Blog Profile / RealClimate

Filed Under:Issues & Causes / Climate Change
Posts on Regator:410
Posts / Week:0.9
Archived Since:November 10, 2008

Blog Post Archive

What drives uncertainties in adapting to sea-level rise?

Guest article by Sally Brown, University of Southampton Let me get this off my chest – I sometimes get frustrated at climate scientists as they love to talk about uncertainties! To be sure, their work thrives on it. I’m someone who researches the projected impacts and adaptation to sea-level rise and gets passed ‘uncertain’ climate […]

The Early Anthropocene Hypothesis: An Update

Guest post from Bill Ruddiman, University of Virginia For over a decade, paleoclimate scientists have argued whether the warmth of the last several thousand years was natural or anthropogenic. This brief comment updates that debate, also discussed earlier at RC: Debate over the Early Anthropogenic Hypothesis (2005) and An Emerging View on Early Land Use […]

Unforced Variations: Mar 2016

This month’s open thread. Pros and cons of celebrity awareness-raising on climate? The end of the cherry-picking of ‘pauses’ in the satellite data? Continuing impacts of El Niño? Your choice (except for the usual subjects to be avoided…).

Millennia of sea-level change

How has global sea level changed in the past millennia? And how will it change in this century and in the coming millennia? What part do humans play? Several new papers provide new insights. 2500 years of past sea level variations This week, a paper will appear in the Proceedings of the National Academy of […]

What is the best description of the greenhouse effect?

What exactly is the greenhouse effect? And what does it look like if we view it from a new angle? Of course, we know the answer, and Raymond Pierrehumbert has written an excellent paper about it (Infrared radiation and planetary temperature). Computer code used in climate models contain all the details. But is it possible […]

Marvel et al (2015) Part III: Response to Nic Lewis

The first post in this series gave the basic summary of (henceforth MEA15) and why I think it is an important paper. The second discussed some of the risible immediate media coverage. But there has also been an ‘appraisal’ of the paper by Nic Lewis that has appeared in no fewer than three other climate […]


Ross McKitrick was so upset about a paper ‘Learning from mistakes in climate research’ that he has written a letter of complaint and asked for immediate retraction of the pages discussing his work. This is an unusual step in science, as most disagreements and debate involve a comment or a response to the original article. […]

New On-line Classes and Models

My free online class on entitled Global Warming I: The Science and Modeling of Climate Change has already served 45,000 people (started, not finished) in the four times that it’s run. Now it’s set up in a new format, called “on demand mode”, which allows people to start, progress, and finish on their own […]

Unforced Variations: Feb 2016

This month’s open thread. Just so you know, a lot of people have complained that these threads have devolved – particularly when the discussion has turned to differing visions of solutions – and have therefore become much less interesting. Some suggestions last month were for a side thread for that kind of stuff that wouldn’t […]

Blizzard Jonas and the slowdown of the Gulf Stream System

Blizzard Jonas on the US east coast has just shattered snowfall records. Both weather forecasters and climate experts have linked the high snowfall amounts to the exceptionally warm sea surface temperatures off the east coast. In this post I will examine a related question: why are sea surface temperatures so high there, as shown in […]

2015 Temperatures

To no-one’s great surprise, 2015 was clearly a record year in all the surface temperature analyses (GISTEMP, NOAA, HadCRUT4, Cowtan&Way, JMA + Berkeley Earth). There is a lot of discussion of this in the press, and on the relevant websites, so not much to add here. A few figures didn’t make it into the official […]

Marvel et al (2015) Part 2: Media responses

This is a second post related to the new paper. The first post dealing with its substantive content is here. What with #AGU15 going on, and a little bit of overlap in content with Shindell (2014), NASA wasn’t particularly keen to put out a press release for the paper, but we did get a ‘web […]

Marvel et al (2015) Part 1: Reconciling estimates of climate sensitivity

This post is related to the substantive results of the new Marvel et al (2015) study. There is a separate post on the media/blog response. The by Kate Marvel and others (including me) in Nature Climate Change looks at the different forcings and their climate responses over the historical period in more detail than any […]

Unforced variations: Jan 2016

Happy New Year, and happy new open thread. As per usual, nuclear energy is off-topic – it’s not that it’s uninteresting, but it ends up dominating conversation to the total exclusion of everything else and just becomes repetitive and dull. Recent excursions on this topic shows what happens when we relax the moderation, so back […]

Unforced Variations: Dec 2015

This is a belated open thread for this month, for anything non-COP21 and non-AGU related.


So this week it’s the biggest Earth Science meeting on the planet… There is a lot of great science that will be freely streamed via AGU On-Demand (registration required), and there’ll be a lot of commentary using the hashtag #AGU15. Many posters will be available online too. A few highlights have already been discussed by […]


Apparently there is a climate conference of some sort going on. Happy to answer any science questions as they arise…

Hiatus or Bye-atus?

Guest commentary by Stephan Lewandowsky, James Risbey and Naomi Oreskes The idea that global warming has “stopped” has long been a contrarian talking point. This framing has found entry into the scientific literature and there are now numerous articles that address a presumed recent “pause” or “hiatus” in global warming. Moreover, the “hiatus” also featured […]

Reports of our demise…

… have of course been greatly exaggerated. But we are having some issues with our domain name. The back story is perhaps interesting to others, so here is quick summary of the situation. Update: The account details have been restored and the domains renewed. We should be back to normal in a couple of days. […]

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