The conference is the carbon problem nobody puts on the agenda
You can spot a corporate offsite by the receipts. Forty flights converging on a single city. A conference hotel running its ballroom HVAC at full tilt for a room of laptops. Catering for ninety that feeds sixty. Branded tote bags nobody asked for. The agenda will mention sustainability — there's almost always a panel — but the event itself rarely gets audited the way the slide on Scope 3 emissions does. That gap, between what gets said on stage and what gets emitted to put everyone in the room, is where most companies are quietly losing the plot on their climate commitments. The good news: it's also one of the easier gaps to close, if you build the climate accounting into the booking process rather than bolting it on afterwards.
What a "sustainable conference" actually means
The phrase gets thrown around loosely, so it's worth being precise. A genuinely sustainable conference is one where the organisers can answer three questions with real numbers, not vibes:
- What did this event emit? Travel, accommodation, venue energy, food, freight, and waste — totalled, not estimated on a napkin.
- What did we actively reduce? Choices made before the event that lowered the footprint compared to a default version of the same gathering.
- What did we do about the residual? The unavoidable emissions that remain after reduction — and how they were addressed transparently.
If you can answer all three with documentation a finance team would accept, you have a sustainable conference. If you can only answer the third, you have an offset purchase with a logo on it. The distinction matters more every year as disclosure rules tighten and employees, clients, and journalists get better at spotting the difference.
Reduce first: design choices that change the maths
Before anyone talks about offsetting, the bigger lever is event design. A few decisions made early in planning will outweigh almost anything you can do later.
Pick a city your people can mostly reach by ground
Aviation is the single biggest emissions line in most corporate events, often dwarfing everything else combined. If two-thirds of attendees are based across one region, hosting in a hub city served by trains and short hops will move the number more than any catering tweak. Done well, this can also widen attendance — junior staff who'd never get approval for a transatlantic flight can join.
Make the event longer, not shorter, when long-haul is unavoidable
This sounds counterintuitive. But if you're flying a hundred people across an ocean, a one-day summit is the worst possible ratio of emissions to outcome. Extending to two or three days — with substantive content, not filler — improves the per-attendee, per-hour footprint. Combine it with a strong "no flights for follow-ups" rule afterwards and the maths gets better still.
Choose a venue and hotel that are already efficient
Look for buildings with credible third-party credentials — BREEAM, LEED, EU Ecolabel, Green Key, or equivalent — rather than self-declared "eco-friendly" marketing. Ask the venue for a recent energy audit. Ask the hotel for the kWh and water consumption per guest-night. Properties that have done the work will be able to send the numbers within a day. Properties that can't, can't.
Default to plant-forward catering
Beef and lamb dominate the food footprint of most conferences. You don't need to ban anything. Make the default menu plant-forward, offer one quality meat option per service, and skip the buffets that guarantee waste in favour of plated or family-style. The savings show up in the carbon ledger and the catering invoice at the same time.
Cut the swag
Every branded notebook, water bottle, and hoodie has a footprint that travels home in a suitcase and ends up in a drawer. The greenest tote bag is the one you didn't print. If you must give something, give a single useful item people will actually keep — and skip the conference-branded packaging.
Measure properly, or don't bother claiming anything
If you're going to call your offsite a green offsite, you need a footprint number, and that number needs to be defensible. The standard most large companies converge on is the GHG Protocol, with event-level guidance from frameworks like the ISO 20121 sustainable events standard.
For a typical corporate event, you're looking to capture:
- Travel: flights (by class and distance band), trains, taxis, rental cars, with origin-destination pairs collected at registration rather than guessed afterwards.
- Accommodation: room nights, ideally with property-specific data, otherwise regional averages.
- Venue: energy and water for the duration of the booking, plus a proportional share of the venue's annual baseline.
- Catering: meals served, broken down by menu type, ideally with food waste weighed.
- Freight and production: staging, AV, signage, and anything shipped in and out.
- Digital: streaming, recording, and storage for hybrid components — small relative to the rest, but not zero.
The worst version of this is a one-line estimate dropped into the post-event report. The best version is data collected as the event runs — registration captures travel, the venue exports its meter readings, catering reports portions and waste — so you have a near-real-time number rather than a retrospective guess.
What "climate-positive event" should mean — and what it shouldn't
"Carbon neutral" and "climate-positive" are doing a lot of work in event marketing right now, often more than they should. Regulators in the UK and EU have started cracking down on unsupported neutrality claims, and rightly so. If your offsite organiser hands you a certificate, here's what to check before you put the claim in your sustainability report:
- Is the underlying footprint complete? A "neutral" event that ignored Scope 3 travel is not neutral. It's a press release.
- Were credits retired, not just purchased? Retirement on a public registry is the proof. A retirement certificate or on-chain record should be available on request.
- Are the projects high-quality? Look for credits verified under standards like Verra, Gold Standard, or comparable bodies, with recent vintages and clear additionality.
- Is the volume credible? If the offset volume is suspiciously round, ask how it was calculated.
"Climate-positive" should mean the event removed or avoided more emissions than it caused, with both sides of that ledger documented. If anyone uses the phrase without being able to show the maths, treat it as marketing.
Hybrid is a tool, not a virtue
Two years of pandemic-era video calls taught most companies that hybrid events are harder than they look. Bad hybrid is a roomful of energised attendees and a forgotten chat window full of people who tuned out by lunch.
For climate accounting, hybrid is genuinely useful when you use it surgically: in-person for the people who need to be in the room (decision-makers, new joiners building relationships, teams doing actual workshop work), remote for the people whose presence is mostly symbolic. It's less useful as a blanket policy, because mediocre hybrid often produces a worse event that still flies the same number of people.
The honest test: would you fly someone in if they had to pay for the ticket personally? If not, the carbon probably isn't worth it either.
Build the accounting into the booking, not the post-mortem
The reason most company events end up with vague sustainability claims is that the climate work happens months after the booking, when the bills come in and someone in ESG is asked to assemble a number. By then, the choices that mattered — destination, venue, airline, catering — are locked in.
The fix is structural. Climate criteria belong in the brief, alongside the budget and the dates. The booking platform should be capable of surfacing per-property energy and water data, of calculating travel footprints at the point of approval, and of carrying that data through to the final report without a manual spreadsheet rebuild. The offset, if you're using one, should be linked to the booking record and verifiable by anyone who asks. None of this is exotic — it's just bookkeeping applied to carbon the same way it's applied to cash.
The version of corporate travel we're trying to build
This is roughly what IMPT exists to make easier. When a team books accommodation through IMPT.io across a portfolio of more than 1.7 million hotels in 195 countries, every booking offsets one tonne of CO₂ on-chain — the credit retirement is recorded, traceable, and paid for by IMPT out of its commission rather than tacked onto your invoice. For the rest of an offsite — the gifts, the supplies, the things you'd buy anyway — the IMPT shop and IMPT Card route everyday spend through 20,000+ partner brands while contributing to climate action through the IMPT Token. It's not a replacement for designing a lower-impact event. It's a way to make sure the event you do run has receipts you can actually show — for your finance team, your ESG report, and the people you flew in.