Executive Summary
CO₂ emissions from heating fuels (heating oil, gas) fell by 5 percent in 2025, while transport fuel emissions (petrol, diesel) declined by only 1 percent. The main drivers of fuel reduction are improved building insulation and increased use of renewable heating energy such as heat pumps. For transport fuels, the growing supply of electric vehicles and biofuels is having an effect. The Federal Office for the Environment (BAFU) captures this development through annual CO₂ statistics, which mathematically adjust for weather effects.
Persons
- Federal Office for the Environment (BAFU) (Swiss authority, statistics collector)
Topics
- Swiss climate policy
- Energy transition
- Emissions reduction
- Renewable energy
Clarus Lead
Switzerland is making significant progress in heating, but falling short of reduction targets in transport. While fuel emissions have fallen by 46 percent since 1990, the transport sector is stagnating with only 8 percent reduction over 35 years. The sluggish transport fuel reduction reveals a structural problem: electromobility and biofuels (2025: 5.3% share) have not yet compensated for the growth in vehicle traffic. This shortfall will be relevant for bilateral negotiations with the EU (Bilateral III), as Brussels is demanding stricter transport emission targets.
Detailed Summary
BAFU's CO₂ statistics document two divergent trends. In the building sector, decarbonization is accelerating through targeted use of heat pumps and district heating networks; the weather-adjusted reduction of 5 percent year-on-year is therefore conservatively estimated. Compared to the baseline year 1990, the long-term effect is evident: minus 46 percent fuel emissions underscore the effectiveness of building renovation standards.
The transport sector, by contrast, is structurally stagnating. Despite growth in electric vehicles and biofuels (whose share exceeded the 5 percent mark for the first time in 2025), total emissions are declining by only 1 percent annually. Since 1990, the overall reduction amounts to just 8 percent – an indicator of the limited effect of technological substitution without traffic shifting or mobility reduction.
Weather adjustment is methodologically central: it normalizes heating energy fluctuations to average winter conditions (heating degree days, solar radiation) to ensure year-on-year comparability. Without this adjustment, cold winters would distort emissions trends.
Key Findings
- Fuel emissions fall by 5 percent in 2025, driven by building insulation and renewable heating
- Transport fuel emissions stagnate with only 1 percent reduction; long-term trend since 1990 is just 8 percent
- Biofuels exceed 5 percent market share for the first time in 2025, but are insufficient to reverse transport emissions
Critical Questions
Data Quality: How is the share of biogenic fuels measured and validated? Are there distinctions according to sustainability standards (ILUC risks)?
Heating Causality: Are the 5 percent reduction in fuel emissions explained solely by efficiency gains, or do demand declines (economic situation, population migration) play a role?
Transport Trend: Why is transport fuel reduction stagnating despite growth in electromobility? Is vehicle traffic volume (driving performance) taken into account in the statistics?
Weather Adjustment Robustness: How sensitive are the results to changes in the weather adjustment methodology? Are deviations from the BFE method documented?
EU Conformity: Do these measurement methods comply with EU emissions trading and effort-sharing requirements for comparable reporting?
Future Scenario: Are the reduction rates achieved so far sufficient to meet Switzerland's net-zero-2050 targets, particularly in transport?
Source Directory
Primary Source: [Switzerland-EU Package (Bilateral III) – CO₂ Emissions 2025] – https://www.news.admin.ch/de/newnsb/C5vI9QXhkcSH_g73pvmPe
Supplementary Sources:
- BAFU: CO₂ Statistics – https://www.bafu.admin.ch/de/co2-statistik
- Federal Office of Energy (BFE): Overall Energy Statistics
Verification Status: ✓ 13.07.2026
This text was created with the support of an AI model. Editorial responsibility: clarus.news | Fact-check: 13.07.2026