Livestream carbon emissions: measuring real impact

Livestreaming and hybrid events can lower an event's carbon footprint mainly by avoiding participant and speaker travel, not by making the event's own emissions disappear. The size of that reduction depends entirely on who would have travelled, how far, and by what mode.

That distinction matters more than ever. From 27 September 2026, Directive (EU) 2024/825 applies across the EU and tightens what organisations can legally claim about the environmental performance of their products, services and events. Vague labels like "green," "sustainable," or "carbon-neutral" without verifiable backing move from marketing fluff into legal exposure. Belgium's Federal Public Service Economy has already flagged this directly: a claim is misleading when it is incorrect, exaggerated, or impossible to verify.

We've spent several years communicating about the climate impact of our livestreaming and hybrid event work, and the question we get most from communications directors and event managers isn't "is streaming green?" It's "can you show me the number, and can I defend it if someone asks?" This article answers that second question.

What actually changes under the new EU rules

Directive (EU) 2024/825 requires that environmental claims be substantiated, specific, and verifiable before they're published, not defended after the fact. Once the directive applies on 27 September 2026, a claim that an event was "climate-friendly" or that a streaming format is "eco-friendly" needs a documented basis: what was measured, what assumptions were used, and what scope the claim actually covers.

For any organisation putting out a sustainability statement about a conference, summit, or internal town hall, three practical requirements follow:

• No unqualified labels. Terms like "green," "sustainable," or "climate-positive" without supporting data are exactly the kind of generic claim the directive targets.

• No absolute neutrality claims unless backed by a transparent, checkable methodology covering the full scope of what's being claimed.

• Explicit scope statements. Say whether the claim covers the whole event, only the travel component, or a single part of the production, because these numbers are not interchangeable.

This is why we've moved away from saying a livestream "reduces emissions" as a blanket statement. We say what was avoided, for whom, and how we calculated it. Organisations running public affairs campaigns, EU institutional events, or NATO-adjacent conferences, where public scrutiny of claims is already high, should expect this same standard to apply to any sustainability language in tender documents, RFPs, or post-event reporting.

Where the actual carbon reduction comes from

The climate benefit of livestreaming comes almost entirely from avoided travel, not from the streaming technology itself being emission-free. When a participant joins remotely instead of flying or driving to a venue, that specific trip's emissions don't happen. That's the mechanism, full stop.

It is not the same as saying the event produces zero emissions. A livestream still runs on cameras, encoders, switchers, networks, data centres, and viewer devices, all of which draw power and carry an emissions footprint tied to the electricity grid behind them. In our work producing livestreams for international conferences and hybrid summits, the pattern is consistent: the larger the avoided travel component (long-haul flights, multiple overnight stays, large delegations), the larger the net reduction. The smaller that travel component, the smaller the benefit, sometimes to the point where it's marginal.

This is precisely why we never claim that a livestream automatically has a lower footprint than the equivalent physical event. It depends on:

• Number of participants who would otherwise have travelled versus those attending locally regardless

• Distance travelled, since a short domestic train ride and a transatlantic flight are not remotely comparable

• Transport mode, because aviation and long-haul travel carry disproportionately higher emissions per participant than rail or local transit

• Event duration, which affects both the travel avoided (multi-day events often mean hotel stays) and the digital resources consumed

• Digital consumption, meaning stream quality, number of concurrent viewers, and length of the broadcast

Change any one of these variables and the comparison changes. A single-day domestic seminar with a mostly local audience will show a very different result than a three-day transatlantic summit between Brussels and Washington DC where half the speakers would otherwise fly in.

A transparent worked example

Here's how we'd actually construct a defensible number, using illustrative figures to show the method, not a universal constant you can copy onto every event.

Say a hybrid conference expects 150 remote participants who would otherwise have flown in for a two-day event, averaging a return flight of roughly 1,500 km. Using a general aviation emission factor in the range commonly cited by European environment agencies for short-to-medium haul flights (approximately 150-200g CO₂ per passenger-kilometre; before we apply it to a real case we always confirm the specific factor and its source year), the avoided travel component alone would run into several tonnes of CO₂ for that group.

Against that, you set the production side: the actual energy draw of the cameras, encoding hardware, streaming infrastructure, content delivery network, and the estimated device-side energy use of those 150 viewers watching for the two-day duration. This component is real but structurally smaller, because it scales with hours of viewing and data volume, not with distance travelled.

The net claim is the difference between those two figures, and it must be reported as a comparison with a stated scope, not a flat number in isolation. This is also the origin of figures we've referenced previously, including comparisons where avoided travel emissions dwarfed the streaming footprint by a large multiple. Under the incoming EU standard, any figure like that needs to be traceable back to its inputs: who travelled, how far, which emission factor, and which year's data. A number without that trail is a marketing claim, not evidence.

Choose evidence-based reporting if, skip vague labels if

Use a documented, scoped calculation when:

• You're issuing a public sustainability statement about a conference, summit, or hybrid event that stakeholders, press, or procurement teams might scrutinise

• Your organisation operates in a regulated or public-facing sector (government, EU institutions, defence, NGOs) where a challenged claim carries reputational or legal risk

• You need to report avoided emissions as part of an ESG disclosure, tender response, or public affairs communication

• You want a number you can defend line by line if a journalist, auditor, or competitor questions it

Skip the vague "green event" label if:

• You haven't actually measured participant travel patterns, distances, or transport modes for that specific event

• You're tempted to apply a single blanket percentage or multiplier across every event regardless of format, size, or audience location

• The claim would cover "the whole event" when you've only calculated the travel component, or vice versa

• You can't state which emission factor, source, and year underlies the number

How we approach this at 2 Stream

We treat every climate-related claim we make about a livestream or hybrid event the same way we treat a technical spec: it has to be checkable. When we scope hybrid formats for clients running international or transatlantic events, we separate the avoided-travel calculation from the production footprint from the start, rather than folding both into one soft "sustainable event" statement.

That approach sits behind our climate impact work, where we document how digital formats reduce the travel-related component of an event's footprint for clients running international conferences and stakeholder meetings. We apply the same logic when we help organisations weigh a hybrid event against a fully in-person format, or when a client is deciding between a webinar and an on-location broadcast to cut travel costs without cutting reach.

None of this replaces the production quality question. A defensible climate claim only matters if the stream itself performs, which is a separate conversation.

Frequently asked questions

Does livestreaming always have a lower carbon footprint than an in-person event?

No. It depends on how much travel is actually avoided. A hybrid event with mostly local attendees and a small remote audience may show only a marginal reduction, while an international summit with many long-haul travellers joining remotely instead can show a much larger one. The comparison has to be calculated per event, not assumed.

What's the difference between avoided emissions and an event's carbon footprint?

Avoided emissions are the travel-related emissions that don't occur because someone joined remotely instead of travelling. The event's carbon footprint is everything the event itself still produces, including production equipment, streaming infrastructure, data centres, and viewer devices. Reporting one without the other misrepresents the actual climate impact.

What EU rules apply to environmental claims about events from 2026?

Directive (EU) 2024/825 applies across the EU from 27 September 2026 and requires environmental claims to be specific, substantiated, and verifiable. Belgium's Federal Public Service Economy has stated that claims are considered misleading when they are incorrect, exaggerated, or cannot be checked, which directly affects how organisations can describe "green" or "sustainable" events.

How much CO₂ does an hour of video streaming actually emit?

There's no single fixed figure, because it depends on stream quality, viewer device, network type, and data centre energy source. What can be stated reliably is that this footprint is generally far smaller than a single long-haul flight avoided by a remote participant, which is why the travel-avoidance side of the calculation usually dominates the result in international event scenarios.

Can I say my hybrid event is "carbon neutral"?

Only if you have a transparent, verifiable methodology covering the full scope of the claim, including both avoided travel and remaining production emissions. Under the incoming EU standard, an unsupported "carbon neutral" label is exactly the kind of generic claim regulators are targeting, so it needs to be scoped and documented before it's published anywhere.

What variables should I measure before making a climate claim about my event?

Track the number of participants who would otherwise have travelled, the distance and transport mode for that travel, the event's duration, and the digital consumption involved (stream quality, concurrent viewers, hours broadcast). These four variables determine whether the reduction is significant or marginal, and any credible claim needs to name which of them it accounted for.

Calling an event green is easy. Showing the numbers behind the claim is what the new EU rules, and your own credibility, actually require. Once you know that the real question is what changes when people join remotely instead of travelling, you can build a claim that survives scrutiny instead of one that just sounds good. Talk to our team about scoping a defensible climate impact assessment for your next conference, hybrid summit, or international event, or get in touch to arrange a studio tour and walk through the methodology in person.

Sources

• European Union, 2024 — Directive (EU) 2024/825 on environmental claims, applicable from 27 September 2026.

• FOD Economie (Belgium), 2026 — Belgian federal guidance on identifying misleading environmental claims.