In a move set to reshape the aviation industry’s approach to environmental accountability, European officials have agreed to new regulations requiring airlines to report the climate impact of vapour trails and their annual carbon dioxide emissions.
The decision, made behind closed doors on Friday, August 30, has sparked significant debate, particularly among industry stakeholders who argue that the science surrounding contrails is not sufficiently developed.
Under the new rules, airlines operating from European airports will need to disclose not only the amount of CO2 they emit but also the estimated climate effects of contrails—vapor trails left by jet engines.
This new reporting obligation is part of a broader initiative to better understand and mitigate the aviation sector’s impact on global warming.
The European Commission, which endorsed the new regulations, acknowledged the existing uncertainties regarding the non-CO2 effects of aviation but maintained that the overall contribution to global warming is well-documented.
“Studies have shown that the uncertainty in these effects is not a sufficient reason to avoid action,” the EU executive stated in a press release.
Contrails, which consist of nitrogen oxides, black carbon, and other substances, contribute to climate change by promoting cloud cover in the upper atmosphere.
Unlike low-lying clouds, these high-altitude clouds can trap heat, thereby exacerbating global warming. Some estimates suggest that the impact of contrails on global warming is comparable to the 2% of global CO2 emissions attributed to aircraft.
The new legislation, however, has faced criticism from environmental groups due to a temporary exemption for long-haul flights.
Initially, the reporting requirements will apply only to flights between airports within the European Economic Area (EEA), which includes the EU along with Iceland, Norway, and Switzerland. The rules are expected to extend to all flights entering and leaving the EU starting in 2027.
Krisztina Hencz, aviation policy manager at the Brussels-based lobby group Transport & Environment, expressed disappointment with the compromise.
“Long-haul airlines receive preferential treatment once again from the EU,” Hencz told Euronews. “They have worked hard to undermine action and research on non-CO2 emissions and are being rewarded for their efforts.”
Despite the carve-out, Hencz acknowledged that the regulations still mark a significant step forward in addressing the aviation industry’s climate impact.
“At the end of the day, this proposal was intended to enhance our understanding of non-CO2 effects, and this effort has been somewhat hindered,” she added.
The new EU regulations also address the carbon footprint of sustainable aviation fuels (SAFs), which can be derived from biofuels, organic waste, or green hydrogen.
To qualify as zero-emissions under the trading scheme, SAFs must have a life-cycle carbon footprint at least 70% lower than that of standard kerosene.
Additionally, when renewable electricity is used in the production of these fuels, it must come from newly deployed renewable energy sources, such as dedicated wind turbines or solar arrays.
This legislative move follows recent reforms to the EU’s emissions trading system (EU ETS), which requires certain companies to purchase allowances for each tonne of CO2 they emit.
With the price of allowances currently around €70 per tonne, the cost of emissions for a single passenger’s transatlantic round trip can be substantial.
The European Commission’s new regulations are intended to bolster transparency and encourage the aviation industry to take greater responsibility for its environmental impact.
While the industry has voiced concerns about the implementation and the scientific basis for some of the new measures, the EU remains committed to advancing its climate goals.
The debate surrounding these regulations highlights the ongoing tension between environmental objectives and industry interests, as Europe continues to navigate its path towards more sustainable aviation practices.