group to Undermine EPA Science
SocialMar 16, 2026

Judith Curry Led Trump‑appointed Group to Undermine EPA Science

#JudithCurry was a key member of the "unlawful" working group tasked by the Trump administration with discrediting the science underlying the EPA endangerment finding (the legal basis for regulating carbon emissions).

By Michael E. Mann
Iran War Sparks Widespread Health and Environmental Crisis
SocialMar 14, 2026

Iran War Sparks Widespread Health and Environmental Crisis

"The Iran War Is Creating a Public Health and Environmental Crisis" by @thor_benson for @RollingStone (via @YahooNews): https://t.co/bAYYyScmwJ

By Michael E. Mann
Sea Level Rise Threatens Far Greater Fatalities Than Expected
SocialMar 13, 2026

Sea Level Rise Threatens Far Greater Fatalities Than Expected

A deadly climate change effect is even worse than feared, study finds” by Doyle Rice for @usatoday: https://www.usatoday.com/story/news/nation/2026/03/08/sea-level-rise-study/89002601007/

By Michael E. Mann
Speaking at ClimateReality 20th Anniversary Training, Nashville May 1‑2
SocialMar 11, 2026

Speaking at ClimateReality 20th Anniversary Training, Nashville May 1‑2

Looking forward to speaking at the the @ClimateReality 20th Anniversary Training conference, May 1-2 in Nashville: https://t.co/gzCwlg5exC https://t.co/dt1EcClzDs

By Michael E. Mann
Scientists Probe Accelerating Warming; Fossil Fuel Cutoff Essential
SocialMar 6, 2026

Scientists Probe Accelerating Warming; Fossil Fuel Cutoff Essential

“Scientists are trying to solve the mystery of whether global warming is speeding up” via Laura Paddison for @cnn. [I’m critical of the study, but we all agree on key point that planet will continue to warm until we stop...

By Michael E. Mann