Global Warming

On the basis of current climate policy commitments and potential technology and market responses, my current best estimate for global warming is that average global temperatures by 2100 will rise to no more than 2.5 degrees Celsius above pre-industrial levels.

Responses weighted by each expert's confidence

Participant University Vote Confidence Bio/Vote History
Allen
Franklin Allen
Imperial College London
Uncertain
3
Bio/Vote History
It’s very difficult to make these long term predictions. However, I am more optmistic now than I used to be that this climate target may be met, given the great technological progress being made, particularly in solar cells.
Antras
Pol Antras
Harvard
Uncertain
1
Bio/Vote History
Blanchard
Olivier Blanchard
Peterson Institute
Uncertain
10
Bio/Vote History
I do not know enough even to have a guess. Technological progress is surprisingly fast. But political support and funding is, as would be expected, not sufficient. Which of these two forces will dominate, I just do not know.
Blundell
Richard William Blundell
University College London Did Not Answer Bio/Vote History
Botticini
Maristella Botticini
Bocconi
Uncertain
7
Bio/Vote History
Bénassy-Quéré
Agnès Bénassy-Quéré
Paris School of Economics
Agree
6
Bio/Vote History
+2.3°C according to NDC scenario of the NGFS Phase V, see p. 11 of link. Implementation is however highly uncertain.
-see background information here
Carletti
Elena Carletti
Bocconi Did Not Answer Bio/Vote History
Danthine
Jean-Pierre Danthine
Paris School of Economics
Agree
4
Bio/Vote History
We are not on the right track but forthcoming catastrophies will force the global community to act!
De Grauwe
Paul De Grauwe
LSE
Uncertain
5
Bio/Vote History
Eeckhout
Jan Eeckhout
UPF Barcelona
Uncertain
6
Bio/Vote History
Freixas
Xavier Freixas
Barcelona GSE Did Not Answer Bio/Vote History
Fuchs-Schündeln
Nicola Fuchs-Schündeln
Goethe-Universität Frankfurt
Uncertain
2
Bio/Vote History
It is very hard to predict the technological progress in this area, e.g. regarding carbon dioxide removal.
Galí
Jordi Galí
Barcelona GSE
Uncertain
2
Bio/Vote History
Garicano
Luis Garicano
LSE Did Not Answer Bio/Vote History
Gorodnichenko
Yuriy Gorodnichenko
Berkeley
Uncertain
2
Bio/Vote History
Griffith
Rachel Griffith
University of Manchester
No Opinion
Bio/Vote History
Guerrieri
Veronica Guerrieri
Chicago Booth
No Opinion
Bio/Vote History
Guiso
Luigi Guiso
Einaudi Institute for Economics and Finance
Agree
6
Bio/Vote History
Guriev
Sergei Guriev
Sciences Po
Uncertain
5
Bio/Vote History
Honohan
Patrick Honohan
Trinity College Dublin
Agree
1
Bio/Vote History
I’m optimistic on technology, and especially that a cascading adoption of significantly less carbon-intensive processes within the next few decades is plausible. Much uncertainty though, especially on the political dimension.
Javorcik
Beata Javorcik
University of Oxford
Uncertain
1
Bio/Vote History
Krahnen
Jan Pieter Krahnen
Goethe University Frankfurt
Uncertain
4
Bio/Vote History
The mood in many countries shifts away from giving climate concern high priority in policy agendas. On the other hand, climate sensitive investment strategies are increasingly popular among private agents. Taken together, necessary action happens, although speed is limited.
Kőszegi
Botond Kőszegi
Central European University
No Opinion
Bio/Vote History
La Ferrara
Eliana La Ferrara
Harvard Kennedy
Disagree
3
Bio/Vote History
Leuz
Christian Leuz
Chicago Booth
Agree
2
Bio/Vote History
Obviously estimate w/huge std error that requires reliance on climate science. My understanding (see link) is that much depends on whether ctries live up to pledges & NDCs (=2.1 C) or continue w/current policies & actions (=2.7 C). Also hope that Amara's Law is at play for tech
-see background information here
Mayer
Thierry Mayer
Sciences-Po
Uncertain
5
Bio/Vote History
Meghir
Costas Meghir
Yale Did Not Answer Bio/Vote History
Pagano
Marco Pagano
Università di Napoli Federico II
Strongly Disagree
8
Bio/Vote History
Pastor
Lubos Pastor
Chicago Booth
Disagree
9
Bio/Vote History
This is quite uncertain, but we are already almost 1.5 degrees above those levels. Given how long carbon persists in the atmosphere, and continued population growth in countries that cannot afford clean energy, it will take time for temperature to change its course.
Portes
Richard Portes
London Business School
Agree
4
Bio/Vote History
Prendergast
Canice Prendergast
Chicago Booth
Uncertain
4
Bio/Vote History
I'm uncertain as my best guess is just about 2.5 degrees, and it'll likely be close one side or the other.
Propper
Carol Propper
Imperial College London
No Opinion
Bio/Vote History
Rasul
Imran Rasul
University College London
Uncertain
6
Bio/Vote History
Reichlin
Lucrezia Reichlin
London Business School
Disagree
5
Bio/Vote History
Reis
Ricardo Reis
London School of Economics
Disagree
3
Bio/Vote History
From IPCC latest report:"The best estimates [and very likely ranges] for the different scenarios are: 1.4 [1.0 to 1.8 ]°C (SSP1-1.9); 1.8 [1.3 to 2.4]°C (SSP1-2.6); 2.7 [2.1 to 3.5]°C (SSP2-4.5); 3.6 [2.8 to 4.6]°C (SSP3-7.0); and 4.4 [3.3 to 5.7 ]°C (SSP5-8.5)." Very uncertain.
-see background information here
Repullo
Rafael Repullo
CEMFI
No Opinion
Bio/Vote History
Rey
Hélène Rey
London Business School
Disagree
6
Bio/Vote History
Schoar
Antoinette Schoar
MIT
Uncertain
8
Bio/Vote History
I believe the only hope for reducing/mitigating climate change is technological progress; societies seem unwilling to make drastic life style changes to reduce climate change. So the pace of warming depends on how quickly new technologies come online and how they are deployed.
Storesletten
Kjetil Storesletten
University of Minnesota
Uncertain
2
Bio/Vote History
Sturm
Daniel Sturm
London School of Economics
Disagree
6
Bio/Vote History
Tenreyro
Silvana Tenreyro
LSE
Uncertain
5
Bio/Vote History
Governments' commitment to fight climate change has waned in the past few years; unless they reverse course and efforts (and technologies) improve dramatically, we may drift away from the benign scenarios
-see background information here
Van der Ploeg
Rick Van der Ploeg
Oxford
Disagree
8
Bio/Vote History
I think it will go higher due to total lack of climate action
Vickers
John Vickers
Oxford
Uncertain
2
Bio/Vote History
Voth
Hans-Joachim Voth
University of Zurich
No Opinion
Bio/Vote History
predicting this far out is an exercise in futility; the data behind the CO2 hypothesis are all ill-fitting time series e-metrics and frankly insane models that no serious economist should put their faith in.
Whelan
Karl Whelan
University College Dublin
Disagree
5
Bio/Vote History
This is not at all my area of expertise but I understand the Paris agreement's goal of limiting warming to 2c is not likely to be achieved so I'm not sure why we would be confident that warming would be limited to 2.5c.
Wyplosz
Charles Wyplosz
The Graduate Institute Geneva
Uncertain
1
Bio/Vote History