How bad are aviation emissions?

Post updated October 2026

You might have heard airlines saying that aviation is responsible for just 2% of global emissions, therefore we shouldn’t worry about it.

But is that correct? Just how bad are aviation emissions?

2% is a low estimate

Compared to other industries, such as concrete (8%) or animal agriculture (15%), 2% sounds low. ICT (data centres, telecom networks and personal devices) alone accounts for around 4% of global emissions.

It’s a convenient argument for airlines, the industry, and even passengers. If aviation is only responsible for 2% of global emissions – much lower than other industries – then why should we worry about flying?

But there are other factors to consider when we talk about aviation, and analysis suggests we’ve been downplaying aviation’s impact. Some sources suggest a more accurate figure is 3.5%. Some say 4%.

This is because radiative forcing – the extra warming effect of greenhouse gases in the upper atmosphere – increases aviation’s contribution to global emissions. Much of this is down to contrails forming, which act like a blanket over the earth. Some studies show that contrails alone can double to triple aviation’s impact upon the environment.

CO₂ lasts for centuries in our atmosphere, so some argue that putting it directly into the upper atmosphere does much more harm than the same emissions do at ground level.

Whichever way you look at it, it’s clear that aviation’s contribution to global emissions and global warming is higher than the 2% from CO₂ alone.

Only a few people access aviation

Even 3.5% or 4% of global emissions seems low, though. But it’s not because aviation emissions are low. It’s because, globally, very few people fly – only around 10% in any given year. A very small proportion of the world’s population flies, making aviation’s overall contribution small when you compare it to other industries.

UK emissions from flights

In the UK, aviation emissions make up around 8% of our national annual emissions. This is in comparison to 26% for road and other transport, 19% for buildings, 11% for agriculture, 10% for electricity, and 5% for waste*.

The majority of aviation emissions come from just a small proportion of people – the so-called ‘frequent flyers’. A 2014 government survey showed that 15% of people took 70% of the flights. (It might be surprising to know that to count in that 15%, you only need to take three return flights per year, which probably doesn’t feel very frequent for most people).

Even here in the UK, half of us don’t fly in any given year. So for 8% of our annual emissions to come from something that half of us don’t do – as opposed to 11% for agriculture which serves a much greater proportion of people – shows that aviation emissions are more significant than we might assume.

*territorial emissions don’t include aviation, so these figures are adjusted from the government source to include international and domestic aviation.

If we all flew…

If everyone in the world took as many flights as the most frequent flyers, global aviation would emit more than 42.5 billion tonnes of CO₂ per year – more than twice the current total global CO₂ emissions.

Even if everybody took ‘just one flight’, aviation emissions would make up 22 billion tonnes per year. They are currently 1 billion tonnes.

Our impact as individuals

Looking at the individual level, we see where emissions from flights can really start to dominate. For people in the ‘frequent flyer’ category, emissions from flights could make up half or more of overall emissions.

Depending on where you’re flying to, one flight could equal a year’s worth of emissions from an activity like driving.

Here are some figures for comparison:

• Heating your home for a year: 2.5 tonnes CO₂ = a return flight to Buenos Aires (2.6 tonnes CO₂)
• Eating meat for a year: 2.06 tonnes CO₂ = a return flight to Maldives (2.01 tonnes CO₂)
• Driving a car for a year: 1.98 tonnes CO₂ = a return flight to Las Vegas (1.96 tonnes CO₂)

All flight emissions data is from flightemissionmap.org, accurate at time of publication

Another way to look at it is that flights wipe out the savings you might have made through making an effort in other areas – for example, following a vegan diet, or driving less.

Recommended ‘sustainable’ footprint

In 2018 the IPCC recommended that each person in the world should limit their emissions to 2.3 tonnes in total. Most people are currently below that, but here in the West and in the UK our per-capita emissions are much higher. The government estimate from 2023 is 10 tonnes CO₂ per person.

If we are to reduce those emissions to sustainable levels, we need to address every area of our lives. In the UK, most of the recommended 2.3 tonnes will be used up by the things we need to do to live, like eat and heat our homes. After that, there’s very little room left for flights. 

Moving to a low-carbon society means cutting out non-essential sources of emissions, and for most people, that’s flights.

Calculations for chart (all sources accessed October 2026):

• Flight emissions from flightemissionmap.org
• Heating emissions from renewableenergyhub.co.uk/main/heat-pumps-information/co2-carbon-savings-of-a-heat-pump-and-their-environmental-cost
• Average meat consumption in the UK = 85g per day, 85g meat per day generates 5.63kg CO2, x 365 = 2.06 tonnes per year
• Driving emissions = 7,100 average mileage (RAC dev.racfoundation.org/motoring-faqs/mobility#a32), x 0.28 (kg CO2e of average car in the UK from Government emissions figures 2026)
• Lightbulb emissions from energysavingtrust.org.uk/advice/lighting

________

If you are inspired by this post please share it, consider taking the Flight Free Challenge, or donate to Flight Free UK