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Christian Flachsland

@chflachsland.bsky.social
8.1K followers 3.5K following 399 posts

Professor of Climate Policy, Hertie School Centre for Sustainability

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Reposted by Christian Flachsland
Christian Traxler @chtraxler.bsky.social · 22/07/2026
In a new(ish) paper w/ Markus Gehrsitz ( @unistrathclyde.bsky.social) we study how vehicle taxation shapes 🚗 fleet exit. @cesifo.org Working Paper👉 ideas.repec.org/p/ces/ceswps... Thread👇 (1/5)
Cover Page
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Christian Traxler @chtraxler.bsky.social · 22/07/2026
Our daily data reveal sharp spikes in fleet exits at the 1st and 3rd registration anniversaries - typical lease endpoints, when many returned cars appear to be exported. Decomposition analysis suggests that exports (rather than scrappage/retirement) are the main driver of fleet exit.
Hazard RatesCumulative de-registration rates
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Christian Traxler @chtraxler.bsky.social · 22/07/2026
Many more details and robustness checks in the paper: ideas.repec.org/p/ces/ceswps... Thx for comments @dforemny.bsky.social @dcerruti.bsky.social ! FYI @hertiesecurity.bsky.social @joarlinghaus.bsky.social @hertiesustain.bsky.social @chflachsland.bsky.social
ideas.repec.org
The Effect of Vehicle Taxes on Fleet Exit
This paper studies how vehicle taxation shapes fleet exit. We exploit Germany's 2008/9 circulation tax reform, which generated a sharp discontinuity in annual tax liabilities at a registration cutoff
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Marian Feist @mjfeist.bsky.social · 16/04/2026
New op-ed in @globalpolicy.bsky.social: The genesis of the G7 #climateclub offers lessons for cooperation outside of the UN. www.globalpolicyjournal.com/blog/15/04/2...
globalpolicyjournal.com
The Club that Wasn’t
The genesis of the G7 climate club offers lessons for cooperation outside of the United Nations. Negotiating the international response to climate change has always been a slow and arduous process. Sh...
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Jacob Edenhofer @jacobedenhofer.bsky.social · 20/02/2026
Very happy to share this thoroughly revised version of our climate institutions working paper -- always a joy to work with @claudiazwar.bsky.social and @chflachsland.bsky.social. Thank you to everyone who provided feedback on the previous version! osf.io/preprints/so...
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Kopernikus-Projekt Ariadne @ariadneprojekt.bsky.social · 08/01/2026
𝗔𝗿𝗶𝗮𝗱𝗻𝗲 𝗶𝗻𝘀𝗶𝗱𝗲 👀 Bei der #Ariadne-Interviewreihe 2025 haben wir eine Menge über die Arbeitspakete gelernt. Die #statements der Forschenden zur Energiewende nehmen wir mit ins neue Jahr! 🎙️ @nworbmot.bsky.social @mkalkuhl.bsky.social @chflachsland.bsky.social @falkoueckerdt.bsky.social
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Jan Christoph Steckel @jansteckel.bsky.social · 10/11/2025
🚨Job Alert 🚨 Interested in working with us @pik-potsdam.bsky.social (Berlin based RD5, formerly MCC)? We are looking for a new #PhD student in my team, working on #policyevaluation, #politicaleconomy and #development. 3 years funded. Focus on research. No teaching obligations. More information 👇
potsdam.pi-asp.de/bewerber-web/?xsrf=8A7EDA763340E1F39D4664EC5F04C1C7&company=PIK-FIRMA-ID&tenant=&lang=E&jobdesign=#position,id=b991f59f-bef7-4bf6-925c-f61cd2310a56,popup=y
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Omar Wasow @owasow.bsky.social · 02/11/2025
“Can political activism foster electoral participation?” Study examines “1913 Pilgrimage, a large-scale nationwide march in support of women’s suffrage.” Finds “women’s activism can drive political participation even in the virtual absence of women politicians.” www.cambridge.org/core/journal...
Activism and the Electoral Participation of Women
Mona Morgan-Collins
 and
Valeria Rueda

Abstract

Can political activism foster electoral participation? We investigate this question by examining the role of the British suffragists in fostering women’s electoral participation. While scholars have shown that women politicians increase women’s participation in politics, less attention has been paid to the role of activists. We fill this gap by studying the 1913 Pilgrimage, a large-scale nationwide march in support of women’s parliamentary suffrage. Using a novel database of geocoded electoral registers, we employ a differences-in-differences strategy to show that proximity to the Pilgrimage increased women’s registration in local elections. To explain this effect, we show that exposure to women activists spurred other women’s political mobilization, and that our results are not driven by an endogenous selection of the march path and cannot be attributed to mobilization by other movements or politicians. Our findings highlight that women’s activism can drive political participation even in the virtual absence of women politicians.
Figure 2. Map of the march and data availability at the division level.
Note: March path in sampled counties is along main roads connecting stopping points and along straight lines outside the sample (see Appendix Figure C.1 for stopping points).Figure 3. The effects of the march using different treatment definitions.
Note: Plots the coefficient of interest β, defined using different distance buffers; ninety per cent and ninety-five per cent CIs; standard errors clustered at the parliamentary division level, using Model 2 in Table 3
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Robbie Andrew @robbieandrew.bsky.social · 18/10/2025
One of the most dramatic "blips" at a global level, ever. robbieandrew.github.io/internationa...
Graph showing: Monthly global air passengers
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Jacob Edenhofer @jacobedenhofer.bsky.social · 07/10/2025
Some thoughts on the strategic logic behind Kemi Badenoch’s announcement that she’d scrap the Climate Change Act (CCA). It serves two functions: 1️⃣ It appeals to lukewarm pivotal voters in marginal seats sceptical of costly green measures. 2️⃣ It is designed to www.theguardian.com/environment/...
theguardian.com
Kemi Badenoch vows to repeal Climate Change Act
Tory leader says she would replace it with ‘cheap energy’ strategy, ending decades-long consensus on climate
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Christian Flachsland @chflachsland.bsky.social · 07/10/2025
"A growing number of studies have found that the most widely used offset programs continue to greatly overestimate their probable climate impact often by a factor of five to ten or more. " www.annualreviews.org/content/jour...
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Wahlrecht.de @wahlrecht.de · 25/09/2025
Sonntagsfrage zur Landtagswahl in Mecklenburg-Vorpommern • Infratest dimap / NDR: AfD 38 % | SPD 19 % | CDU 13 % | DIE LINKE 12 % | BSW 7 % | GRÜNE 5 % | Sonstige 6 % ➤ Verlauf: wahlrecht.de/umfragen/lan... 🗓️ Landtagswahl: 20. September 2026 #ltwmv
Säulendiagramm der Sonntagsfrage zur Landtagswahl in Mecklenburg-Vorpommern von Infratest dimap für den NDR
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Christian Flachsland @chflachsland.bsky.social · 22/09/2025
Update of perhaps my favorite global climate policy indicator: The production gap report. In fact, the gap between countries' planned fossil fuel extraction and global climate targets has widened. Turning the tide on these indicators is essential for climate policy success. productiongap.org
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Christian Flachsland @chflachsland.bsky.social · 22/09/2025
Update of perhaps my favorite global climate policy indicator: The production gap report. In fact, the gap between countries' planned fossil fuel extraction and global climate targets has widened. Turning the tide on these indicators is essential for climate policy success. productiongap.org
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Tom Nuttall @tomnuttall.bsky.social · 22/09/2025
For the first time the AfD has nudged ahead of the Union in this national polling aggregator, perhaps Germany's most reliable. Beware cope about the AfD losing this or that mayoral election, including in NRW this coming weekend. Something important is shifting.
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IPCC @ipcc.bsky.social · 19/09/2025
Registration for experts interested in serving as Expert Reviewers and providing scientific comments on the First Order Draft of the Special Report on Climate Change and Cities is now open! Register here: apps.ipcc.ch/comments/src... ⚠️ Registration closes 30 Nov2025 🔗 www.ipcc.ch/2025/09/17/p...
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Claudia Zwar @claudiazwar.bsky.social · 18/09/2025
This has been a tumultuous week in Australian climate politics! And a good example of how target setting becomes a focal point for agenda-setting on climate, as per @jacobedenhofer.bsky.social, @chflachsland.bsky.social and my paper (below) www.theguardian.com/australia-ne...
theguardian.com
Bowen says cutting emissions by more than 70% ‘not achievable’ as 2035 target criticised from all sides
Albanese says 62% to 70% range represents ‘the sweet spot’ as Coalition rejects ‘economy wrecking’ target while Greens label it a ‘betrayal’
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Christian Flachsland @chflachsland.bsky.social · 18/09/2025
Welcome to the Hertie School @climatemorgan.bsky.social!
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Hertie School @hertieschool.bsky.social · 18/09/2025
We're excited to welcome Jennifer Morgan as a new Fellow at the Hertie School! 🌍 She'll bring her global climate policy expertise to our teaching and research, working closely with the Centre for Sustainability.
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Adam Przeworski @adamprz.bsky.social · 14/09/2025
Exceptionally informative.
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Theodore Tallent @theodoretallent.bsky.social · 09/09/2025
A new chapter starts today ✨️ As I'll be completing my PhD this year, I just started a new position at the @hertieschool.bsky.social as a Research Associate at their Centre for Sustainability. An exciting year between Paris and Berlin, from the end of the PhD to the beginning of something new 🙌
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Marian Feist @mjfeist.bsky.social · 27/08/2025
Previously headed by the foreign office, Germany’s #climatediplomacy is now consolidated at the environment ministry again. But some things have survived the recent change of government. (1/2) www.bundesumweltministerium.de/pressemittei...
bundesumweltministerium.de
Internationale Klimapolitik: Zuständigkeit wechselt, gemeinsames Engagement bleibt- BMUKN - Pressemitteilung
Die Bundesregierung stellt die internationale Klimapolitik neu auf. Die Federführung wechselt vom Auswärtigem Amt zum Bundesumweltministerium (BMUKN). Dort wird eine neue Abteilung für internationale ...
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Malte Kreutzfeldt @mkreutzfeldt.bsky.social · 21/08/2025
Im "Anti-Klima-Tracker", einer neuen Webseite, die letzte Woche online ging, kritisieren die Grünen klimapolitische Entscheidungen der Bundesregierung. Doch einige der dort gemachten Aussagen sind irreführend oder unzutreffend. Dazu ein Faktencheck: (1/12) www.gruene.de/politik-fuer...
Text: 
Anti-Klima-Tracker
Wir schauen dieser neuen Bundesregierung Merz mit unserem Anti-Klima-Tracker kritisch auf die Finger! In Regierungsverantwortung haben wir GRÜNE in den letzten Jahren einen Klima- und Transformationsfonds entwickelt, der wichtige Vorhaben für mehr Klimaschutz – und damit mehr Schutz für uns alle vor den schlimmsten Folgen der Klimakrise – in Deutschland angestoßen hat. Die Regierung Merz hätte die Möglichkeit, diese Erfolge auszubauen. Doch statt den Klimafonds für echten Fortschritt zu nutzen, wird er nun als „Verschiebebahnhof“ für ohnehin geplante Projekte aus dem Bundeshaushalt missbraucht. Erfolgreiche Programme zur klimaneutralen Modernisierung werden ausgebremst und Mittel stattdessen in die Subvention klimaschädlicher Geschäftsmodelle oder zweifelhafte Schaufensterprojekte umgeleitet – mit massiven Rückschritten beim Klimaschutz als Folge. Nur wenige Maßnahmen im Klima- und Transformationsfonds 2026 lassen noch Hoffnung auf echten Klimaschutz erkennen.
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Hertie School @hertieschool.bsky.social · 27/05/2025
Henrik Enderlein, former President of the Hertie School and founding Director of the @delorsberlin.bsky.social‬, passed away four years ago today at the age of 46. We remember Henrik as a visionary leader, professor, teacher and mentor. Our thoughts remain with Henrik's family and friends today.
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Christian Flachsland @chflachsland.bsky.social · 19/08/2025
Very excited to join AR7 WGIII as Lead Author in Chapter 6 'Enablers & Barriers'.
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Glen Peters @glenpeters.bsky.social · 15/08/2025
As of August, do we know what fossil CO2 emissions will do in 2025? I made an estimate in July, using IEA projections of fossil fuel use, to estimate 0.8% growth in 2025. Carbon Monitor has an estimate based on Jan-Jun data, 0.7%. But what about countries? www.eenews.net/articles/in-... 1/
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Kobi Hackenburg @kobihackenburg.bsky.social · 21/07/2025
Today (w/ @ox.ac.uk @stanford @MIT @LSE) we’re sharing the results of the largest AI persuasion experiments to date: 76k participants, 19  LLMs, 707 political issues. We examine “levers” of AI persuasion: model scale, post-training, prompting, personalization, & more!  🧵:
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Jacob Edenhofer @jacobedenhofer.bsky.social · 19/07/2025
The paper might sound nerdy, but it makes a broader point that I hope (political) economists take more seriously: institutions are not always constraints (though macro-level ones often are), sometimes they are choice variables for policymakers whose main purpose is not to directly influence
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Will Lowe @conjugateprior.org · 19/07/2025
As next to nobody understands elasticity of demand, I propose calling increased car use from building an extra lane 'the Jevons effect', and increased biking from building bike infrastructure 'the Hidalgo effect'. They differ only in whether we like the outcome, but hey, that's how all this works.
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Christian Flachsland @chflachsland.bsky.social · 19/07/2025
Working paper update 👇
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Christian Flachsland @chflachsland.bsky.social · 19/07/2025
Working paper update 👇
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Claudia Zwar @claudiazwar.bsky.social · 18/07/2025
Our updated working paper with @jacobedenhofer.bsky.social and @chflachsland.bsky.social - Introducing and applying the Climate Institutions Analysis Framework (CIAF) - is now available ⬇️ all feedback welcome!
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SocArXivBot @socarxivbot.bsky.social · 18/07/2025
Introducing and applying the Climate Institutions Analysis Framework (CIAF): A comparative analysis of climate institutions in Germany, the United Kingdom, Sweden, and Australia using the CIAF: osf.io/jf8ah
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Christian Flachsland @chflachsland.bsky.social · 17/07/2025
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SocArXivBot @socarxivbot.bsky.social · 17/07/2025
Unrequited Love: Estimating the Electoral Effect of a Place-based Green Subsidy with a 2D Regression Discontinuity Design: osf.io/s4nje
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Michael Liebreich @mliebreich.bsky.social · 16/07/2025
Climate change is a by-product of progress in the same way as obesity is a by-product of nutrition. For goodness sakes, it's the 21st century! We have the technology to enjoy progress without trashing the planet.
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Lucas Guttenberg @lucasguttenberg.bsky.social · 16/07/2025
Much more sweeping is the change that the COM has just proposed a massive shift in the shares in the budget away from regional and agricultural policy towards common spending on things like decarbonisation or innovation. This is an important step to match the EU budget and proclaimed EU priorities.
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Vicente Valentim @valentimvicente.bsky.social · 16/07/2025
The Portuguese far right party CH has been growing spectacularly, shattering views of the country as immune to this phenomenon. This has prompted a discussion about where their votes come from. Some thoughts on this, prompted by newly released survey data:
Plot with the evolution of vote share for CH: 
1.3% to 7.28 % to 18.06% to 22.08%
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David Karpa @dkarpa.bsky.social · 15/07/2025
"find a strong relationship between mobility and support for the far right across 11 European countries. [...] demonstrate an asymmetry: while downward mobility predicts increased far-right voting, upward mobility has little effect." journals.sagepub.com/doi/epub/10....
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John Schwartz @jswatz.bsky.social · 12/07/2025
“Without the office in place, there’s not a focal point for the organization of U.S. climate diplomacy, but that seems to be the point, right? To not have the U.S. engaging in climate diplomacy seems to be the policy goal of the administration,” Meyer said. www.washingtonpost.com/climate-envi...
washingtonpost.com
The State Department fires remaining employees who worked on climate change
The firings of nearly a dozen people in the State Department’s Office of Global Change include the last U.S. climate negotiators.
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David Ho @davidho.bsky.social · 11/07/2025
This figure from the article illustrates that the low adoption of air conditioning in European cities results in much higher heat-related mortality during extreme heatwaves compared to American cities, where air conditioning is more widespread.
a multi-panel line chart titled "Low adoption of air conditioning means Europe’s death rates climb far more steeply than America’s during periods of intense heat". The chart compares the relative increase in mortality risk at different outdoor temperatures between paired European and American cities. The general finding is that European cities (shown in red) experience a much steeper rise in death rates during high temperatures compared to American cities (shown in blue).

Each mini-chart within the graphic compares a European city to a U.S. city with a similar climate profile (based on the number of days exceeding 28°C/82°F annually). The y-axis in each panel represents relative mortality risk (%), ranging from 0% to 150%. The x-axis represents temperature in degrees Celsius (with corresponding Fahrenheit values labeled in the first and last rows), ranging approximately from 0°C to 35°C.

Here are some examples of each city pairing, displayed in a 3x4 grid:

Athens vs Atlanta GA

Athens (red) shows a sharp rise in mortality above 30°C

Atlanta (blue) shows a slight rise

Barcelona vs Los Angeles CA

Barcelona (red) rises steeply above 30°C

Los Angeles (blue) shows little change

Frankfurt vs Boston MA

Frankfurt (red) sharply increases above 25°C

Boston (blue) stays mostly flat

Lisbon vs San Jose CA

Lisbon (red) increases above 25°C

San Jose (blue) shows no steep rise

London vs Portland OR

London (red) has a strong upward curve above 25°C

Portland (blue) remains steady

etc.

Red and blue shaded areas around the lines indicate uncertainty or confidence intervals.

The red lines (Europe) almost always curve upwards more steeply than the blue lines (U.S.), especially past the 25–30°C mark.

Sources:

Adapted from Chen et al., 2004

Created by FT graphic designer John Burn-Murdoch (@jburnmurdoch)

Notes that city pairings are based on similarity in days exceeding 28°C/82°F annually.
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Heike Klüver @heikekluever.bsky.social · 09/07/2025
📣 Call for Applications 📣 3-year Postdoc position in Berlin 🚀 Join our Comparative Political Behavior Group at @humboldtuni.bsky.social & the @humboldt-govlab.bsky.social Great people, great projects, great city – come work with us! 🗓️ Deadline: 31 July 2025
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Christian Flachsland @chflachsland.bsky.social · 09/07/2025
Must-read for all EU climate politics nerds: @ziaweise.bsky.social with an update on the nuances of the unfolding parliamentarian political battle over the new EU 2040 target.
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Michael Bloss @michabloss.bsky.social · 09/07/2025
Gestern haben die Konservativen zugelassen, dass die Rolle des Berichterstatters für das wichtigste Klimagesetz dieser Legislaturperiode an die Patriots for Europe geht - eine rechtsextreme Fraktion, zu der z.B. die österreichische FPÖ und der französische Rassemblement National um Le Pen gehört.
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Neale Mahoney @nealemahoney.bsky.social · 08/07/2025
This is unethical, but tempted to include white text telling an AI reviewer to reveal itself in my next submission asia.nikkei.com/Business/Tec...
asia.nikkei.com
'Positive review only': Researchers hide AI prompts in papers
Instructions in preprints from 14 universities highlight controversy on AI in peer review
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Leonhard Gandhi @energy-charts.bsky.social · 04/07/2025
Im ersten Halbjahr 2025 war Wind die stärkste Stromquelle in Deutschland. Solar hat erstmals die Braunkohle überholt und ist auf Platz zwei gelandet. Weitere spannende Grafiken gibt es in unserer Halbjahresauswertung 2025. www.energy-charts.info/downloads/St...
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Zia Weise @ziaweise.bsky.social · 04/07/2025
For the first time, solar produced more electricity than lignite in Germany for the first half of the year. 60% of power generation was renewable.
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Zia Weise @ziaweise.bsky.social · 04/07/2025
Germany has become one of the EU's top solar producers — below map showing % of solar in generation this year so far.
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Zia Weise @ziaweise.bsky.social · 04/07/2025
And here's the share of renewables in power generation across the EU for 2025 to date. All from the excellent www.energy-charts.info
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Nicolas Schmid @nicolasschmid.bsky.social · 01/07/2025
great read! other work that may be relevant for you: www.sciencedirect.com/science/arti... also onlinelibrary.wiley.com/doi/full/10.... or www.sciencedirect.com/science/arti... or an upcoming paper in BJPS: osf.io/bq356_v4
sciencedirect.com
Elite vs. mass politics of sustainability transitions
While the past decade of transitions scholarship has increasingly acknowledged the centrality of politics, key questions on transition politics deserv…
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