When we think about the environmental impact of an event, we spontaneously picture disposable cups, booth carpeting, or freebies handed out left and right. These items are real, and they deserve attention. But they're trees hiding the forest: transport accounts for an average of 79% of an event's total carbon footprint. (Source: ADEME)
In other words, if you don't address transport, you're missing out on the bulk of your reduction potential — no matter how good your other actions are.
What exactly are we talking about?
Transport covers far more than just attendee travel. It includes the journeys of all the event's stakeholders: participants or visitors, of course, but also staff and volunteers, suppliers (and their equipment), as well as speakers.
Three variables determine the impact of each of these flows: the number of people traveling, the distance covered, and — above all — the mode of transport used. This last variable creates the most dramatic differences: according to ADEME's calculations, traveling by train pollutes 8 times less than driving a car, and 14 times less than flying.
A single speaker arriving on a long-haul flight can weigh more heavily on your carbon footprint than thousands of participants arriving by public transport.
The number one lever comes into play before you send a single invitation
The most decisive factor for your transport footprint is the choice of venue. Once the site is booked, a large share of travel emissions is already locked in.
Three questions to ask when selecting a venue:
Where are my participants coming from? Choosing a location close to your audience mechanically reduces the distances traveled. A national event is often better held in a city well connected to the rail network than in a remote venue, however appealing it may be.
Is the site accessible without a car? Proximity to a train station, public transport stops, bike lanes: accessibility shapes your participants' mobility choices far more effectively than any awareness campaign.
Can flying be avoided? If a significant share of your audience can only get there by plane, question the format itself: a hybrid edition or regional hubs can sometimes achieve the same goal with a fraction of the footprint.
Four concrete actions to reduce transport emissions
Once the venue is chosen, several levers remain in your hands.
1. Build mobility into the registration form. Add questions about the planned mode of transport and distance traveled. Double benefit: you collect reliable data for your carbon assessment, and you create a moment of awareness — the participant who declares their mode of transport has already started thinking about it. Bonus: embed ADEME's Transport simulator into the registration process so your participants can compare the carbon impact of their travel options.
2. Make alternatives to solo driving and flying easy. Share public transport itineraries before the event, set up a carpooling platform, provide proper bike parking. The goal: make the low-carbon option as easy as the default one. Want to go further? Offer a reward for low-carbon journeys, align your start time with train schedules, reserve parking exclusively for carpoolers. You can't choose for your participants, but you can concretely steer their choices.
3. Provide shuttles — and make them electric. For the last few kilometers between the station and the venue, a well-filled shuttle replaces dozens of taxi or car trips. The choice of vehicle matters: for the same service, an electric shuttle significantly reduces the impact compared to a combustion-engine one.
4. Set guidelines for speaker travel. Give clear instructions from the moment of invitation: favor the train whenever the journey allows, group arrivals together, consider videoconferencing for short talks coming from far away. A high-profile speaker flying in for a 30-minute keynote is a trade-off worth raising explicitly.
Measure early, to decide in time
The classic trap: discovering the true weight of transport in the final carbon assessment, weeks after the event, when it's too late to act.
The opposite approach is far more effective: produce a preliminary estimate as early as the design phase. It lets you compare scenarios against each other (this venue or that one? electric or combustion shuttles?) and steer decisions toward the lowest-carbon options — while those decisions are still being made.
That's exactly what Climeet Express enables: get a first order of magnitude of your event's footprint in just a few minutes, category by category, and immediately identify where to focus your efforts.
Key takeaways
Transport is almost always an event's largest source of emissions, far ahead of everything else. The good news: organizers can reduce it — provided they act early. Venue choice, mobility data collection from registration onward, credible alternatives to cars and planes: the levers are well known, and their effects are measurable.
💡 To go further, download our Playbook for a Low-Carbon Event, a complete guide to measuring, reducing, and managing the impact of your events.
.png)