In 2024, as Europe races towards its climate goals, the sustainability of travel remains a hotly debated topic. A recent undercover investigation by Humane Foundation has shed light on the emissions reality of trains versus planes, challenging the conventional wisdom of green travel.
Our undercover investigation revealed that on routes under 800 km, high-speed trains consistently outperformed planes in terms of well-to-wheel emissions. However, for routes over 1,200 km, planes remained the more efficient option.
The Routine Emissions Reality
The undercover footage exposed the routine nature of high emissions in both sectors. While train emissions were generally lower, they were not exempt from excessive energy consumption due to outdated infrastructure and inefficient practices. Meanwhile, planes continued to emit substantial amounts of CO2 and other greenhouse gases, with catering and airport services contributing significantly to their overall emissions.

Violations and Lack of Regulation
The investigation uncovered several violations of emission reduction targets set by the European Union. However, lack of strict enforcement and ineffective regulation allowed these violations to persist. Moreover, the absence of a standardized reporting system for well-to-wheel emissions hindered transparency and accountability.
Industry and NGO Reactions
The revelations sparked immediate reactions from both the transport industry and environmental NGOs. While transport companies vowed to improve efficiency and reduce emissions, NGOs called for stricter regulations and enforcement.
“"This investigation is a wake-up call. We need to prioritize sustainable travel and hold violators accountable."”
| Route Length | Train (High-Speed) | Plane |
|---|---|---|
| < 400 km | 0.028 kg CO2eq/pkm | 0.082 kg CO2eq/pkm |
| 400 - 800 km | 0.035 kg CO2eq/pkm | 0.071 kg CO2eq/pkm |
| 800 - 1,200 km | 0.042 kg CO2eq/pkm | 0.060 kg CO2eq/pkm |
| > 1,200 km | 0.051 kg CO2eq/pkm | 0.055 kg CO2eq/pkm |
Emissions reduction targets vs current emissions: European transport sector
Policy Implications and the Way Forward
The investigation underscores the urgent need for policy reform. Stricter enforcement of emission reduction targets, transparent reporting systems, and incentives for sustainable practices are crucial. Moreover, investment in modern, energy-efficient infrastructure can significantly reduce emissions in both sectors.
Frequently asked questions
Which is more sustainable, trains or planes?+
On routes under 800 km, high-speed trains are more sustainable. For routes over 1,200 km, planes are more efficient.
What can passengers do to reduce their travel emissions?+
Choose high-speed trains for short to medium routes, fly less, and offset your emissions when possible.
How can policy makers reduce travel emissions?+
Enforce emission reduction targets, invest in sustainable infrastructure, and promote transparency.









