Decarbonizing Dublin Airport: A Monumental Challenge for Irish Aviation

Dublin Airport is poised for significant expansion, with the lifting of its 32 million passenger cap potentially allowing up to 40 million passengers annually by 2026 [1]. However, this growth presents a substantial challenge to Ireland’s climate goals. Decarbonizing aviation, already one of the most demanding sectors to address, will require immense resources and difficult trade-offs, according to a recent analysis from University College Cork (UCC) [1].

The Scale of the Problem

Aviation accounted for 6% (3.3 million tonnes) of Ireland’s total emissions in 2024, equivalent to roughly half of all emissions from power generation [1]. Dublin Airport is responsible for approximately 85% of these aviation emissions. With passenger numbers expected to rise, emissions linked to the airport are projected to increase by 22% by 2031, equaling the emissions from heating around 250,000 Irish homes [1]. Unlike road transport and electricity generation, there are currently no commercially viable alternatives to fossil jet fuel.

Decarbonization Pathways: Land and Power Requirements

UCC researchers explored four potential approaches to decarbonize Dublin Airport’s emissions, focusing on the land and energy demands of each [1]. These pathways fall into two main categories: replacing fossil fuels with lower-carbon alternatives and continuing to use jet fuel while removing carbon dioxide from the atmosphere.

Replacing Fossil Fuels

• Bio-SAF (Sustainable Aviation Fuel): Producing enough bio-SAF domestically could require between 0.4 and 1 million hectares of land – 9% to 21% of Ireland’s agricultural land [1]. Utilizing waste-based fuels offers a solution to land pressure, but resources are limited. diverting all used cooking oil in Ireland would only cover 0.5% of the airport’s jet fuel needs.
• Synthetic Fuels (e-SAF): Replacing jet kerosene with e-SAF would require approximately 42 TWh of electricity – 15% more than Ireland’s total electricity demand in 2024 (36 TWh) [1]. This would necessitate building 16 GW of fresh onshore wind capacity or 43 GW of solar, significantly exceeding current capacity. The renewable infrastructure alone would require approximately 71,000 hectares of solar farms or 78,000 hectares of wind farms.

Continuing Fossil Fuel Use with Carbon Removal

• Direct Air Capture (DAC): Offsetting Dublin Airport’s annual emissions using DAC would require around 5.7 TWh of electricity per year – 15% of national electricity use [1]. Current global DAC capacity is minimal, and scaling up to offset the airport’s emissions would require approximately 80 plants the size of the largest currently operational facility.
• Afforestation (Tree Planting): Offsetting Dublin Airport’s emissions could require between 0.3 to 1.6 million hectares of new forestry – 6% to 34% of Ireland’s agricultural land [1]. This is in addition to existing afforestation targets, which are already being missed. Afforestation is also a gradual and uncertain process, vulnerable to environmental factors.

Challenges and Considerations

The UCC analysis emphasizes that there is no easy or land-free pathway to decarbonizing aviation. Each approach carries significant implications for land use, electricity demand, and infrastructure development. Demand management – reducing the number of flights – will likely be necessary alongside technological solutions. Decarbonizing aviation will compete with other sectors for essential resources. The financial and physical costs of decarbonization are largely absent from public debate regarding airport expansion.

Getting to Cork from Dublin Airport

For international students and travelers arriving at Dublin Airport, onward travel to cities like Cork is readily available. Citylink operates a bus service from Dublin Airport Zone 10 to Cork Alfred Street hourly [3]. University College Cork is easily accessible from Dublin Airport [2].

If Ireland is serious about aligning aviation with its climate goals, a comprehensive conversation about resource allocation and the trade-offs inherent in different decarbonization strategies is crucial, especially as airport capacity expands.