Opt for the modes of transport which emit the least to arrive at your destination. For instance, a bus from Belgium to Austria emits approximately 6 times less CO2e than a plane. And for the remaining emissions you can contribute to trustworthy climate projects though Greentripper.

You can be a responsible traveller by simple gestures:

1. Think about the mode of transport: can you replace your trip by plane with a trip by train? Can you carpool?
2. Reserve accommodation with a green label:
   • Choose a hotel with a green label. These hotels are anxious to conserve the environment and use local resources.
   And on location:
   • If you stay in the same hotel for several days, ask to keep your towels.
   • Access to electricity is also limited in certain countries. Switch off electrical appliances and the lights in a room when you are not there.
   • Do not waste water; it is a valuable resource.
3. Prepare green baggage: take a drinking bottle, choose biodegradable products (soap, sun cream, detergent, etc.) because they wind up in the waters and destroy the ecosystems, corals, etc. .
4. Share your equipment (tent, camping equipment, etc.)
5. Preserve the ecosystem:
   • If you go diving, take care not to touch corals with your hands and do not walk on them.
   • Do not feed the animals and do not touch them; that may seriously disrupt their feeding habits.
   • Do not cut flowers because some species are endangered.
6. Buy and eat organic foods locally:
   • If you want to eat meat, ask for the provenance of meat. Try to buy local, labelled meat.
   • Opt for local handicrafts for your souvenirs.
7. Reduce waste:
   • Do not throw waste in nature and, whenever you can, collect waste found along your way (plastic bags, cans, etc.) and put them in the nearest rubbish bin. Waste left lying around may cost certain animals (birds, fish, turtles, etc.) their life.
   • If you are a smoker, take a pocket ashtray along because a cigarette butt takes a long time to decompose.
8. Opt for ecological activities.
9. Contribute for 100% of the environmental impact of your flight. Just enter your city of departure and of destination, choose your project, and contribute.
10. Support certified projects.

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The further you go, the more CO2ee you emit. The cost depends on your destination and the transport used.

Use our carbon footprint calculator to find out the carbon footprint of your trip and try to reduce it by choosing a less emissive means of transport (train instead of plane).

Once you have reduced your footprint as much as possible, you can contribute to climate projects. The CO2e contribution represents a small part of the cost of your trip. It's a small gesture that has a concrete impact. If you travel, it is better to contribute to climate projects than to do nothing.

Some examples for air travel:

• Brussels-Barcelona (round trip - economy class): +-€ 10 incl. VAT/per person for +-400 kg of CO2 equivalent
• Brussels-Lima (round trip - class): +-€ 90 incl. VAT/per person for 3.88 tons of CO2 equivalent
• Brussels-Kigali (round trip - economy class): +-55 € incl. VAT/per person for 2.3 tons of CO2 equivalent.

Greentripper calculates the total environmental impact of travels. If we want to calculate the complete impact of travels, we have to take into account the CO2-equivalent emissions, but also other factors such as the radiative forcing (or high altitude) effect, for example for air travels.

We base our Emission factors for flight travels on 2 official methodologies: Greenhouse gas reporting by DEFRA (Department for Environment, Food & Rural Affairs - GOV.UK) & Bilan Carbone by ADEME. Every 6 months, we follow the evolution of the Emission Factors of these 2 methodologies and we adapt them on our calculator if necessary.

In 2022, according to DEFRA, an airplane emits between 0.164 and 0.273 kg of CO2 equivalent per passenger-km in Economy class. According to Ademe, for planes with more than 100 seats, an airplane emits between 0.152 and 0.305 kg of CO2 equivalent per passenger-km in Economy class

What is taken into account in these emission factors?

• The CO2e impact of burning kerosene
• The impact of radiative forcing, it multiplies by +- 2 the impact of the kerosene combustion.
• The WTT impact (Well-to-tank impact) which corresponds to the CO2e impact to produce kerosene
• The class used by the traveller: Economy, Premium Economy, Business or First.
• We take into account the different greenhouse gases (CO2, but also other greenhouse gases such as CH4 and N2O) which are converted into a CO2-equivalent. That is why we speak about CO2-equivalents (CO2e) and not CO2.

The differences are explained by the calculation method used and the type of projects supported.

At Greentripper, we use two official methodologies: ADEME's Bilan Carbone ©, where each emission factor is provided with an uncertainty of 20% to 50% & DEFRA's Greenhouse gas reporting (Department for Environment, Food & Rural Affairs - GOV.UK).

For air travel, on www.greentripper.org, we want to give you the total impact of your travel, we take into account the radiative forcing effect which is not taken into account by all calculators. The price per tonne of CO2e also depends on the type of project we support. Indeed, the price of a climate project depends on different factors: the country in which the project is developed, the technology used, the size of the project (how many tons of CO2e can be reduced or avoided each year), the number of stakeholders that make the project possible (NGOs, project developers, consultants, ...), the type of label that certifies, among other things, the transparency, the impact on the Sustainable Development Goals and the additionality of the project.