How to Reduce Your Environmental Impact on Ocean Trips

Every retreat we run asks people to fly, often a long way, to reach a reef or a whale migration route they may never have seen. We want to be honest about that. Getting to the ocean has a cost, and good intentions do not remove it.

So how can travellers reduce their environmental impact while exploring the ocean? In short: reduce first (fewer, longer trips, fewer flight legs, lower-impact places to stay), protect the water directly once you are there (mineral sunscreen, less plastic, small groups, no touching), and only then think about offsetting, choosing a project you can actually check. This is not about a perfect, guilt-free trip. It is about paying attention, and doing a little better each time.

Where travel emissions actually come from

Most of a trip's footprint comes from a short list of things: flights, boat transfers, ground transport, the energy a hotel or retreat centre uses, the food served, and the waste that ends up in a bin (or, too often, in the sea). For journeys that involve a long flight, the flight itself is usually the biggest single item, which is why many sustainability guides suggest starting there rather than with smaller daily choices.

We do not want to give you neat numbers we cannot back up. Emissions per passenger depend on the aircraft, the route, how full the plane is and the cabin class, and different calculators make different assumptions. What is clear without any calculator: a trip with one long flight and a long stay usually weighs less, per day of travel, than several short trips.

Reduce first, then offset

The order matters. Offsetting is meant to sit on top of a real effort to reduce, not to replace it. A few things help without asking much of you.

Fly direct where it is realistic. A direct route is often shorter in total distance than one with several connections. Stay longer, travel less often. One longer trip usually beats several short ones for the same time away. Choose a place to stay that visibly tries. Solar power, water reuse and real waste separation are easy things to ask about before booking.

Cut down on single-use plastic. A refillable bottle goes a long way on any coast. Ours sits with the other practical things in our tropical travel kit list, next to packing cubes that make it easier to travel with one smaller bag.

Protecting the reef while you are in the water

Sunscreen is the small swap that matters most in the water itself. The US National Park Service advises that mineral sunscreens using zinc oxide or titanium dioxide are not associated with coral bleaching and are less impactful to reefs, while chemical filters such as oxybenzone and octinoxate have the strongest evidence of harm to marine life. The science is not completely settled: some researchers have raised questions about mineral filters too, especially very small "nano" particles. So the best sunscreen in the water is the one you do not need. A long-sleeve rash guard covers most of your skin, and for the rest, a mineral sunscreen applied well before you get in. We go deeper in our reef-safe sunscreen guide.

The rest is behaviour. Do not stand on coral, do not touch or feed animals, keep your fins away from the reef, and give turtles, rays and dolphins space so they can choose whether to stay. None of it costs anything.

Understanding your own footprint

Online carbon calculators give a rough estimate of a trip's emissions based on flight distance, aircraft type, cabin class and length of stay. The number is an approximation, not a precise measurement, but it is usually enough to show scale, and many travellers use it as a starting point for deciding how much, if anything, to offset. If you compare two calculators and get different numbers, that is normal: they use different assumptions.

How do you know if a carbon offset project is worth trusting?

Offset programmes are not all equal, and the field has had real credibility problems. Verra, which runs the widely used Verified Carbon Standard, works with independent auditors (validation and verification bodies) that it approves: they check a project's design before it starts, and then audit its data and reporting before credits are issued. Each credit represents one tonne of carbon dioxide equivalent reduced or removed, and the standard covers ideas such as additionality, permanence and leakage. Issuance and retirement records are public in the Verra Registry.

That system is not perfect. In 2025, Mongabay reported on a University of Pennsylvania study of 95 Verra-registered projects that had previously been flagged for overstating credits; about two-thirds of the accredited auditors who worked on them had failed to spot the flaws. So a label alone is not enough. Look for a named standard, a public registry entry you can open yourself, and a plain description of what the project does, rather than a vague promise to "plant trees somewhere". Our piece on offsetting carbon emissions from travel goes through this step by step.

Why blue carbon matters to ocean lovers

Projects protecting mangroves, seagrass meadows or salt marshes are worth a second look if ocean health matters to you. NOAA calls these coastal habitats blue carbon ecosystems. Its figures say mangroves and salt marshes remove carbon from the atmosphere at a rate about ten times greater than tropical forests, per area, and store three to five times more carbon per acre. When they are degraded or lost, a lot of that stored carbon is released.

NOAA is also honest about the limits: because these habitats cover a relatively small area of the planet, their global benefit for cutting emissions is limited. They are not a reason to fly more. They are a good place to put money if you are going to offset anyway, because they protect marine life at the same time.

During the trip itself

Once you are there, the small things add up. Eat what is local and in season instead of flown-in imports. Walk, swim or cycle instead of taking a car for short distances.

And choose small-group, locally run operators over high-volume ones. Fewer people in the water at once generally means less pressure on the reef and the animals living on it. It is the same reason our hosted retreats take six guests at most, and why we work with local experts who know a reef or channel far better than we ever could from outside.

No perfect trip, just a better one

Offsetting does not erase a trip's footprint, and no operator, including us, should pretend otherwise. What it can do, together with flying a little smarter, travelling with less plastic and choosing who you dive or travel with, is make a real cost a bit more accounted for. Sustainable travel is not a place you arrive at. It is a direction you keep adjusting toward, one trip at a time.

Spending real time in the water often makes this feeling stronger, not weaker. It is hard to float over a healthy reef and not want to protect more of it. If you would like to travel this way with a small group, you can look at our small-group retreats.

Questions people ask

What is the biggest part of an ocean trip's carbon footprint?

For trips with a long flight, the flight is usually the largest single item. Fewer, longer trips and fewer flight legs are the simplest ways to reduce it.

Which sunscreen is better for coral reefs?

The US National Park Service says mineral sunscreens with zinc oxide or titanium oxide are not associated with coral bleaching, while chemical filters such as oxybenzone and octinoxate have the strongest evidence of harm. Covering up with a rash guard reduces how much sunscreen you need at all.

How do I know if a carbon offset is real?

Look for a named standard such as Verra's Verified Carbon Standard or Gold Standard, a project entry you can check in a public registry, and a clear description of the project. Even audited projects can overstate credits, so reduce first and treat offsets as a last step.

What is blue carbon?

It is the carbon stored by coastal ecosystems such as mangroves, salt marshes and seagrass. NOAA says mangroves and salt marshes remove carbon about ten times faster than tropical forests per area, and release stored carbon when they are destroyed.

Does a small group really make a difference?

Fewer people in the water at the same time means less pressure on reefs and animals at that moment. It does not change the flight, which is why we try to be honest about both.

Wildlife encounters are unpredictable 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.

Sources & further reading

1. Protect Yourself and Protect the Reef. US National Park Service, accessed 2026.
2. Fast Facts: Blue Carbon. NOAA Office for Coastal Management, accessed 2026.
3. Assessment of the Verified Carbon Standard (VCS). Carbon Credit Quality Initiative, 2022.
4. Independent auditors overvalue credits of carbon projects, study finds. Mongabay, 2025.
5. Scientists are unraveling new dangers of sunscreen for coral reefs. Smithsonian Magazine, accessed 2026.

Further reading on Ocean Calling: More from the journal · Wildlife & the law · See the retreats · Ocean Atlas