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Michael E. Mann
Dr. Michael E. Mann is Distinguished Professor of Meteorology at Penn State University, with joint appointments in the Department of Geosciences and the Earth and Environmental Systems Institute (EESI). He is also director of the Penn State Earth System Science Center (ESSC). He was selected by Scientific American as one of the fifty leading visionaries in science and technology in 2002. He contributed, with other IPCC authors, to the award of the 2007 Nobel Peace Prize. He was awarded the Hans Oeschger Medal of the European Geosciences Union in 2012. He is a Fellow of both the American Geophysical Union and the American Meteorological Society. He has published two books including Dire Predictions: Understanding Global Warming in 2008 and The Hockey Stick and the Climate Wars: Dispatches from the Front Lines in 2012. He is also a co-founder and avid contributor to the award-winning science website

Entries by Michael E. Mann

How Likely Is The Observed Recent Warmth?

(5) Comments | Posted January 25, 2016 | 10:33 AM

With 2015 having now come to completion, the preliminary numbers suggest that it will, by a substantial margin, be the new record-holder, the warmest year in recorded history for both the globe and the Northern Hemisphere. The title was sadly short-lived for previous record-holder 2014. And...

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How Close Are We to 'Dangerous' Planetary Warming?

(95) Comments | Posted December 23, 2015 | 3:37 PM

In the wake of the COP 21 UN Climate Summit in Paris (see this recent Huffington Post piece for my take on the agreement), a number of important questions still remain unanswered. Take for example the commitment reached by the 197 participating nations to limit warming...

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The Power of Paris: Climate Challenge Remains, But Now We're on the Right Path

(89) Comments | Posted December 13, 2015 | 2:11 PM

From the outset, we knew that the Paris climate summit wasn't going to be the end of the ongoing challenge to avert dangerous climate change. As we learned through the first 20 years of U.N. negotiations, it's extremely difficult to get the nearly 200 countries of the world...

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Doubling Down on Denial and Deceit

(135) Comments | Posted September 21, 2015 | 11:28 AM

Thanks to a months-long investigation by the Pulitzer-prize winning Inside Climate News, we learned last week that ExxonMobil's own scientists had secretly confirmed the science behind human-caused climate change as early as the late 1970s.

Yes -- this is the same ExxonMobil that has funded...

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The 'Fat Tail' of Climate Change Risk

(244) Comments | Posted September 11, 2015 | 10:01 AM

One of the most under-appreciated aspects of the climate change problem is the so-called "fat tail" of risk. In short, the likelihood of very large impacts is greater than we would expect under typical statistical assumptions.

We are used to thinking about likelihoods and probabilities in terms of the familiar...

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Climate Oscillations and the Global Warming Faux Pause

(240) Comments | Posted February 26, 2015 | 2:04 PM

No, climate change is not experiencing a hiatus. No, there is not currently a "pause" in global warming.

Despite widespread such claims in contrarian circles, human-caused warming of the globe proceeds unabated. Indeed, as reported here at The Huffington Post just last month, the most recent year (2014)...

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Climate Change and the Record 2014 California Drought

(71) Comments | Posted December 8, 2014 | 1:01 PM

Just a couple months ago, I critiqued a pair of studies that disputed any linkage between human-caused climate change and the exceptional 2014 California drought. Now comes yet another study ("Causes and Predictability of the 2011-14 California Drought") with the imprimatur of the National Oceanic and...

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Curry Advocates Against Action on Climate Change

(615) Comments | Posted October 17, 2014 | 10:27 AM

Georgia Tech's Judith Curry has authored an op-ed in the Wall Street Journal claiming that "there is less urgency to phase out greenhouse gas emissions now" than in the past. This could not be further from the truth.

She ties her argument to a new...

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Read the Article!

(2) Comments | Posted October 10, 2014 | 4:34 PM

A note to scientists: If you're going to criticize previous work, at least make sure you've read it carefully. There is an unfortunate recent case in point that I'd like to discuss (full disclosure: it regards a criticism of some of my own recent work). But first, a bit of...

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If a Tree Falls in the Forest, But No Scientist Says So...

(39) Comments | Posted October 3, 2014 | 10:57 AM

Recently, the highly respected Bulletin of the American Meteorology Society ("BAMS" to those in the know), published a special issue consisting of a couple dozen articles investigating the potential impact climate change might have had on various extreme weather events of 2013. This has become somewhat...

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The Gathering Storm

(26) Comments | Posted September 19, 2014 | 1:43 PM

Winston Churchill saw the gathering storm long before the rest of the world. Europe sacrificed millions of people before it openly acknowledged and then directly confronted the crisis. Yet, even after the Allies responded, the outcome was uncertain. Only when the U.S. entered the fray could the Allies see a...

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Fire and Ice: What I Did on My Summer Vacation

(74) Comments | Posted August 7, 2014 | 10:46 AM

I did my best to get away from work last week while my family and I were on vacation visiting friends who live in Kalispell, the gateway to Montana's Glacier National Park. But it wasn't quite possible. You see, I'm a climate scientist. And the spectre of climate change stares...

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Interests, Ideology And the Climate Denial Machine

(10) Comments | Posted June 9, 2014 | 6:19 PM

Paul Krugman has an interesting op-ed in yesterday's New York Times entitled "Interests, Ideology & Climate." In this commentary, Krugman argues that the current campaign to deny climate change is steeped more in political ideology than in industry-funded opposition.

I'm a big fan of Krugman's work, and he...

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Climate Contrarians Cook Up New 'Controversy'

(58) Comments | Posted May 18, 2014 | 4:25 PM

Misplaced cries of McCarthyism: an attempt to muddy the climate change waters.

Recently, a somewhat obscure scientific journal rejected a paper. Somehow, that made the front page of the London Times and spawned a number of articles in the right-wing press. How in the world does a rejected manuscript warrant...

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Earth Will Cross the Climate Danger Threshold by 2036

(488) Comments | Posted March 19, 2014 | 3:13 PM

This article was originally published in Scientific American.

The rate of global temperature rise may have hit a plateau, but a climate crisis still looms in the near future.

"Temperatures have been flat for 15 years--nobody can properly explain it," the Wall...

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Global Warming Speed Bump? The Answer May Be Blowing in the Wind!

(142) Comments | Posted February 9, 2014 | 8:01 PM

An interesting new paper by Matthew England and colleagues just published in the journal Nature Climate Change tosses another hat in the ring when it comes to explanations of the so-called "hiatus" or "pause" (I prefer "speed bump") in global warming.

As I have discussed...

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Drunken Arctic Goes Head Over Heels

(102) Comments | Posted January 31, 2014 | 10:13 AM

Even in a warmed world, winter can be cold. But is the Arctic wintering down south?

Over the past couple of months, the U.S. has seen the return of something many believed had been lost for good: cold weather.

Although the current temperatures in the eastern U.S. may seem unusually...

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Something Is Rotten at the New York Times

(234) Comments | Posted November 21, 2013 | 7:21 PM

Something is rotten at the New York Times.

When it comes to the matter of human-caused climate change, the Grey Lady's editorial page has skewed rather contrarian of late.

A couple months ago, the Intergovernmental Panel on Climate Change (IPCC) published its 5th scientific assessment, providing...

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Super Typhoon Haiyan: Realities of a Warmed World

(276) Comments | Posted November 17, 2013 | 1:32 PM

It is with a heavy heart and a respectful hand that I write this. Super Typhoon Haiyan has only just passed, and the devastation cannot yet even be fully understood. With that in mind, please consider a donation to the Philippine Red Cross.

But that will...

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Pacific Ocean Warming at Fastest Rate in 10,000 Years

(1058) Comments | Posted October 31, 2013 | 3:11 PM

Just how rapid is the current rate of warming of the ocean? There is an interesting new article by Rosenthal and collaborators in the latest issue of the journal Science entitled "Pacific Ocean Heat Content During the Past 10,000 Years" that attempts to address this question. The article...

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