Carbon offsetting is one of the most discussed -- and most misunderstood -- tools available to event organisers. Done well, it can compensate for emissions that you genuinely cannot reduce further. Done badly, it's greenwashing that undermines your credibility and does little for the climate. Here's how to approach offsetting responsibly.
Reduce first, offset second
This is the fundamental principle. Offsetting should never be a substitute for reducing your emissions. It should be the final step after you've done everything practical to minimise your event's carbon footprint through energy efficiency, renewable power, sustainable transport, waste reduction, and responsible catering.
Think of it as a hierarchy: avoid emissions where possible, reduce those you can't avoid, and offset only the remainder. An event that offsets everything while making no effort to reduce is engaging in greenwashing, and audiences are increasingly savvy enough to spot the difference.
Step 1 -- Measure your emissions
You cannot offset what you haven't measured. A carbon footprint assessment quantifies the greenhouse gas emissions associated with your event across all significant sources. For most events, the key categories are audience travel, energy and power, waste, catering, and supply chain logistics.
Julie's Bicycle's Creative Green Tools provide free, sector-specific carbon calculators for the UK creative industries. Their event calculator walks you through the main emission sources and produces a total footprint estimate. For more detailed assessments, environmental consultancies can conduct bespoke carbon audits.
Be comprehensive in your measurement. A footprint that only counts energy but ignores audience travel (which typically accounts for 60-80% of total emissions) will significantly underestimate your actual impact and lead to inadequate offsetting.
Step 2 -- Choose credible offset projects
The carbon offset market has grown rapidly, and quality varies enormously. Credible offset projects must meet several criteria to be genuinely effective.
Additionality -- the emission reductions would not have happened without the offset funding. A forest that was already protected doesn't qualify, because it would have existed regardless of your purchase.
Permanence -- the carbon reductions must be lasting. Tree-planting projects carry a risk of impermanence if the trees are later felled or burned. Projects that prevent fossil fuel extraction or destroy greenhouse gases are generally more permanent.
Verification -- an independent third party has verified that the claimed emission reductions are real and accurately quantified. The main certification standards are Gold Standard, Verified Carbon Standard (Verra), and Plan Vivo.
No double counting -- the emission reductions are not being claimed by anyone else. This is increasingly important as countries implement their own carbon accounting under the Paris Agreement.
Types of offset projects
Offset projects fall into several categories, each with different characteristics.
Renewable energy projects fund the construction or operation of wind, solar, or hydroelectric installations that displace fossil fuel generation. These are well-established and generally reliable, though additionality is sometimes questioned as renewable energy becomes commercially viable without offset funding.
Energy efficiency projects fund improved cookstoves, insulation, or industrial efficiency measures in developing countries. These often have strong co-benefits for local communities, including health improvements and cost savings.
Forestry and land use projects include tree planting (afforestation), preventing deforestation (REDD+), and restoring degraded land. These projects can be highly effective but carry permanence risks. UK-based tree planting through organisations like the Woodland Trust is popular with event organisers because it's tangible and local.
Methane capture projects collect methane from landfills or agricultural waste and either burn it (converting it to less potent CO2) or use it to generate energy. These are highly additional and permanent.
How much does offsetting cost?
Offset prices vary widely depending on project type, quality, and certification standard. As a rough guide, Gold Standard offsets currently cost £10-25 per tonne of CO2. For a 1,000-person outdoor event producing approximately 100 tonnes of CO2, that's £1,000-2,500 -- or roughly £1-2.50 per attendee.
Some events absorb this cost into their operating budget. Others add a small "green levy" to ticket prices, with clear communication about what it funds. Transparency is key -- if you're charging attendees for offsetting, tell them exactly where the money goes.
Avoid the greenwashing trap
Offsetting becomes greenwashing when it's used as a badge without genuine commitment to emission reduction. To maintain credibility, be transparent about what you've measured and offset. Publish your carbon footprint data. Explain what reduction measures you've implemented alongside offsetting. Use credible, certified offset projects and name them specifically. Never claim to be "carbon neutral" if you haven't measured comprehensively.
A Greener Festival's accreditation programme assesses carbon management as part of its overall evaluation, providing a credible external endorsement of your efforts.
A practical approach
For most event organisers, a pragmatic approach works best. Measure your footprint using Julie's Bicycle tools, implement the reduction measures that are practical for your event, offset the remainder through Gold Standard or equivalent projects, and communicate openly with your audience about what you're doing and why.
Every aspect of your event contributes to its carbon footprint, including ticketing. Digital tickets through Tickts eliminate paper production, printing, and postal emissions -- small numbers individually, but they add up across thousands of attendees.
