Question A:
Voluntary national targets are unlikely to be an effective mechanism for achieving sharp reductions in greenhouse gas emissions.
Responses
Responses weighted by each expert's confidence
Question B:
Agreement on a significant global price floor for all carbon emissions would be an effective step towards achieving sharp reductions in emissions.
Responses
Responses weighted by each expert's confidence
Question C:
Green innovation in the private sector would be strongly stimulated by a substantial increase in public spending on R&D for climate change mitigation and adaptation.
Responses
Responses weighted by each expert's confidence
Question A Participant Responses
| Participant | University | Vote | Confidence | Bio/Vote History |
|---|---|---|---|---|
 Franklin Allen |
Imperial College London | Bio/Vote History | ||
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These voluntary targets are probably better than nothing. But it is not clear how effective they will be. Politics will be important.
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 Pol Antras |
Harvard | Bio/Vote History | ||
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 Oriana Bandiera |
London School of Economics | Did Not Answer | Bio/Vote History | |
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 Olivier Blanchard |
Peterson Institute | Bio/Vote History | ||
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question is unclear. voluntary by firms (will not work), voluntary by governments (will work a bit better)?
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 Nicholas Bloom |
Stanford | Bio/Vote History | ||
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Voters are often uninformed so can be tricked by politicians - for example Trump could ignore climate change by deceiving his supporters.
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 Richard William Blundell |
University College London | Did Not Answer | Bio/Vote History | |
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 Elena Carletti |
Bocconi | Did Not Answer | Bio/Vote History | |
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 Jean-Pierre Danthine |
Paris School of Economics | Bio/Vote History | ||
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 Paul De Grauwe |
LSE | Did Not Answer | Bio/Vote History | |
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 Jan Eeckhout |
UPF Barcelona | Bio/Vote History | ||
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 Ernst Fehr |
Universität Zurich | Bio/Vote History | ||
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 Xavier Freixas |
Barcelona GSE | Bio/Vote History | ||
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insuficient incentives given the governments short time horizons
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 Nicola Fuchs-Schündeln |
Goethe-Universität Frankfurt | Bio/Vote History | ||
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 Jordi Galí |
Barcelona GSE | Bio/Vote History | ||
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 Francesco Giavazzi |
Bocconi | Did Not Answer | Bio/Vote History | |
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 Rachel Griffith |
University of Manchester | Bio/Vote History | ||
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 Veronica Guerrieri |
Chicago Booth | Bio/Vote History | ||
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 Luigi Guiso |
Einaudi Institute for Economics and Finance | Bio/Vote History | ||
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 Sergei Guriev |
Sciences Po | Bio/Vote History | ||
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 Patrick Honohan |
Trinity College Dublin | Bio/Vote History | ||
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If US, EU and China voluntarily adopt policy and impose compensatory border taxes) effect could be as big as with binding global agreement.
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 Beata Javorcik |
University of Oxford | Bio/Vote History | ||
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 Jan Pieter Krahnen |
Goethe University Frankfurt | Bio/Vote History | ||
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Implemented rules of self-commitment may have an important role model effect, leading to spillovers to other countries.
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 Botond Kőszegi |
Central European University | Bio/Vote History | ||
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 Eliana La Ferrara |
Harvard Kennedy | Bio/Vote History | ||
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 Christian Leuz |
Chicago Booth | Bio/Vote History | ||
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 Thierry Mayer |
Sciences-Po | Did Not Answer | Bio/Vote History | |
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 Costas Meghir |
Yale | Bio/Vote History | ||
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 Marco Pagano |
Università di Napoli Federico II | Bio/Vote History | ||
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 Lubos Pastor |
Chicago Booth | Bio/Vote History | ||
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 Torsten Persson |
Stockholm University | Bio/Vote History | ||
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 Christopher Pissarides |
London School of Economics and Political Science | Did Not Answer | Bio/Vote History | |
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 Richard Portes |
London Business School | Bio/Vote History | ||
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 Canice Prendergast |
Chicago Booth | Bio/Vote History | ||
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 Carol Propper |
Imperial College London | Did Not Answer | Bio/Vote History | |
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 Imran Rasul |
University College London | Bio/Vote History | ||
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 Lucrezia Reichlin |
London Business School | Bio/Vote History | ||
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 Ricardo Reis |
London School of Economics | Bio/Vote History | ||
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We achieved significant reductions with mostly national policies adopted by rich countries. But tragedy of commons means likely too little
-see background information here |
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 Rafael Repullo |
CEMFI | Bio/Vote History | ||
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 Hélène Rey |
London Business School | Bio/Vote History | ||
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 Antoinette Schoar |
MIT | Did Not Answer | Bio/Vote History | |
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 Kjetil Storesletten |
University of Minnesota | Bio/Vote History | ||
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 Daniel Sturm |
London School of Economics | Bio/Vote History | ||
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 John Van Reenen |
LSE | Bio/Vote History | ||
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These decisions have some moral and political weight.
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 John Vickers |
Oxford | Bio/Vote History | ||
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 Hans-Joachim Voth |
University of Zurich | Bio/Vote History | ||
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 Karl Whelan |
University College Dublin | Did Not Answer | Bio/Vote History | |
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 Charles Wyplosz |
The Graduate Institute Geneva | Bio/Vote History | ||
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 Fabrizio Zilibotti |
Yale University | Bio/Vote History | ||
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Question B Participant Responses
| Participant | University | Vote | Confidence | Bio/Vote History |
|---|---|---|---|---|
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Franklin Allen |
Imperial College London | Bio/Vote History | ||
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I think it would help. The effectiveness will depend a lot on the details.
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Pol Antras |
Harvard | Bio/Vote History | ||
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Oriana Bandiera |
London School of Economics | Did Not Answer | Bio/Vote History | |
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Olivier Blanchard |
Peterson Institute | Bio/Vote History | ||
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Nicholas Bloom |
Stanford | Bio/Vote History | ||
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Richard William Blundell |
University College London | Did Not Answer | Bio/Vote History | |
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Elena Carletti |
Bocconi | Did Not Answer | Bio/Vote History | |
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Jean-Pierre Danthine |
Paris School of Economics | Bio/Vote History | ||
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Provided of course that the carbon price is not ridiculously low!
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Paul De Grauwe |
LSE | Did Not Answer | Bio/Vote History | |
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Jan Eeckhout |
UPF Barcelona | Bio/Vote History | ||
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Ernst Fehr |
Universität Zurich | Bio/Vote History | ||
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Xavier Freixas |
Barcelona GSE | Bio/Vote History | ||
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Nicola Fuchs-Schündeln |
Goethe-Universität Frankfurt | Bio/Vote History | ||
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Jordi Galí |
Barcelona GSE | Bio/Vote History | ||
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Francesco Giavazzi |
Bocconi | Did Not Answer | Bio/Vote History | |
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Rachel Griffith |
University of Manchester | Bio/Vote History | ||
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Veronica Guerrieri |
Chicago Booth | Bio/Vote History | ||
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Luigi Guiso |
Einaudi Institute for Economics and Finance | Bio/Vote History | ||
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Sergei Guriev |
Sciences Po | Bio/Vote History | ||
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Patrick Honohan |
Trinity College Dublin | Bio/Vote History | ||
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Needed in addition to selective measures targeted at particularly carbon-intensive sectors.
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Beata Javorcik |
University of Oxford | Bio/Vote History | ||
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Jan Pieter Krahnen |
Goethe University Frankfurt | Bio/Vote History | ||
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...that looks like a first-best outcome in a second best situation.
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Botond Kőszegi |
Central European University | Bio/Vote History | ||
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Eliana La Ferrara |
Harvard Kennedy | Bio/Vote History | ||
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Christian Leuz |
Chicago Booth | Bio/Vote History | ||
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A significant floor would not only provide incentives for reductions & innovations but also some policy certainty.
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Thierry Mayer |
Sciences-Po | Did Not Answer | Bio/Vote History | |
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Costas Meghir |
Yale | Bio/Vote History | ||
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Marco Pagano |
Università di Napoli Federico II | Bio/Vote History | ||
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Lubos Pastor |
Chicago Booth | Bio/Vote History | ||
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Torsten Persson |
Stockholm University | Bio/Vote History | ||
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Christopher Pissarides |
London School of Economics and Political Science | Did Not Answer | Bio/Vote History | |
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Richard Portes |
London Business School | Bio/Vote History | ||
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Canice Prendergast |
Chicago Booth | Bio/Vote History | ||
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Carol Propper |
Imperial College London | Did Not Answer | Bio/Vote History | |
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Imran Rasul |
University College London | Bio/Vote History | ||
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Lucrezia Reichlin |
London Business School | Bio/Vote History | ||
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Ricardo Reis |
London School of Economics | Bio/Vote History | ||
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Only if well designed. Countries have different market structures for trading/auctioning carbon, and reserve prices can backfire in some.
-see background information here |
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Rafael Repullo |
CEMFI | Bio/Vote History | ||
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Hélène Rey |
London Business School | Bio/Vote History | ||
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Antoinette Schoar |
MIT | Did Not Answer | Bio/Vote History | |
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Kjetil Storesletten |
University of Minnesota | Bio/Vote History | ||
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Experience from traded SO2 permits in 1980s showed emission reductions were surprisingly cheap if firms faced common price for emissions
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Daniel Sturm |
London School of Economics | Bio/Vote History | ||
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Great policy idea, but politically obviously really difficult to get agreement on.
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John Van Reenen |
LSE | Bio/Vote History | ||
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It would be great, but highly unlikley to be accomplished politically. That's why voluntary agreements are probably the only game in town
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John Vickers |
Oxford | Bio/Vote History | ||
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Hans-Joachim Voth |
University of Zurich | Bio/Vote History | ||
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Karl Whelan |
University College Dublin | Did Not Answer | Bio/Vote History | |
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Charles Wyplosz |
The Graduate Institute Geneva | Bio/Vote History | ||
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Fabrizio Zilibotti |
Yale University | Bio/Vote History | ||
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Question C Participant Responses
| Participant | University | Vote | Confidence | Bio/Vote History |
|---|---|---|---|---|
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Franklin Allen |
Imperial College London | Bio/Vote History | ||
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It could be if it is structured properly. Government programs seem to have played a role reducing the cost of renewables.
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Pol Antras |
Harvard | Bio/Vote History | ||
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Oriana Bandiera |
London School of Economics | Did Not Answer | Bio/Vote History | |
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Olivier Blanchard |
Peterson Institute | Bio/Vote History | ||
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Nicholas Bloom |
Stanford | Bio/Vote History | ||
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There is a large literature showing that R&D support increases R&D, see for example "A Toolkit of Policies to Promote Innovation"
-see background information here |
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Richard William Blundell |
University College London | Did Not Answer | Bio/Vote History | |
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Elena Carletti |
Bocconi | Did Not Answer | Bio/Vote History | |
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Jean-Pierre Danthine |
Paris School of Economics | Bio/Vote History | ||
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Paul De Grauwe |
LSE | Did Not Answer | Bio/Vote History | |
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Jan Eeckhout |
UPF Barcelona | Bio/Vote History | ||
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Ernst Fehr |
Universität Zurich | Bio/Vote History | ||
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Xavier Freixas |
Barcelona GSE | Bio/Vote History | ||
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Nicola Fuchs-Schündeln |
Goethe-Universität Frankfurt | Bio/Vote History | ||
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Jordi Galí |
Barcelona GSE | Bio/Vote History | ||
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Francesco Giavazzi |
Bocconi | Did Not Answer | Bio/Vote History | |
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Rachel Griffith |
University of Manchester | Bio/Vote History | ||
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Veronica Guerrieri |
Chicago Booth | Bio/Vote History | ||
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Luigi Guiso |
Einaudi Institute for Economics and Finance | Bio/Vote History | ||
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Sergei Guriev |
Sciences Po | Bio/Vote History | ||
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Patrick Honohan |
Trinity College Dublin | Bio/Vote History | ||
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Not clear whether these are complements or substitutes.
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Beata Javorcik |
University of Oxford | Bio/Vote History | ||
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Jan Pieter Krahnen |
Goethe University Frankfurt | Bio/Vote History | ||
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It all depends on how the spending program is implemented. More centralized investment decisions may lead to less effectiveness.
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Botond Kőszegi |
Central European University | Bio/Vote History | ||
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Eliana La Ferrara |
Harvard Kennedy | Bio/Vote History | ||
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Christian Leuz |
Chicago Booth | Bio/Vote History | ||
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Likely, given substantial policy & technological uncertainty on one hand. Prudent, given the urgency of the matter on the other hand
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Thierry Mayer |
Sciences-Po | Did Not Answer | Bio/Vote History | |
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Costas Meghir |
Yale | Bio/Vote History | ||
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Marco Pagano |
Università di Napoli Federico II | Bio/Vote History | ||
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Lubos Pastor |
Chicago Booth | Bio/Vote History | ||
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Torsten Persson |
Stockholm University | Bio/Vote History | ||
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Relative uncertainty is not associated with the qualitative claim, but the quantitative claim ("strongly")
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Christopher Pissarides |
London School of Economics and Political Science | Did Not Answer | Bio/Vote History | |
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Richard Portes |
London Business School | Bio/Vote History | ||
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Canice Prendergast |
Chicago Booth | Bio/Vote History | ||
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Carol Propper |
Imperial College London | Did Not Answer | Bio/Vote History | |
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Imran Rasul |
University College London | Bio/Vote History | ||
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Lucrezia Reichlin |
London Business School | Bio/Vote History | ||
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Ricardo Reis |
London School of Economics | Bio/Vote History | ||
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Public R&D spending tends to crowd in private R&D spending.
-see background information here |
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Rafael Repullo |
CEMFI | Bio/Vote History | ||
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Not clear that it will be "strongly" stimulated.
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Hélène Rey |
London Business School | Bio/Vote History | ||
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Antoinette Schoar |
MIT | Did Not Answer | Bio/Vote History | |
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Kjetil Storesletten |
University of Minnesota | Bio/Vote History | ||
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R&D subsidies would be effective at stimulating innovation. Especially if combined with high price of emissions
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Daniel Sturm |
London School of Economics | Bio/Vote History | ||
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John Van Reenen |
LSE | Bio/Vote History | ||
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Lots of evidence supports these policies; e.g. https://www.hamiltonproject.org/assets/files/JVR_PP_LO_6.15_FINAL.pdf webinar an
-see background information here |
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John Vickers |
Oxford | Bio/Vote History | ||
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Hans-Joachim Voth |
University of Zurich | Bio/Vote History | ||
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Karl Whelan |
University College Dublin | Did Not Answer | Bio/Vote History | |
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Charles Wyplosz |
The Graduate Institute Geneva | Bio/Vote History | ||
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Yes but there is big risk of capture.
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Fabrizio Zilibotti |
Yale University | Bio/Vote History | ||
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