UK Emissions Have Fallen Since 1990. Why Is Transport Still the Biggest Source?

The UK’s headline decarbonisation number is genuinely impressive: territorial greenhouse gas emissions have fallen by more than half since 1990. The provisional estimate for 2024 put the reduction at around 54%; the final figures published subsequently settled at around 53%. Either way, it is one of the steepest sustained falls in any large economy. The uncomfortable detail is where that fall came from, and where it did not.

What the evidence says

• Government statistic: UK territorial greenhouse gas emissions in 2024 were around 53–54% below 1990 levels (DESNZ; provisional then final estimates).
• Government statistic: transport is the UK’s largest emitting sector.
• Zero to Green interpretation: the reductions achieved so far were concentrated in electricity supply and heavy industry, which is why the remaining task is harder, not easier.

Where the reductions actually came from

The single largest driver was the transformation of electricity supply. Coal was displaced first by gas and then, at scale, by wind and solar; the last coal-fired power station closed in 2024. Heavy industry contributed a second large tranche, partly through efficiency and fuel switching, and partly through the decline or offshoring of energy-intensive manufacturing, which is a real reduction in territorial emissions but not always a reduction in global ones.

These were, in the main, decisions taken by a small number of large operators about a small number of large assets. That is what made them tractable.

Why transport did not follow

Transport emissions have been broadly flat over the same period, which is why the sector has risen to the top of the table without doing anything differently. Several structural reasons explain this:

• The emitting assets are owned by millions of people, not a handful of firms. There is no equivalent of closing a coal plant.
• Efficiency gains were absorbed by demand. Engines became more efficient while vehicles became larger, heavier and more numerous, and distance travelled grew.
• Fleet turnover is slow. Even with rapid growth in electric vehicle sales, the average car stays on the road for well over a decade, so the fleet changes years after the sales mix does.
• Freight and aviation are hard. HGVs, shipping and aviation lack a mature, deployed low-carbon substitute at the scale required.

What this means for the next phase

The first half of the UK’s decarbonisation was, comparatively speaking, the easy half: concentrated, supply-side, and driven by a handful of investment decisions. The second half is dispersed, transport, buildings and heat, and depends on behaviour, capital cycles in households, and infrastructure such as charging and grid capacity. Progress will look less like a step change and more like a grind.

What organisations should take from it

• Look at your own profile, not the national one. If most of your footprint is grid electricity, it has been falling without you. That is decarbonisation of the grid, not of your business.
• Business travel and commuting are in scope for reporting. Both are required Scope 3 categories in a Carbon Reduction Plan under PPN 006, and both sit in the sector that has not improved.
• Fleet decisions are decade-length decisions. A vehicle purchased now will still be emitting in the mid-2030s.
• Report territorial and consumption honestly. If reductions came from changing supplier or closing a site, say so rather than presenting it as efficiency.

What we are not claiming

We are not claiming the UK is on track for any particular target, that offshoring accounts for a specified share of the reduction, or that transport emissions have risen, they have not, they have stayed broadly level while other sectors fell. Figures here are territorial emissions, which exclude emissions embodied in imported goods; consumption-based accounting tells a less flattering story and is published separately.

Sources and methodology

• Provisional UK greenhouse gas emissions national statistics 2024, Department for Energy Security and Net Zero.
• Final UK greenhouse gas emissions national statistics, Department for Energy Security and Net Zero.

The 54% figure is the provisional 2024 estimate; the final estimate is close to 53%. We have quoted both rather than choosing the more flattering one. Sector ranking is taken from the same DESNZ releases.

Last reviewed: 30 August 2026.

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