Heathrow Airport Holdings Limited owns and operates Heathrow, London's largest airport, which handled 84.5 million passengers in 2025.
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Heathrow's own operational emissions fell slightly, but its total reported footprint rose year on year and is 7.7% below 2019. Cruise and supply-chain emissions are rising. The UK Climate Change Committee says a third runway, which would add about 4.4 Mt CO2 a year, has no credible pathway within UK climate commitments under current policy. Water and waste goals are rated as needing more work.
Heathrow Airport scores 41/100 (Below expectations) on SINK's independent climate assessment, scored from public data only. Fees pay for the review, never the result. Last verified October 2026.
That places Heathrow Airport joint 343rd of 847 companies scored, and 1st of 2 in Airports / Transport Infrastructure.
Heathrow Airport is the highest-scoring airports / transport infrastructure company we've rated.
Among the 2 major airports / transport infrastructure brands we've scored, Heathrow Airport sits 1st of 2.
Its three lowest-scoring questions, and what the evidence didn't show.
Only 7.7% below 2019 baseline, which predates pandemic traffic collapse.
No water-reduction target met.
New Resources and Waste Strategy (2025) sets quantified targets to 2035, but 2030 waste goal rated 'More work to do'.
A score changes when the evidence does. We use new published evidence at the next rescore. Evidence that isn't public can count through an evidence review.
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Get in touch →Strongest on Carbon Footprint — Operations and Carbon Footprint — Supply Chain (8/10, 7/10). Weakest on Emissions Trajectory and Water Impact (2/10, 4/10).
Heathrow Airport leads its sector. This is the next company down.
See the full Airports / Transport Infrastructure table →The formula and all 17 sources.
Same ten questions for every company. No private weighting.
SINK = (0.3 × Base + 0.7 × Performance) × Scale17 sources used in this assessment. All publicly available. Each row shows which of the ten questions it informed.
13 of 17 sources are independent of the company.
“Total scope 1 greenhouse gas emissions(2) 26,998 32,116 28,054 26,681”
“£3,623m”
“stem from Scope 3 emissions (from airlines), which are outside Heathrow’s direct control.”
“Around half of aviation emissions in 2025 resulted from use of Heathrow airport”
“Heathrow currently manages approximately 170 hectares of land across 13 biodiversity sites for nature conservation purposes.”
“The tower has been created to raise awareness of Heathrow's Nature Positive Plan”
“five rivers would need to be diverted, hundreds of homes demolished, and a tunnel built under the M25”
“a 15% cut in ‘in the air’ carbon emissions by 31 December 2030, compared to a 2019 baseline”
“It is the first airport to achieve the accreditation with SBTi’s updated standards.”
“Heathrow is the first airport to achieve this status with SBTi’s updated 1.5 degrees standard.”
“Historically, periods of cold weather have been followed by fungal blooms and linked to the use of glycol as a de-icer at the airport.”
“Carbon emissions from flights at Heathrow in 2025 had fallen to 7% below 2019 levels”
“Heathrow's on the ground carbon emissions dropped by 18%, but the supply chain carbon emissions had risen by 16%.”
“Our sustainability strategy openly acknowledges Heathrow’s environmental, social, and economic impacts (both positive and negative).”
“there is no credible pathway for Heathrow expansion within the UK s climate commitments under current policies.”
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Heathrow Airport Holdings Limited owns and operates Heathrow, London's largest airport, which handled 84.5 million passengers in 2025. It runs the terminals, runways and airfield services and is a major hub for UK international aviation and cargo. The group is privately owned; revenue was £3.6 billion in 2025, with about 8,100 staff.
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