Is flying really that bad for the climate? Yes, and it is worse than the carbon figure suggests.
Most of us grew up taking flying for granted, at least those of us lucky enough to live where cheap air travel is normal. We have built busy lives around the freedom to hop on a plane whenever our schedules and our bank balances allow, and most of us love to travel. Then the climate crisis came along and complicated things.
Here is the part we are rarely told. Long after our holiday photos fade, the gases from our flights linger in the atmosphere, a hangover from the trip that keeps warming the planet for centuries. Flying is one of the most carbon-intensive things many of us do. And the carbon is only part of it.
So let us break the problem down. Each piece is worrying on its own. Put them together, and we get what experts call a “wicked problem”: one where the causes tangle together, the goalposts keep moving, and there is no single, clean fix.
How bad is flying for the climate?
Aviation accounts for about 2.5% of global CO2 emissions, but its full warming impact is likely around double that once contrails and other non-CO2 effects are accounted for.
Aviation’s carbon emissions are bigger and rising faster than the “2.5% of global emissions” line suggests. In a flying nation like the UK, flying is on track to be the single largest-emitting sector by 2040, while only about 11% of the world’s people fly in any given year.
Burning jet fuel not only releases carbon. Aircraft also create contrails, the white trails you see behind a plane, and these trap heat. Together with the other non-carbon effects, they roughly double the warming of a flight.
Here is the frustrating part: contrails may be the cheapest, fastest climate problem in all of aviation to fix. But it is not being done.
Within 20 years, there will be roughly twice as many planes in the sky and more than twice as many passengers.
Even as the science says we need to fly less, airports almost everywhere are racing to get bigger. Every new runway locks in decades of more flights and emissions, and the people who will pay the highest price are so often the ones who will never fly.
Who’s really causing it?
The damage from flying isn’t shared evenly. Behind most of it sit a small group of frequent flyers, and an industry designed to keep them in the air. Here’s who’s really causing it
A small minority causes most of aviation’s climate damage. About 1% of the world’s people cause roughly half of flying’s emissions, while around 80% have never flown at all.
Airline loyalty schemes reward one thing above all: flying more, in the highest-carbon seats. They are quietly designed to turn ordinary travellers into frequent flyers, but it’s a game you can choose to opt out of.
Why isn’t it being fixed?
Because nothing is forcing it to: jet fuel goes untaxed, the industry lobbies hard against any new rules, and the “solutions” airlines sell aren’t working. Emissions are still going up, not down.
Aviation escapes rules that apply to almost everything else. Most of its emissions officially belong to no country, and its fuel is barely taxed. These loopholes keep flying artificially cheap and hard to hold to account.
Airlines say they are committed to net zero, then lobby hard against the very rules that would get us there.
93% of us want to travel more sustainably, but knowing how is the hard part. Airlines have spent years trying to convince us that flying itself is sustainable. Of course, we want to believe them and to be able to fly guilt-free. But we are being misled.
