The Carbon Cost of a Fiji Conference, Calculated

A 200-delegate conference in Fiji drawn mostly from Australia and New Zealand carries roughly 150 tonnes of CO2e in air travel alone — about 750 kg a head on a return economy ticket. Flights are the overwhelming share of the total. Almost everything you change on the ground moves the number by a rounding error.

That is the finding. The rest of this article is the method, the numbers by origin city, and the parts we could not source honestly.

How do you actually calculate a conference's carbon footprint?

Three inputs, in descending order of importance:

1. Air travel. Distance flown per delegate, multiplied by an emissions factor for the cabin class.
2. Accommodation. Room-nights multiplied by a per-night factor.
3. On-site energy, catering, ground transport and materials. Everything the event itself consumes.

For the flight leg we have used the UK's DESNZ (formerly DEFRA) 2025 greenhouse gas conversion factors, because they are the most widely adopted published set in Australasian corporate reporting and because they are free to check. The long-haul economy factor is 0.109 kg CO2e per passenger-kilometre, tank-to-wheel and including radiative forcing — the uplift applied to account for the non-CO2 warming effects of contrails and nitrogen oxides at altitude. Adding well-to-tank emissions (the energy used to extract, refine and deliver the fuel) takes it to roughly 0.134 kg CO2e per passenger-km.

Distances are great-circle distances between airport coordinates. Real flight tracks are longer, so treat these as a floor.

What does the flight to Fiji cost in carbon, by origin city?

Return economy, per person, to Nadi International (NAN):

The headline that matters: an Auckland delegate costs about a quarter of what a Vancouver delegate costs. Where your people come from is the single biggest lever you have, and it is usually decided before anyone starts talking about sustainability.

What does a whole conference come to?

Take a plausible 200-delegate regional conference: 70 from Auckland, 50 from Sydney, 30 from Melbourne, 30 from Brisbane, 20 from Los Angeles. All return economy.

Note what the table does to your intuition. The twenty Los Angeles delegates — ten per cent of the room — produce more emissions than the seventy from Auckland. If you are trying to reduce the number rather than report it, that is where you look first.

Does business class really matter that much?

Yes, and by more than most people expect. A premium cabin seat occupies several times the floor area of an economy seat, so it carries several times the aircraft's emissions.

Here the published sources diverge, and it is worth saying so plainly rather than picking the flattering figure. Two independent renderings of the DESNZ 2025 set give long-haul business class as 0.317 kg CO2e per passenger-km and 0.41077 kg CO2e per passenger-km respectively. The gap appears to be scope — the lower figure is tank-to-wheel, the higher one states that it includes both radiative forcing and well-to-tank — but we have not verified either against the primary DESNZ spreadsheet, so we publish both.

On the lower of the two, a return Sydney–Nadi business ticket is about 2,010 kg CO2e against 691 kg in economy. One executive flying business roughly cancels out three people flying economy from the same city.

If your organisation has a travel policy and a climate target, and the policy lets senior staff fly business on a three-hour sector, the two documents are arguing with each other.

How much of the footprint is on the ground in Fiji?

Less than you would like, if your hope is that a good venue choice offsets the flights.

We can be precise about the flights because the distances and factors are published. We cannot be equally precise about the Fiji ground footprint, and we are not going to invent it. What we can say honestly:

• Fiji's grid is roughly 60% hydro and 40% diesel and heavy fuel oil, according to the US Government's Fiji Country Commercial Guide. That guide does not state the year of the figures, so treat them as indicative.
• Fiji's Third Nationally Determined Contribution (NDC 3.0), as summarised in the same guide, targets near-100% renewable electricity by 2030 and 100% by 2035, with a plan to ban heavy fuel oil imports by 2030 under the National Energy Policy 2023–2030.
• We could not find an authoritative, current published grid emission factor for Fiji. The figures circulating online are third-party estimates based on assumed generation mixes. We are not going to reprint one as though it were a measured number.

The practical consequence is that a resort on Viti Levu running on the national grid is cleaner per kilowatt-hour than an outer-island property running a diesel generator around the clock — but neither difference is large enough to change the shape of the pie chart. The flights are the pie.

What actually reduces the number?

In rough order of effect:

• Choose the origin mix, not just the destination. If 80% of your delegates are in Australia and New Zealand, Fiji is a genuinely short-haul destination for them. If half your delegates are in North America or Europe, Fiji is an expensive choice in carbon terms and you should be able to say why it is still the right one.
• Make the trip longer, not more frequent. One four-day meeting a year beats two two-day meetings. The flight cost is fixed per trip, not per day.
• Fly direct. Nadi Airport reports that it is served by 20 airlines connecting to 15 international cities on 38 scheduled international flights a day. A connection through a third country adds a take-off and landing cycle, which is the fuel-intensive part.
• Cut premium cabins before you cut anything else. See the table above.
• Then, and only then, optimise the ground programme. Local sourcing, no single-use plastics, shared coach transfers instead of individual cars, sensible air-conditioning setpoints, digital collateral. These are all worth doing. None of them is a substitute for the first four.

Shared ground transport is the one on-site decision with a measurable effect at scale: moving 200 delegates in coaches rather than cars is a real reduction, and Fiji has coach operators sized for it — see Tourist Transport Fiji, TEWAKA Fiji and Pacific Transport Limited, or the full transport directory.

Does offsetting fix it?

Offsetting changes your reported number. It does not change the physics of the flight. Treat it as the last step after reduction, buy quality that you can point to, and do not let the purchase of offsets be the thing you tell delegates about.

There is a better story available in Fiji, which is that the money spent on the event lands somewhere it matters. Fiji's tourism economy is the direct employer of much of the workforce your delegates will meet. Legacy and community work built into the programme is not a carbon offset and should never be described as one, but it is a defensible answer to "why fly?". We have written about the practical options separately in CSR and legacy activities for incentive groups.

So what is the honest conclusion?

You cannot hold a low-carbon international conference in Fiji, and neither can you hold one in Singapore, Honolulu or Queenstown. Every destination that requires a flight carries the flight.

What you can do is be accurate about the size of the number, put it in the board paper next to the reason the meeting is being held in person at all, choose the origin mix and the cabin policy deliberately, and make the trip long enough and valuable enough to justify itself. A 149-tonne conference that replaces four separate 40-tonne regional meetings is a reduction. A 149-tonne conference that could have been a video call is not.

If you need the cost side of the same decision, what a Fiji conference costs per delegate sets out the money. Getting a group into Fiji covers the air access that drives both numbers. And running a sustainable event in Fiji is the hub for everything else in this cluster.

Method note. Distances are great-circle calculations between published airport coordinates and understate actual flown distance. Emissions factors are the DESNZ/DEFRA 2025 set as reported by secondary references; we have not verified them against the primary spreadsheet. Figures are for guidance in planning, not for statutory reporting — for that, confirm factors with your own reporting framework and, for Fiji-specific energy data, with Energy Fiji Limited and the Fiji Ministry of Finance.