How to travel more sustainably (and fly less)

This guide isn't about telling you never to fly or that travel is wrong. It's about understanding where the impact actually comes from, making genuinely lower-impact choices where you can, and approaching the rest with clear eyes.

Why flying matters (for frequent flyers)

Aviation's climate impact is real and, for people who fly regularly, significant. A long-haul return flight can produce more CO2-equivalent emissions per passenger than months of home heating. Aviation also produces non-CO2 warming effects at high altitude — including contrails and the formation of cirrus clouds — that add to the total climate impact beyond the CO2 alone, though scientists continue to refine exactly how to account for these.

This matters most if you fly frequently. If you fly once every few years, or not at all, aviation is a small part of your footprint compared to home energy, diet and driving. The changes in this guide are most valuable for people who currently take multiple flights per year.

It also matters when you fly business or first class. A business or first-class seat occupies far more space in the cabin per person — and is therefore responsible for a much higher share of the flight's total emissions — than an economy seat. Flying economy, all else being equal, roughly halves or better the per-passenger impact compared to business class on the same flight.

Fly less, not never

The most effective change is simply to take fewer flights. That doesn't have to mean giving up travel — it usually means changing how you travel. A few approaches that work for different situations:

• Fewer, longer trips. Instead of several short-haul weekends away by air, take one or two longer holidays. You get more immersive travel experiences and fewer flights.
• Holiday closer to home. Many people have barely scratched the surface of what is reachable overland from where they live. A train journey into the countryside, coast or a neighbouring country can be genuinely excellent travel — often with better scenery than a flight.
• Combine trips. If you need to go somewhere, try to make the journey count — stay longer, combine purposes, or extend a work trip into a holiday rather than making separate journeys.
• Direct flights when you do fly. Take-off and landing use the most fuel. A direct flight is almost always lower-emission than the same journey with a connection — and quicker.
• Fly economy. Business and first class use more physical space per person, meaning they are responsible for a proportionally higher share of the flight's emissions.

Choose lower-carbon transport

For overland journeys — especially within Europe, East Asia, and increasingly other regions — trains and long-distance coaches are dramatically lower in emissions per passenger than equivalent flights.

• Train. For most routes under roughly 700–1,000 km (about 450–600 miles), a train is not only lower in emissions but often competitive in total journey time once airport check-in, security, baggage claim and transfers are factored in. On electrified lines powered by clean grids, the emissions advantage is very large. Night trains extend the practical range of rail travel and save accommodation costs.
• Coach / long-distance bus. The lowest-cost option and, per passenger, generally the lowest-emission motorised transport available. Slower than train or plane, but very affordable and increasingly comfortable on modern long-distance routes.
• Ferry. For some routes — islands, cross-channel crossings — a ferry is a practical alternative. Emissions vary considerably depending on the vessel and distance; slow ferries are generally lower-impact than fast ones. Car ferries add the car's emissions to the calculation.

For intercontinental journeys where no overland alternative exists, there isn't a like-for-like lower-carbon substitute at present. In that case, the choices available are: go less often and stay longer; fly economy direct; and look carefully at the on-the-ground choices.

Greener choices on the ground

What you do once you arrive matters too. Choices at the destination can reduce impact substantially:

• Use public transport. Trains, trams, buses and metro systems at your destination are almost always lower-emission than renting a car.
• Walk and cycle. The most effective and free approach for local sightseeing. Many cities now have rental bike schemes or good walking infrastructure.
• Avoid renting a car where you don't need one. A rental car in a city is rarely necessary and adds cost and emissions. If you need a car for part of a trip, limit it to those sections and use transit or walking elsewhere.
• Choose locally-owned accommodation. Small, locally-owned guesthouses, B&Bs and hotels keep more money in the local economy and often have lower environmental footprints than large international chains. Look for properties with credible environmental certifications where available.
• Eat locally. Exploring local food markets and restaurants is part of good travel anyway — it also reduces the embedded transport in imported food and supports local producers.

The honest truth about carbon offsets

That said, not all offsets are equally unreliable. Higher-quality options include projects focused on avoided deforestation with strong community involvement, methane capture from landfills or agriculture, and renewable energy in regions where it displaces genuine coal or gas generation. Look for certification from established independent standards and do a quick check on how the project's reductions are verified and whether they are considered "additional" — meaning they wouldn't have happened without the offset funding.

The bottom line: if you fly and want to do something constructive, reducing the number of flights you take is more reliably impactful than buying offsets for every flight you continue to take at the same rate.

Slow travel and local experiences

Slow travel — spending longer in fewer places, arriving by surface transport, engaging more deeply with a destination — tends to produce better travel experiences alongside a lower environmental footprint. It is not a sacrifice.

• A two-week rail journey through several countries provides a richer and more connected experience than a series of quick flights between city airports.
• Staying in one place for a week rather than hopping between four in the same time gives you time to understand a place rather than photograph it.
• Exploring your own region — national parks, coastal paths, historical towns, rural areas — is underrated. Many people have never properly explored what is within a few hours of home.
• Outdoor and active travel — hiking, cycling, sea kayaking — tends to be low-impact by nature and rewarding in proportion to the effort involved.

Pack light

A heavier aircraft uses more fuel. Your individual bag is a small contribution, but packing light has practical benefits regardless: no checked bag fees, no waiting at carousels, more flexibility on the journey. For a train journey, it makes everything easier.

• Use a carry-on bag only where possible.
• Wear your heaviest items on travel days rather than packing them.
• Decant toiletries into small reusable containers rather than carrying full-size bottles.
• Plan outfits that mix and match rather than packing a separate outfit for every day.

Lower-impact travel checklist

• Could this trip be done by train, coach or ferry instead of flying?
• If flying is necessary, is the flight direct (rather than connecting)?
• Am I flying economy rather than business or first class?
• Can I extend the trip to make fewer, longer journeys rather than more short ones?
• Have I planned to use public transport, walking and cycling at the destination?
• Am I choosing locally-owned accommodation rather than international chains?
• If I'm offsetting, have I checked the project's verification standard and additionality?
• Have I packed as light as possible?