Our News
“New pathways explored”: Closing event for the Ariadne energy transition project
The Ariadne research project has provided important guidance for the energy transition in Germany since its inceptions in mid-2019, and will leave well-founded recommendations for its further orientation when it closes at the end of 2026. This is the …
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Europe & Green Deal
EU climate policy caught between emissions reduction, competitiveness and investment security
In a background paper, Ariadne researchers summarise how governance, financing, industrial transformation, the EU Emissions Trading Scheme and energy infrastructure need to simultaneously ensure decarbonisation, economic resilience and public support.
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Europe & Green Deal
Ariadne@Brussels 2025: Insights into the conference ‘EU climate and energy policy in a polarising world’
This years iteration of the Ariadne@Brussels workshop series took place in Brussels EU Quarter from 8 to 10 December 2025. Researchers from the Ariadne project presented their latest findings on EU climate and energy policy and discussed them in …
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Europe & Green Deal, Industrial transition
CO2 pricing and subsidies alone are insufficient: Create lead markets for industrial transformation
In a new analysis, Ariadne researchers propose instruments to create lead markets for the emission-intensive basic materials cement, steel and ethylene.
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Europe & Green Deal, Transport transition
Role of hybrid vehicles in EU fleet mix questionable: very high CO2 emissions
A real-world consumption data from around 850,000 vehicles across Europe shows that PHEVs are rarely charged, the combustion engine is used too often, and even in mainly electric mode, fuel consumption is considerable.
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Paths to climate neutrality
Gabriele Tirelli / Unsplash Transport transition
Heliberto Arias / Unsplash Electricity transition
Federico-Beccari / Unsplash Heating transition
Julian Hochgesang on Unsplash Industrial transition
Maxim Tolchinskiy on Unsplash Hydrogen
Peter Schreiber / Shutterstock Tax reform
StellrWeb on Unsplash Governance
Moritz Lüdtke / Unsplash Europa & Green Deal
Christian Lue / Unsplash 
Publications
Dossier: Challenges and priorities for Germany’s climate diplomacy
Efforts by Germany and the European Union to advance climate mitigation internationally are under pressure. Domestic political priorities have shifted, international tensions and conflicts have increased, conventional approaches to international climate cooperation have reached a roadblock. At the same …
Background: Advancing EU competitiveness through a more effective climate transition
As the European Union designs its post-2030 architecture, it needs a governance framework that preserves the credibility of the climate-neutrality pathway while supporting competitiveness, simplification, and investor certainty. The 2040 target provides an important anchor for this framework, but …
Dossier: A Safety Valve for the EU ETS Endgame – Containing Prices through Carbon Dioxide Removal
A major question for the upcoming review of the EU Emission Trading System (ETS) is how to contain costs while ensuring that green investments, specifically in energy-intensive industries, are not choked off. A key concern for both is the …
Analysis: Lead markets for the industrial transformation – Implementation proposals for instruments to increase demand for climate-friendly basic materials (Summary)
Lead markets, in which climate-friendly basic materials are purchased despite higher costs due to their product property, can complement the existing policy mix for a competitive and climate-neutral industry.
Analysis: Real-world Fuel Consumption and Potential Future Regulation of Plug-In Hybrid Electric Vehicles in Europe – An Empirical Analysis of about one Million Vehicles
Actual real-world fuel consumption of Plug-In Hybrid Electric Vehicle (PHEV) in Europe slightly increased to around 6.0 to 6.2 l/100 km between the registration years 2021 and 2023 for both gasoline and diesel PHEVs. At the same time, type-approval fuel …
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