Site: Bart Verheggen

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Bart Verheggen: A critical look at “The uncertainty has settled” documentary by Marijn Poels

(Zie de Nederlandse versie door Jos Hagelaars op ons Klimaatverandering blog) The documentary “The uncertainty has settled” from Dutch filmmaker Marijn Poels follows him on his journey in rural Austria and Germany to witness how energy policies impact traditional agriculture. That is the stepping stone to also look into different ideas about how and why

2017-07-17 10:39   Click to comment

Bart Verheggen: I’ll march for science, because the truth and the pursuit of truth matters. A lot.

This saturday 22 April a global March for Science will take place in around 500 hundred cities worldwide. I’ll take part in the Amsterdam March for Science, taking place between 12:00 and 16:00 on Museumplein. You can find me in the “discovery” tent with some posters about climate change and sustainable energy. Science and rational

2017-04-20 21:18   Click to comment

Bart Verheggen: Earth’s temperature over the past two million years

A new reconstruction of global average temperature over the past two million years has recently appeared in Nature (Snyder, 2016). That is quite a feat and a first for this duration. The figure below, made by Jos Hagelaars, shows Snyder’s temperature reconstruction, combined with the observed warming since 1880 and projected warming until the year

2016-10-06 21:38   Click to comment

Bart Verheggen: Climate inertia

Imagine you’re on a supertanker that needs to change its direction in order to avoid a collision. What would you do? Would you continue going full steam ahead until you can see the collision object right in front of you? Or would you try to change course early, knowing that changing a supertanker’s course takes

2016-08-09 15:05   Click to comment

Bart Verheggen: New survey of climate scientists by Bray and von Storch confirms broad consensus on human causation

Bray and von Storch just published the results of their latest survey of climate scientists. It contains lots of interesting and very detailed information, though some questions are a little biased in my opinion. Still, they find a strong consensus on human causation of climate change: 87.4% of respondents are to some extent convinced that

2016-06-22 16:57   Click to comment

Bart Verheggen: Consensus on consensus: a synthesis of consensus estimates on human-caused global warming

Most scientists agree that current climate change is mainly caused by human activity. That has been repeatedly demonstrated on the basis of surveys of the scientific opinion as well as surveys of the scientific literature. In an article published today in the journal Environmental Research Letters (ERL) we provide a review of these different studies,

2016-04-13 01:02   Click to comment

Bart Verheggen: Antarctica: ice gain or loss?

Guest post by Dr. Jan Wuite, Enveo, Innsbruck A new study released by NASA scientist Jay Zwally and colleagues in the Journal of Glaciology, receiving wide coverage in the media last month, reports an 82 Gigatons per year increase of land ice in Antarctica during the period 2003-2008. The study received much skepticism from other

2015-11-25 20:01   Click to comment

Bart Verheggen: From complex clarity to nuanced misunderstanding: Response to Hollin and Pearce

Earlier this year, Greg Hollin and Warren Pearce published a short letter in Nature Climate Change entitled Tension between scientific certainty and meaning complicates communication of IPCC reports. In contrast to their claims, we demonstrate in our comment on this article that the IPCC correctly placed the hottest decade in the context of long-term trends.

2015-10-24 08:30   Click to comment

Bart Verheggen: Wanted: blog readers to be interviewed as part of PhD research into climate blogging

Guest post by Giorgos Zoukas. As part of his research on climate blogging he would like to interview blog readers. Please contact him if you’d like to participate. He has interviewed me as well as some other climate scientist bloggers. BV   Invitation to participate in a PhD research project on climate blogging My name

2015-10-10 20:07   Click to comment

Bart Verheggen: Richard Tol misrepresents consensus studies in order to falsely paint John Cook’s 97% as an outlier

John Cook warned me: if you attempt to quantify the level of scientific consensus on climate change, you will be fiercely criticized. Most of the counterarguments don’t stand up to scrutiny however. And so it happened. The latest in this saga is a comment that Richard Tol submitted to ERL, as a response to John

2015-09-24 07:50   Click to comment

Bart Verheggen: Rick Santorum misrepresents our climate survey results on Bill Maher show

In our survey of more than 1800 scientists we found that the large majority agree that recent climate change is predominantly human induced. The article where we discuss our results is publicly available and a brief rundown of the main conclusions is provided in this blogpost. We were quite surprised to hear a US Presidential

2015-09-02 20:54   Click to comment

Bart Verheggen: A warm 2015 and model –data comparisons

Guest post by Jos Hagelaars. Dutch version is here. Discussions on the Internet regarding climate change are sometimes about scientific details, sometimes about the climate sensitivity regarding the equilibrium situation hundreds of years from now, but the most prevalent discussion topic is probably: the global average temperature. Will it get warmer or colder, is there

2015-08-07 20:58   Click to comment

Bart Verheggen: PBL survey shows strong scientific consensus that global warming is largely driven by greenhouse gases

As Michael Tobis rightly points out, the level of scientific consensus that you find “depends crucially on who you include as a scientist, what question you are asking, and how you go about asking it”. And on how you interpret the data. We argued that our survey results show a strong scientific consensus that global

2015-08-04 15:31   Click to comment

Bart Verheggen: Responses to the Climate Science Survey

Appeared in similar form on the PBL website In the Spring of 2012, the Netherlands Environmental Assessment Agency PBL held a survey among 1868 scientists studying various aspects of climate change, including physical climate, climate impacts, and mitigation. The main results of the survey were published in an article in Environmental Science and Technology (ES&T)

2015-04-12 21:03   Click to comment

Bart Verheggen: Climate researcher Bart Strengers wins wager with climate sceptic Hans Labohm

Guestpost by Bart Strengers. Originally appeared as a news item on the PBL website. Late 2009, in the run-up to the international climate conference in Copenhagen, PBL climate researcher Bart Strengers had an online discussion with climate sceptic Hans Labohm on the website of the Dutch news station NOS (in Dutch). This discussion, which was

2015-01-23 10:05   Click to comment

Bart Verheggen: Open thread – Winter 2014/2015

For any climate related discussion – please be civil and minimize repeating yourself. It’s okay to agree to disagree.

2014-12-03 13:56   Click to comment

Bart Verheggen: Video-interview about climate science survey paper

Fellow Dutchman Collin Maessen interviewed me via skype about our recent paper “Scientists’ views about attribution of global warming“: Collin wrote a blogpost about it as well which is well worth a read, giving a bit of context from other opinion and literature surveys. The interview starts off with the general findings regarding the level

2014-09-26 21:05   Click to comment

Bart Verheggen: FAQ for the article “Scientists’ Views about Attribution of Global Warming”

published in Environmental Science and Technology (open access), DOI: 10.1021/es501998e, Supporting Information here. A formal version of the FAQ is also available at the website of the PBL Netherlands Environmental Assessment Agency. A blog post with a brief description of the main conclusions is here.   General 1. What are the objectives of this survey?

2014-08-11 13:16   Click to comment

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