How to Offset Carbon Emissions When Traveling, Honestly

So how do you offset carbon emissions when traveling? The honest short answer: first reduce what you can. Then, for what is left, buy credits only from projects certified under a recognised standard, listed in a public registry and described in plain language. And accept that even good offsets do not make a flight carbon-neutral. The rest of this piece explains why.

“Carbon offsetting” gets used a lot in travel. Sometimes it is a genuine tool, sometimes a checkbox that lets a flight or a resort feel less complicated than it is. Both can be true at once. Offsetting is a real mechanism with real standards behind it, and it has also been misused enough to deserve a more careful look than a click at checkout.

This piece is narrower than our general guide to lowering your footprint on an ocean trip, which covers flights, accommodation, sunscreen and daily habits. Here we stay with offsetting itself: what it is, how a credible project is verified, and where the honest limits of the idea are.

What carbon offsetting actually means

At its simplest, an offset is a credit you buy that funds a project designed to remove greenhouse gases from the atmosphere, or to stop them being emitted somewhere else, in an amount roughly equal to the emissions from your trip. It does not undo the flight’s emissions. It is a way to compensate, not an eraser.

Offset projects usually fall into a few groups:

• Forest protection and reforestation
• Renewable energy (solar and wind replacing fossil-fuel power)
• Coastal and marine “blue carbon” projects: mangroves, seagrass, salt marsh
• Methane capture and more efficient cookstoves
• Community-based conservation

Some of these are measured much more carefully than others, which is exactly why the checking matters more than the category.

How is a credible carbon offset project checked?

This is the part that is easy to skip, and the part that separates a genuine offset from a vague promise. Serious programmes are audited by independent bodies, not certified by themselves. Under Verra’s Verified Carbon Standard, one of the most widely used frameworks in the voluntary carbon market, a project is first validated: an approved validation and verification body checks the project design against the programme rules, before the project starts. Then, during or after the project, accredited auditors verify how much carbon was actually reduced or removed, and this must happen before any credits are issued. Each credit stands for one tonne of CO₂ reduced or removed, and Verra keeps a public registry of registered projects and of credits issued and retired. Gold Standard is another established certifier you will often see named, and the same questions apply to it.

The idea underneath most of this is “additionality”. The reduction has to be something that would not have happened without the project’s funding. A forest that was never going to be logged does not create a genuine offset just by being left alone. A forest that was clearly at risk, and is protected because of the offset money, does. It sounds technical, but it is the single biggest reason some credits turn out to carry far less real climate benefit than advertised.

That is not a hypothetical worry. UC Berkeley’s Carbon Trading Project, led by Barbara Haya, has published several critical studies. A 2023 analysis of nearly 300 “improved forest management” projects found that the major registries systematically over-credit them. A 2024 study of cookstove projects estimated that their credits overstate carbon savings by roughly a factor of ten. The same group told the UN climate secretariat in 2023 that it saw widespread over-crediting across several common project types. It is a real, ongoing debate in the field, not a settled question, and it is one reason I would rather be open about the uncertainty than present offsetting as a clean fix.

In practice, look for the boring, checkable details before you buy a credit: a named standard (Verra, Gold Standard or similar), a public registry entry you can actually look up, and a plain description of what the project does and where. A vague “plant a tree” button at checkout, with no named standard behind it, is not the same thing.

The ocean side: why blue carbon projects deserve a second look

Given what we do, ocean projects interest us most, and there is a real scientific case for them. NOAA says that mangroves and salt marshes remove carbon from the atmosphere about ten times faster than tropical forests, and store three to five times more carbon per acre. Seagrass meadows are even more surprising: they cover only about 0.1% of the world’s seafloor, yet store about 11% of the organic carbon buried in the ocean. NOAA also cites an assessment of 215 studies which found that about 7% of the world’s seagrasses are lost each year, to development, polluted runoff, climate change and other pressures. That is part of why protecting what is left feels urgent, and why a well-run mangrove or seagrass project can be worth supporting. One honest caution: a strong ecosystem does not automatically mean a strong credit. Blue carbon projects still need the same checks on additionality, measurement and permanence as any other.

Reduce first, offset second

The common advice, and the one we agree with, is that offsetting sits on top of reducing, never instead of it. A carbon calculator can give you a rough estimate of a trip’s footprint from flight distance, aircraft type and length of stay. It is an approximation, but a useful start if you decide to offset. Many travellers use that number as a floor, then look at what they can genuinely reduce first: fewer, longer trips, direct routes, and operators who work in small groups with local partners instead of high-volume outfits. We have written about those choices separately. The offset is meant to be the last step, applied to what is left after the easy reductions, not the first and only one. Small daily choices matter less for carbon than flights do, but they still count for the places you visit. A refillable bottle and a simple tropical travel kit cut plastic waste on islands with little recycling, and a rash guard means less sunscreen washing onto the reef. Be honest with yourself that these are about local impact, not about cancelling a flight.

A balanced way to think about offsetting carbon emissions when traveling

Offsetting is a legitimate tool, with real, checkable standards at the careful end of the market, and a history of overstated claims at the careless end. Both are true. The honest approach is to treat an offset like any other claim about impact: ask who verified it, ask whether it is listed somewhere public, and do not expect it to make a long-haul flight carbon-neutral, because it does not.

Travelling toward the ocean will always carry a cost. Understanding that cost, reducing what can really be reduced, and sending the rest toward a project that can show its work is, I think, a fair way to hold that tension. It does not make the tension go away.

If this made you curious about how we try to hold that tension on our own trips, with small groups, longer stays and local partners, you can explore our retreats.

Questions people ask

Wildlife encounters are never guaranteed and never forced. Ocean Calling works only with vetted, ethical local operators, and every animal is free to approach, or not, entirely on its own terms.