The Price of Not Knowing

On a €1,000 room night, €5 is half of one per cent. It will not change how anyone travels. In my experience, guests at that level rarely question a surcharge of that size. What they do ask, and sometimes pointedly, is where the money goes and whether the number means anything.

There is also a risk worth naming early. In a well-known field study, Uri Gneezy and Aldo Rustichini introduced a small fine for parents who collected their children late from day-care centres in Haifa. Late pick-ups went up, and stayed up after the fine was removed. The fine had become a price. A modest carbon charge on a luxury folio could do the same: turn a responsibility into a transaction the guest considers settled at checkout. So the case for making emissions visible in luxury is not really about deterrence. It is about accountability, and accountability depends on two things: credibility and visibility.

Is it time?

The figures in this viewpoint are deliberately conservative. The German Environment Agency’s 2026 rate of €350 per tonne rises to €1,000 when the welfare of future generations counts equally, and the energy footprint of a room night is only part of the picture. For remote resorts, the larger share sits outside the building. Soneva introduced a mandatory 2% environmental levy on room revenue in 2008, after concluding that around 85% of its footprint lay in scope 3, much of it guest flights. Its path since then is instructive. The levy’s early proceeds funded projects as far away as India and Sudan; more recently, the company has invested around US$9 million in solar power and battery storage at its own Maldivian resorts. That is the direction the whole industry needs to travel: from compensating elsewhere to reducing at source, and creating richness as a goal. The question for luxury is not whether a line on the bill is possible. Some operators have shown that it is. The question is why it is still treated as an exception.

In what form, and who carries it?

I would not support a flat levy based on segment averages. It would tax guests while telling us nothing about the hotel. A five-star property that has invested in heat pumps, a better building envelope and a cleaner energy supply would charge the same as one that has invested in nothing.

In our work assessing luxury properties, the gap is rarely ambition. It is evidence and meaning: metered data that is consistent over time and can be checked by someone outside the hotel. That is why I would propose what I call a verified carbon line. It is calculated from the property’s own metered data, priced at an official social cost of carbon, and checked independently once a year. Hotels that cannot or will not demonstrate their numbers apply a default that is deliberately set high. Europe already uses this logic. Under the Carbon Border Adjustment Mechanism, importers who do not provide verified emissions data fall back on default values carrying a mark-up of 10% this year, rising to 30% from 2028. The principle is simple. Not knowing should cost more than knowing.

That design also answers who pays. The guest pays the line, but the owner controls its size. Every decision about design, systems and energy supply shows up on the bill, night after night. Two villas at the same rate, one carrying a €4 line and the other €15, tell a guest more about the property than most sustainability pages do. For the first time, environmental performance would become visible at the moment luxury guests are most attentive to value: at checkout.

On scope, my rule would be: charge what you control, disclose what you don’t. The stay itself should be the minimum. Operators that want to go further and include the journey, as Soneva does, should be free to. Smaller independents will rightly worry about the cost of verification, so it has to be proportionate: utility data, an annual check and tools the industry already has, such as the Cornell benchmarking data behind the Hotel Footprinting Tool. Not an audit designed for a listed company.

Where should the money go?

This is where I would bring a regenerative lens, because paying for damage is not the same as repairing it. A carbon line that simply buys offsets elsewhere may balance a ledger. It does very little for the place the guest has just enjoyed, and in many luxury destinations that place is among the most exposed we have: coastlines, islands, reefs, mountains.

I would order the spending as reduce, restore, then compensate. First, decarbonise the destination itself, its grid, its water and its transport, so that the line falls for every hotel over time. Second, restore the living systems that protect the place and its economy: reefs, mangroves, dunes, watersheds. Compensation elsewhere comes last, for what cannot yet be avoided, rather than first because it is the easiest thing to buy.

The Mexican Caribbean offers a useful lesson in both the promise and the difficulty. Quintana Roo created a Coastal Zone Management Trust, funded by tourism taxes, to maintain the reef and buy parametric insurance against hurricanes. The policy has paid out, after Hurricane Delta in 2020 and Beryl in 2024. Yet The Nature Conservancy’s own review is candid: money could not move quickly from the trust to the reef brigades, and the trust ended up funding long-term restoration rather than rapid response. Raising the money was not the hard part. Governing it was.

Research on carbon pricing points the same way. Stefano Carattini, Maria Carvalho and Sam Fankhauser’s review of public resistance to carbon taxes identifies earmarking and clear communication about how revenue is used as ways to build acceptance. I would go one step further. Earmarking tells people where the money is meant to go. It does not tell them what it achieved. Any fund built from a carbon line should publish, every year, what it raised, what it financed and what measurably changed. The verification we ask of the hotel’s emissions should apply equally to the fund’s results.

What the bill cannot show

A carbon line, however well designed, records only what a stay takes. Regenerative luxury asks the harder question: what does the stay leave behind? A reef with more live coral than five years ago. A cleaner local grid that serves the village as well as the villas. Local people trained in the skills that keep a place healthy. None of that appears on a folio today, yet these are exactly the outcomes by which, as I have argued elsewhere, regenerative luxury should be defined and audited. Over time, I would like our industry to show both sides: the verified cost of the stay, and the verified contribution of the fund it fed. That is the difference between a hotel that pays for its damage and one whose place is measurably more alive because it is there: they become richness generators for themselves and their communities.

We have spent two decades asking hotels to tell us what they are doing about carbon. A verified line on the bill would ask something harder: to show it, every night, in euros. The properties that already measure well have the most to gain. For those that cannot prove their numbers, the most expensive line on the bill will be the unverified one: charged at the penalty rate, and paid for a second time in lost credibility.