Heathrow expansion incompatible with UK climate targets, report finds

Heathrow Airport's proposed third runway is incompatible with the UK's legally binding climate targets, according to a new report from the Tyndall Centre for Climate Change Research at The University of Manchester, commissioned by Friends of the Earth. The analysis indicates that the UK's aviation sector is already projected to exceed its share of the Seventh Carbon Budget (2038-42) by between 21% and 50%, even before any Heathrow expansion takes place.1

The report critically assesses the government's reliance on Sustainable Aviation Fuels (SAF) and Greenhouse Gas Removals (GGR) to offset emissions, finding these technologies are not on track to provide the necessary capacity. Dr Lois Pennington, a Research Fellow at the Tyndall Centre, stated, "Every aviation scenario the UK Government has published overshoots the carbon budget Parliament has legislated, before a third runway at Heathrow is even taken into account".

Understanding the climate impact of major infrastructure projects like airport expansion is crucial for meeting the UK's net-zero goals. At Fuse Energy, we believe in a future where abundant, clean energy makes such difficult decarbonisation challenges more achievable.

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The core conflict: Heathrow expansion vs UK climate goals

The UK has established legally binding climate targets under the Climate Change Act 2008, committing to net-zero greenhouse gas emissions by 2050. A system of five-year carbon budgets guides this path, with the Seventh Carbon Budget covering the period from 2038 to 2042. The recent Tyndall Centre report directly assesses whether Heathrow's proposed third runway can proceed without undermining these national commitments.

The Tyndall Centre report's key findings

The research, conducted by scientists at the University of Manchester's Tyndall Centre, concludes that there is no credible scenario in which Heathrow expansion can align with the UK's climate targets. The report, commissioned by the environmental justice organisation Friends of the Earth, provides a detailed analysis of the aviation sector's projected emissions against the UK's legal carbon budgets.

Overshooting the Seventh carbon budget

Even without further expansion at Heathrow, the UK's aviation sector is already projected to exceed its share of the Seventh Carbon Budget (2038-42) by between 21% and 50%. This significant overshoot highlights the existing challenge the sector faces in decarbonising, before any additional growth from a third runway is considered.

The role of non-co₂ aviation impacts

A critical aspect often overlooked in carbon budgeting is the non-CO₂ impacts of aviation. These effects, which include contrails and nitrogen oxides, account for around two-thirds of aviation's climate warming and are not fully captured within current carbon budgets. The Tyndall Centre report highlights that these should be incorporated into future climate targets.

Scrutinising decarbonisation strategies: SAF and GGR

The UK government's strategy for decarbonising aviation heavily relies on SAF and GGR to offset emissions. However, the Tyndall Centre report critically assesses the viability and scalability of these technologies within the necessary timeframe.

The reality of Sustainable aviation Fuels

SAF are seen as a key pathway to reduce aviation emissions. However, the report indicates that SAF production and deployment are not on track to provide the capacity needed to accommodate aviation growth, let alone offset existing emissions. Even optimistic deployment of this technology would leave aviation above its carbon budget share. Previous studies have also shown that current SAF production methods face major structural constraints or compete with agriculture for land and water.

Challenges with greenhouse gas Removals

GGR describe methods that remove carbon dioxide from the atmosphere and store it long-term, such as bioenergy with carbon capture and storage. While GGRs are expected to play a role in achieving net-zero across hard-to-abate sectors, the report highlights that global GGR deployment is significantly off track, and no engineered removal plants are yet operating in the UK. Despite this, aviation emissions modelling heavily relies upon future potential GGR to offset additional emissions.

Why current plans fall short

The analysis concludes that the current plans for SAF and GGR are insufficient to bridge the emissions gap created by aviation growth. Dr Lois Pennington stated that "Every aviation scenario the UK Government has published overshoots the carbon budget Parliament has legislated, before a third runway at Heathrow is even taken into account". This highlights a fundamental mismatch between aviation growth ambitions and the realistic pace of decarbonisation technology development.

Broader implications for UK climate policy

The findings of the Tyndall Centre report have significant implications for the UK's broader climate policy and its commitment to achieving net-zero emissions. Major infrastructure decisions like airport expansion must be rigorously assessed against national and international climate obligations.

Legal obligations and the climate Change act

The Climate Change Act 2008 established the UK's legally binding framework for reducing greenhouse gas emissions. This includes the commitment to a net-zero target by 2050 and the system of five-year carbon budgets. Proceeding with projects that undermine these targets could expose the government to legal challenges and compromise its credibility on climate action.

The net-zero 2050 target

The UK's commitment to achieving net-zero greenhouse gas emissions by 2050 is a cornerstone of its climate strategy. The report suggests that expanding Heathrow would make this target considerably harder to achieve, forcing deeper and more rapid cuts in other sectors or relying on unproven technologies at an unprecedented scale.

The need for systemic solutions

Reconciling aviation demand with climate targets in the long term requires more than just incremental changes. It necessitates systemic solutions that address the fundamental energy sources powering the sector. Without a transformative shift in energy systems, the perceived conflict between economic growth and climate goals will persist.

Powering a net-zero aviation future with abundant clean energy

The challenge of decarbonising aviation, as highlighted by the Heathrow expansion debate, often stems from a scarcity mindset regarding energy. However, a future powered by abundant clean energy offers a different path.

Beyond scarcity: unlocking aviation decarbonisation

The current dilemma - whether to expand aviation or meet climate targets - can be reframed by considering the potential of abundant clean energy. If clean energy is plentiful and affordable, the scalability of solutions like SAF (produced from renewable electricity) and advanced propulsion technologies becomes far more achievable. This shift moves beyond the difficult trade-offs imposed by energy scarcity, allowing for innovation and growth without compromising climate goals.

Fuse Energy's vision for a Sustainable future

Fuse Energy is committed to rebuilding the energy system from the ground up to deliver abundant, clean energy. This vision is crucial for decarbonising hard-to-abate sectors like aviation. By focusing on creating a future with "power to play with," Fuse Energy aims to unlock the scale needed for SAF and other advanced technologies. This approach ensures that sectors like aviation can achieve ambitious net-zero targets, moving beyond the scarcity narrative that often forces difficult choices between economic activity and environmental responsibility.

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References

1. University of Manchester. Heathrow expansion incompatible with UK legal climate targets, major report finds