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Insight: Is Defra 2025 accurate enough?

The latest UK greenhouse gas statistics are out, sitting quietly on a departmental server, and you've probably not even noticed.

Insight: Is Defra 2025 accurate enough?
D
Duncan Smith
10 Feb 2026
3 min read

The latest UK greenhouse gas statistics are out, sitting quietly on a departmental server, and you've probably not even noticed. Luckily, we're on the case already, and - predictably perhaps - they tell a story we already know. But with a few numerical realities that are difficult to ignore.

For one, transport remains the stubborn anchor of the climate transition. While the rest of the UK's sectors have managed to cut their emissions in half since 1990, domestic transport has shaved off a mere twelve percent. It is the sort of institutional inertia that makes you wonder if we are actively managing a transition, or just waiting for the fleet to slowly age out on its own.

The Lockdown Mirage

We had a brief, involuntary glimpse of a cleaner world in 2020 . People stayed indoors, the roads emptied, and emissions plummeted. It was an extreme experiment in demand reduction. Predictably, the moment the doors unlocked, the engines started back up. By 2022, domestic transport emissions crept back up to 113.2 million tonnes of carbon dioxide equivalent, a two percent rise from the previous year. We are currently sitting ten percent below the 2019 pre-pandemic baseline. That sounds vaguely like progress until you remember it took a global standstill to get us there, rather than any profound systemic change.

Rubber on Tarmac

When we discuss transport emissions, we are mostly talking about asphalt. Road vehicles account for an overwhelming eighty-nine percent of all domestic transport pollution. Cars and taxis alone are responsible for more than half of that footprint, while heavy goods vehicles and light vans split the rest of the damage fairly evenly. It is deeply convenient to point fingers at heavy industry or agricultural methane, but the statistical reality is parked in our driveways. The data leaves very little room for creative accounting. The core issue is the daily commute and the endless fleet of vans dropping cardboard boxes at our front doors.

The Departure Lounge

Then there is the matter of leaving the island. The government officially leaves international aviation and shipping off the primary domestic balance sheet, adhering to UN territorial guidelines. It is a highly convenient accounting mechanism. When you factor those flights back into the transport totals, the narrative shifts sharply. International aviation emissions more than doubled in 2022. That single rebound was responsible for nearly ninety percent of the entire increase in the UK's total transport emissions that year. We saved a fraction of carbon at home, and then immediately spent it flying somewhere warmer.

A Rounding Error

The provisional estimates for 2023 suggest a one percent drop in domestic transport emissions. A single percent is technically a reduction, but it is hardly the velocity required to overhaul a failing ecosystem. It is the absolute bare minimum of a rounding error masquerading as a downward trend. We are technically moving in the right direction, just at the exact speed of rush hour traffic. Would you like me to pull the comparative data on how the energy supply sector managed its fifty percent drop, or should we stick to the roads?

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