Aviation contributes to approximately 2% of global carbon emissions, with airports playing a significant role. While much attention is often focused on aircraft emissions, airports themselves are significant sources of carbon output due to their energy-intensive operations. The electricity needed to power terminals, HVAC systems and emissions from ground vehicles all contribute to the overall environmental impact of aviation. One way to contribute to a more sustainable aviation industry is through carbon accreditation for airports. This is offered through programmes like the Airport Carbon Accreditation (ACA) which provides a framework for managing and reducing an airport’s carbon footprint. This approach helps airports demonstrate their commitment to sustainability, with each certification level representing a milestone in carbon management backed by evidence.
Understanding the ACA Framework
The ACA programme is the aviation sector's most authoritative carbon management certification system. Seven distinct tiers mark the progression towards a Net Zero airport:
- Level 1 - Mapping: Establishes scientific baseline through carbon footprint measurement.
- Level 2 - Reduction: Documents active carbon management and quantifiable reductions.
- Level 3 – Optimisation: Broadens scope to encompass stakeholder carbon initiatives.
- Level 3+ - Neutrality: Demonstrates carbon neutral operations for direct emissions.
- Level 4 - Transformation: Aligns reduction targets with Paris Agreement parameters.
- Level 4+ - Transition: Addresses remaining emissions through verified offset mechanisms.
- Level 5: Achieves Net Zero status for Scope 1 and 2, whilst tackling Scope 3 emissions.
Each carbon assessment undergoes thorough verification against ISO 14064 standards, ensuring consistency across global airport operations. This verification examines emission sources, management systems and reduction initiatives with meticulous attention to detail. The programme's strength lies in its collaborative foundation. Successful carbon reduction demands active partnership between airports and their operational ecosystem - airlines, ground handlers, cargo specialists and transport providers. This unified approach delivers measurable carbon reductions across the entire value chain.
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The Business Case for ACA
As of 2024, over 600 airports worldwide participate in the ACA programme, representing 53.4% of global air passenger traffic. This highlights its growing adoption as a benchmark for sustainable airport operations. Key Benefits of ACA certification includes:
Enhanced Brand Reputation:
Certification positions airports as leaders in sustainable aviation, attracting eco-conscious passengers and businesses.
Economic Savings:
Implementing renewable energy solutions and improving efficiency can significantly lower operating costs.
Regulatory Readiness:
ACA provides a structured pathway to comply with future aviation regulations, mitigating the risk of non-compliance penalties.
Access to Funding:
Many governments and international organisations provide financial incentives to certified airports as part of broader decarbonisation efforts.
Best Practices for Implementing ACA
Implementing ACA requires a strategic and collaborative approach to ensure success. Best practices focus on establishing a clear baseline for carbon emissions, setting measurable goals and integrating sustainable technologies while engaging stakeholders across the ecosystem.
Baseline Assessment:
- Map the airport’s current carbon footprint.
- Use tools like the Airport Council International (ACI’s) Airport Carbon and Emissions Reporting Tool (ACERT).
Set Clear Targets:
- Define measurable goals for carbon reduction aligned with ACA guidelines.
- Focus on immediate improvements (e.g., upgrading lighting systems).
Engage Stakeholders:
- Collaborate with airlines, ground transport providers and energy suppliers.
- Create incentive programmes for partners to adopt eco-friendly practices.
Integrate Energy Efficient Options:
- Invest in renewable energy, such as solar or wind power.
- Upgrade HVAC systems and switch to energy-efficient LED lighting.
Monitor and Report:
- Track progress and report emissions data transparently.
- Use ACA’s detailed framework to maintain compliance.
The Bottom Line
Achieving carbon accreditation for airports is a crucial strategy for long-term aviation sustainability. The benefits of airport decarbonisation encompass compliance and an enhanced reputation and resilience against future regulatory shifts. With global aviation facing increasing scrutiny for its environmental impact, programmes like the ACA provide a structured, effective pathway to achieving necessary decarbonisation goals for the industry. Our airport sustainability services is designed to deliver a strategic approach to analysing your airport on the pathway to achieving Net Zero.