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    Home| Insights| From Runway to Net Zero: Supporting Aviation’s Climate Goals with Level 5 Verification
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    From Runway to Net Zero: Supporting Aviation’s Climate Goals with Level 5 Verification

    30th October 2025

    From Runway to Net Zero: Supporting Aviation’s Climate Goals with Level 5 Verification

    At Arthian, we’re delighted to support the professional development of our team – especially when it coincides with creating a more sustainable world in important industries such as aviation.

    Iain Forsyth, Technical Director within Arthian’s Climate & Carbon team, recently qualified as a Level 5 Airport Carbon Accreditation Verifier – the highest level of verification available for airports – as one of a handful of individuals in the UK to have achieved this distinction.

    What does it mean to be a Level 5 ACA verifier, and what does our team expect to see from the aviation industry in the coming months?

    What does it mean to be a Level 5 ACA verifier?
    As a Level 5 ACA verifier I am qualified to assess and validate the submissions to the Airport Carbon Accreditation scheme, made by airports who are often considered as leaders within the aviation sector. It’s the highest level of verification, typically involving complex airport operations and strategic emissions reductions. It reflects deep technical expertise and a strong understanding of aviation-specific carbon challenges.

    What kind of experience led you to this achievement?
    Since becoming an approved ACA Verifier in 2019, I have worked with airport clients to support their successful applications, many from entry into the programme up to their current accreditation levels. As such this experience has given great insights into the evolving nature of carbon management within airports and the aviation sector, not only through changes in approach, but also the increasing importance of accreditation.

    Airport Carbon Accreditation

    How will this role influence our work with aviation clients?
    We can now provide support across an airport’s progression through the entire ACA programme, being qualified to verify applications up to Level 5. This means that we can continue to support existing clients to reach this level, as well as provide support for new entrants coming into the programme. We can also apply our detailed knowledge and understanding of the ACA programme to support our aviation clients with their own Net Zero and carbon reduction programmes.
     

    What challenges do airports face in meeting carbon goals?
    Airports in their role as transport hubs act as an interface between many different elements of the aviation sector, and as such can help encourage and facilitate cross-departmental and organisational collaboration for decarbonisation. They do however still face challenge in being able to meet their own carbon goals
     

    A significant proportion of an airport’s environmental impact (usually between 85-90%) is associated with indirect emissions from airlines, third-party ground handlers, and as well as from the impact of passengers travelling to and from the terminal building. With no direct control over these sources, airports often have to support and influence third parties to decarbonise their operations, rely on shifts in consumer markets (particularly for passenger access), or exert commercial influence to reduce emissions.
     

    Airport expansion (driven by continued growth of the sector) and how this can be aligned into emissions reduction targets is another challenge airports are grappling with. Not only are there impacts from additional air traffic using the site, but there are increases in operational emissions (from the operation of new facilities), associated construction emissions and embodied carbon impacts from new terminal buildings. The challenge for airports is to balance the commercial and regulatory requirements which can sometimes act contrary to their own carbon goals.

    Airport Carbon Accreditation

    How do you see the aviation sector evolving in its climate response?

    The current focus of the aviation sector is on reducing emissions from the operation of aircraft, primarily through the to switch to new sustainable fuels (sustainable aviation fuel, hydrogen), moving away from traditional kerosene and aviation spirit. Partnered with ongoing improvements to engine efficiency, airframe design, and route optimisation it is hoped that this will provide a sustainable pathway towards decarbonisation.
     

    Airports have a key role to play in being able to provide supporting infrastructure and facilities to support the transition and provide these fuels. This infrastructure also includes the roll out of fixed electrical ground power (FEGP), reducing the requirement for mobile generators when aircraft are on stand, as well as supporting the uptake of electric vehicles and plant by ground handlers. Given the emissions intensive nature of the sector it is likely that offsetting programmes such as CORSIA will remain a crucial element, particularly for the removal of residual carbon emissions once reductions have been achieved.

    Accelerating Aviation’s Climate Ambitions
    Iain’s qualification as a Level 5 Airport Carbon Accreditation Verifier marks a significant milestone—not just for his professional development, but for Arthian’s ability to support the aviation sector in meeting its climate goals. As airports face increasing pressure to decarbonise amidst complex operational and regulatory challenges, having in-house expertise at the highest level of verification allows us to provide strategic, informed, and impactful support. We’re proud to be part of the journey toward a more sustainable aviation industry, one runway, terminal, and carbon reduction plan at a time.

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