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Transport
Strategy in development
Key Drivers Analysis
International air travel accounted for 91% of total transport emissions, making delegate travel to Southampton the dominant source of the conference's carbon footprint. With 541 participants traveling from multiple countries across Europe, Asia Pacific, Americas, and Middle East, the average flight distance significantly contributed to the overall emissions profile. The Gala Dinner's location on the Isle of Wight added local ferry and bus transport requirements for all attendees.
Emission Factors Source
All emission factors used in this report are sourced from the official UK Government greenhouse gas conversion factors for company reporting.
View DEFRA 2025 Conversion FactorsData Transparency
For full transparency and audit purposes, the complete raw participant data used in this report is available for download and review.
View & Download Raw DataData Quality & Methodology
This report is based on 460 valid entries out of 541 total registrations. Emissions for 81 incomplete entries have been extrapolated using the average emission profile of valid participants. All calculations use emission factors from DEFRA 2025 guidelines and are subject to audit verification.
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Methodology & Assumptions
Transport emissions are calculated based on delegate-reported travel modes and distances. Return journeys are assumed for all delegates. Emission factors are sourced from DEFRA 2024 conversion factors.
- •International flights: undefined kg CO2e/passenger km
- •Domestic UK flights: 0.22928 kg CO2e/passenger km
- •National Rail: 0.03546 kg CO2e/passenger km
- •Average Car: 0.17304 kg CO2e/km
- •Local Bus: 0.10385 kg CO2e/passenger km
- •Ferry: 0.01871 kg CO2e/passenger km
- •Coach: 0.02776 kg CO2e/passenger km
- •All distances are one-way; return trips are calculated as 2x distance
Delegate Travel (Home to Southampton)325.97 t CO2e
~333 delegates • Avg 3,037 km one-way
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~106 delegates • Avg 2,004 km one-way
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~45 delegates • Avg 820 km one-way
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~29 delegates • Avg 773 km one-way
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Local Transport (Organizer Arranged)0.82 t CO2e
Transport arranged by conference organizers for all 541 attendees from Southampton to Isle of Wight venue.
Ferry: Southampton → Isle of Wight
Return trip: 38.4 km (19.2 km each way)
Factor: 0.01871 kg CO2e/passenger km
Coach: IoW Port → Gala Dinner
Return trip: 28.8 km (14.4 km each way)
Factor: 0.02776 kg CO2e/passenger km
Emissions by Region
~102 delegates
243.19 t CO2e
~276 delegates
61.67 t CO2e
~8 delegates
11.80 t CO2e
~7 delegates
6.55 t CO2e
~147 delegates
2.76 t CO2e
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Methodology & Assumptions
Accommodation emissions are calculated based on the number of hotel nights reported by delegates. The emission factor represents average UK hotel energy consumption including heating, lighting, and amenities.
- •Emission factor: 10.4 kg CO2e per room per night
- •Based on average UK hotel energy intensity
- •Includes electricity, heating, water, and amenities
- •Assumes single occupancy rooms
nights booked
nights per person
kg CO2e/room night
Note: Accommodation data is based on delegate self-reporting. The 4-day conference (15-18 September 2025) typically requires 3-5 nights of hotel stay depending on travel arrangements.
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Methodology & Assumptions
Venue energy emissions are estimated based on typical electricity consumption for conference facilities of similar size. The UK grid emission factor is applied to all electricity usage.
- •UK Grid emission factor: 0.17700 kg CO2e/kWh (2025)
- •4-day conference duration
- •Estimates based on 500-person conference venue benchmarks
- •Includes conference halls, exhibition areas, and common spaces
Conference halls and common areas
1,200 kWh
Heating ventilation air conditioning
3,500 kWh
Projectors screens sound systems
800 kWh
Kitchen and food service equipment
600 kWh
WiFi servers charging stations
400 kWh
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Methodology & Assumptions
Food emissions are calculated based on meal types, dietary choices, and typical emission factors for catering services. Food waste is estimated at 15% of total food emissions.
- •Meat-based meals: 2.5-8.0 kg CO2e per serving (varies by meal)
- •Vegetarian meals: 1.2-3.5 kg CO2e per serving
- •Vegan meals: 0.8-2.0 kg CO2e per serving
- •Food waste: 15% of total food emissions
- •Local sourcing reduces emissions by 10-20%
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Methodology & Assumptions
Materials emissions are calculated based on item weights and material-specific emission factors. Recycling provides a negative emission offset. General waste and food waste are estimated based on conference duration.
- •541 delegate packs including badges, programs, and bags
- •Recycling offset: -0.2 kg CO2e/kg recycled material
- •Exhibition materials estimated per booth
- •Waste volumes based on 4-day event benchmarks
541 pieces • 27.1 kg • 80% recyclable
t CO2e
541 pieces • 10.8 kg
t CO2e
541 pieces • 162.3 kg • 60% recyclable
t CO2e
2,000 pieces • 20.0 kg • 95% recyclable
t CO2e
50 pieces • 100.0 kg • 70% recyclable
t CO2e
30 booths • 450.0 kg • 50% recyclable
t CO2e
4 days • 600.0 kg
t CO2e
4 days • 800.0 kg • 100% recyclable
t CO2e
4 days • 400.0 kg
t CO2e
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Methodology & Assumptions
Digital emissions are calculated based on server energy consumption, data transfer, and device usage estimates. Emission factors are derived from studies on ICT carbon footprint.
- •Live streaming: 0.036 kg CO2e per viewer hour
- •Video recording: 0.055 kg CO2e per session hour
- •Cloud storage: 0.0001 kg CO2e per GB per hour
- •Conference app: 0.008 kg CO2e per user hour
- •Website traffic: 0.0002 kg CO2e per visit
Mobile app usage by attendees • 541 users
t CO2e
Conference materials and recordings • 30 GB
t CO2e
Pre and post conference emails • 5,000 emails
t CO2e
t CO2e
Note: Digital emissions represent a small fraction of total conference emissions but are included for completeness. These estimates support potential future optimization of virtual conference elements.
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Methodology & Assumptions
Emissions are calculated from valid participant data and extrapolated to account for incomplete entries. The extrapolation assumes invalid entries have similar travel patterns to valid entries.
- •Total registrations: 541
- •Valid entries with complete data: 460
- •Invalid/incomplete entries: 81
- •Extrapolation factor: 1.1761
Emission Factors Source
All emission factors used in this report are sourced from the official UK Government greenhouse gas conversion factors for company reporting.
View DEFRA 2025 Conversion FactorsRaw Data Access
For full transparency and audit purposes, the complete raw participant data used in this report is available for download and review. This includes all valid and invalid entries with their respective travel modes and distances.
View & Download Raw DataData Validity Overview
Invalid Entry Breakdown
Methodology
1. Data Validation: Each participant entry is validated for: origin location, distance value > 0, and transport mode.
2. Raw Calculation: Emissions are calculated only from the 460 valid entries using the provided emission factors.
3. Extrapolation: To account for the 81 participants with incomplete data, we apply a linear scaling factor of 1.1761.
4. Assumption: We assume that participants with missing data have similar travel patterns (distribution of transport modes, distances, and accommodation nights) as those with complete data.
Raw vs Extrapolated Emissions
Extrapolation Formula
Extrapolation Factor = Total Participants / Valid Participants
= 541 / 460 = 1.1761
Extrapolated Emissions = Raw Emissions × Extrapolation Factor
= 293.62 × 1.1761 = 345.32 tonnes CO2e
Caveats & Limitations
- This extrapolation assumes missing data follows the same distribution as valid data
- Local transport (ferry + bus) is calculated for all 541 participants
- Accommodation extrapolation uses average nights per valid participant
- Some invalid entries may be local participants who did not travel internationally
Based on 460 complete entries
Scaled to all 541 participants