The true climate cost of our European travels
Aviation is responsible for approximately 2.5 to 3.5% of global CO2 emissions — but its actual impact on global warming is estimated at two to four times higher, due to contrails and the effects of emissions at high altitude. For Europeans, flying is often the first reflex for medium-distance trips, even when alternatives exist. Yet for the vast majority of European destinations, far lower-emission transport options make it possible to travel differently — sometimes even more comfortably.
In France, the air transport sector accounts for approximately 5% of greenhouse gas emissions, with a strong concentration among a small number of frequent flyers. According to the 2024 report from the High Council for Climate, the 10% of French people who fly the most are responsible for more than 40% of national aviation emissions.
Train vs. plane: the numbers that make you think
The comparison between train and plane on the same routes is clear-cut, at least for European connections under 1,500 km:
- Paris-Lyon (2h by TGV): 2.9 kg CO2e per passenger by train, versus 75 kg by plane — 26 times more for the plane
- Paris-Barcelona (6h30 by TGV): 6.5 kg CO2e by train, versus 115 kg by plane — 18 times more
- Paris-Amsterdam (3h20 by Thalys/Eurostar): 5 kg CO2e by train, versus 90 kg by plane — 18 times more
- Paris-Madrid (13h by train, or 2h by plane): 23 kg CO2e by train, versus 130 kg by plane — 6 times more
- Paris-Berlin (8h by train): 12 kg CO2e by train, versus 140 kg by plane — 12 times more
These figures, from the ADEME and European Environment Agency calculators, take into account not only direct CO2 emissions, but also contrail and radiative forcing effects for aviation. For trains, the electricity used is factored in according to the national electricity mix — which explains why the French TGV, powered predominantly by nuclear energy, has a particularly low footprint.
Routes where the train is clearly superior
For a European traveler departing from France, several rail corridors connect major destinations with no compromise on comfort:
The Paris-London corridor: Eurostar, a benchmark model
With over 10 million annual passengers, the Eurostar Paris-London is the most-used international train in Europe. In 2 hours 30 minutes under the Channel, it connects the city centers of both capitals — eliminating the minimum two hours needed to get to airports (Heathrow or CDG). Its carbon footprint: approximately 6 kg of CO2e per passenger, versus 132 kg for the air equivalent.
The Franco-Iberian corridor: TGV to Spain
The Paris-Barcelona and Paris-Madrid TGV services have seen a resurgence in popularity since 2023, driven by environmental awareness and the availability of competitively priced tickets. Competition on the Franco-Spanish corridor (SNCF, Renfe, Ouigo, Iryo) has significantly reduced prices, making the train choice even more attractive.
The Paris-Rome corridor in development
The Paris-Milan connection (3h45) is already well established. A Turin-Rome ticket connects easily for a Paris-Rome journey in under 7 hours 30 minutes. Trenitalia is progressively developing direct services that should make this corridor even more attractive in the coming years.
Night trains: the great comeback of a forgotten option
After decades of decline, night trains are experiencing a spectacular revival in Europe. Several factors explain this comeback:
- Climate awareness that values alternatives to flying
- Investments by several European states in upgrading sleeper car fleets
- The rise of Austrian operator OBB Nightjet, which has expanded its network to numerous European cities
- The return of SNCF on certain domestic night services (Paris-Briancon, Paris-Hendaye)
The decisive advantage of night trains: you travel while you sleep, saving a night of hotel costs and arriving rested at your destination in the morning. Popular overnight connections departing from France:
- Paris-Vienna (Nightjet OBB): morning arrival in Vienna with berths or private compartments
- Paris-Brussels-Amsterdam-Berlin (Euronight in development)
- Paris-Barcelona (Trenhotel): occasional overnight services
- Paris-Nice-Ventimiglia (restored SNCF night train)
"The night train is the Swiss army knife of the low-carbon traveler: it combines transport and accommodation, maximizes productive time, and minimizes climate impact."
— Man in Seat 61, the global reference for rail travel
Slow travel: traveling differently as an art of living
Beyond the choice of transport mode, slow travel offers a radically different travel philosophy: fewer destinations, more time spent in each one, richer local connections, and a reduced carbon footprint.
In practice, this can translate to:
- Choosing a single country or region rather than "collecting" destinations
- Using local transport (regional trains, buses, bicycles) to get around once there
- Favoring sustainable accommodation (guesthouses, family-run inns, eco-lodges)
- Immersing yourself in local culture rather than consuming "tourist attractions"
- Planning trips in advance to get the best train fares
When flying remains unavoidable: responsible offsetting
It would be unrealistic to claim that flying can be avoided in all cases. For destinations outside Europe, for imperative professional reasons, or for family trips over long distances, flying sometimes remains the only realistic option.
In these cases, carbon offsetting provides a partial — and honestly limited — response to the impact of these flights. The essential thing remains to reduce the number of flights taken. To learn more about offsetting flights and quality certifications, our article on how to offset the carbon footprint of a flight will guide you toward best practices and pitfalls to avoid.
Obstacles to modal shift: what still holds back the transition
Despite the obvious advantages of train travel, several barriers persist:
- Price: low-cost airlines sometimes offer fares lower than train tickets, particularly for last-minute bookings
- Duration: on long routes, the time difference can discourage time-pressed travelers
- Complexity: booking international train journeys remains more complex than booking a single airline ticket on a unified platform
- Availability: some European destinations remain poorly served by the rail network
- Aviation's favorable tax treatment: jet fuel is tax-exempt in many countries, which artificially distorts price competitiveness
Policy initiatives that are changing the game
European regulation is beginning to level the playing field:
- The French Climate and Resilience Law banned domestic flights where a rail alternative of less than 2 hours 30 minutes exists — a symbolic but important measure
- The EU ETS is progressively incorporating aviation into its carbon pricing mechanism
- The regulation on Sustainable Aviation Fuels (SAF) mandates increasing blending rates through 2050
- Several European countries are debating a jet fuel tax, previously blocked by bilateral agreements
To integrate your mobility choices into a comprehensive approach to reducing your personal carbon footprint, our guide on how to reduce your carbon footprint in daily life offers you concrete, prioritized actions adapted to your lifestyle.
Conclusion: the train, a rational choice and an enriching experience
Traveling by train in Europe is not a sacrifice: it is often a more comfortable, less stressful, and more immersive experience than flying. Arriving in the city center, the ability to work or read during the journey, watching the landscapes pass by — so many advantages that aviation cannot offer. Combined with the powerful emission reductions it represents, rail travel is one of the most accessible alternatives for significantly reducing your climate impact, without giving up mobility. All that is missing is the decision to try it — a single trip is often enough to convince.