Event planners typically prioritize cost, convenience, and efficiency when arranging ground transportation. However, understanding how transportation impacts an event's carbon footprint can help achieve sustainability goals while maintaining—or even improving—attendee experience and reducing expenses.
Three Key Sustainability Factors
Transportation sustainability depends on:
- Distance traveled
- Passenger occupancy (passenger-miles per vehicle)
- Power efficiency (emissions per passenger-mile, which improves as occupancy increases)
Transportation Mode Comparison
Public Transportation
Emissions: 0.17 lbs CO₂/passenger-mile (rail); 0.39 lbs CO₂/passenger-mile (bus)
- Represents the most cost-effective and sustainable option where available
- Services operate regardless of usage, so utilizing existing infrastructure avoids additional emissions
- Dedicated transit lanes/tracks typically avoid traffic congestion, saving time
- Venue partnerships with transit agencies can reduce costs and encourage ridership
- Examples include the "Billie Car" partnership at SAP Center in San Jose and the Philadelphia Eagles' SEPTA collaboration
Shuttles
Emissions: 0.15 lbs CO₂/passenger-mile
- Data-driven scheduling maximizes occupancy and cost-effectiveness
- Fuel consumption remains constant regardless of riders, making high occupancy critical
- The Hollywood Bowl Park and Ride demonstrates effective shuttle implementation
- Bonus networking or entertainment value makes transit part of the event experience
- Partner with companies offering emissions offsets or electric fleets
- Caution: Adding shuttles where attendees would otherwise walk or use public transit increases overall emissions
Personal Vehicles
Emissions: 0.47 lbs CO₂/passenger-mile
- Generate higher emissions than most alternatives
- Incur rental fees, insurance, fuel, and parking costs
- Traffic can compromise convenience
- Carpooling reduces per-passenger emissions
- Event organizers can facilitate ridesharing through event apps or registration data analysis
- Incentivize carpooling through preferential parking for carpool and EV vehicles
Rideshare/Taxi Services
Emissions: 0.5+ lbs CO₂/passenger-mile
- Despite convenience appeal, research indicates rideshare services may "emit up to 69% more greenhouse gases than the single-passenger trip it replaces"
- Often operate as single-occupant trips despite the name
- Generate excess emissions from deadheading (empty miles) and driver idling
- Encourage pooled rideshare options and EV selections
- Organizers can discourage usage through communication strategies and inconvenient pickup zones
Implementation Strategy
According to Honeycomb Strategies' sustainability manager Eric Shaphran, "attendees are the lifeblood of the events industry. Given the impact that each person can have via their travel, integrating solutions to make their journey more sustainable can pay huge dividends for the carbon footprint of an event."
Event organizers and venues can implement changes that benefit attendees while reducing emissions. Developing new partnerships or transportation systems positions events as sustainability leaders.
