I don’t work in commercial aviation any more, but can offer a few pointers
Eurocontrol are exactly the people you want taking this seriously—they regulate European airspace. So whilst I think it probably is neglected relative to other climate proposals in terms of funding vs estimated impact, it may not be neglected by the right people.
For related reasons, I think it’s way more tractable than most interventions: changing altitude under certain conditions is a lot easier than dissuading people from flying or consuming. And there is an established track record of regulators enforcing environmental rules and costs like noise restrictions and NOx emissions charges (along with sticks governments haven’t beat them with yet like carbon taxing jet fuel)
On the other hand it seems like it’s actually true the current state of scientific consensus hasn’t resolved the important question of when and where to divert yet (see the variability factors in your infographic) and the diversion usually does result in increased fuel burn (and some contrails are even cooling!) And flight directions are a complex multidimesional problem
Airspace controllers will need to be involved because airlines are unlikely to do anything voluntarily that impacts their profit margins (which are on average small anyway) regardless of how settled the science. In general, being “greener” through lower fuel consumption actually saves them money; this is an obvious exception.
An indirect “stick” approach like levying fines or additional charges on airlines causing contrails whilst passing through particular airspace sounds neat, but whilst theoretically contrails observed from the ground or orbit can be matched to ADS-B readings of aircraft that recently passed through that space, systematically validating that in a legally-valid way in congested airspace seems tricky...
I can’t see it being practical to achieve via consumer pressure and wider public awareness campaigns run the risk of getting mixed up with “chemtrails” conspiracy theories
If you want a possible exception to airline lack of sympathy, a UK startup airline Zeroavia is owned by eco-activist billionaire Dale Vince. Their hydrogen powered fleet claims they already intend to capture water emissions to release at lower altitude [1] for the stated purpose of avoiding contrails. Zeroavia are a very atypical airline, currently have zero flights and I’m not sure how much aviation industry executives actually respect Dale, but if you wanted to outreach to an airline that actually might be sympathetic and see PR benefits of shouting about contrails, they’d be a starting point
So I think there’s definitely something to be worked on here, but its going to take industry experts more than grassroots campaigning. I think there are probably some really interesting algorithm development projects there for people with the right skillsets too…
(For anyone interested in space, an analogous situation is the aluminium oxide deposited in the mesosphere by deorbiting spacecraft. This used to be negligible. It isn’t now that constellations of 10s of 1000s of satellites with short design lives in LEO are a thing. The climate impact is uncertain and not necessarily large but probably negative; the impact on ozone depletion could be much more concerning. Changing mindsets on that one will be harder)
Thanks for the very interesting post.
I don’t work in commercial aviation any more, but can offer a few pointers
Eurocontrol are exactly the people you want taking this seriously—they regulate European airspace. So whilst I think it probably is neglected relative to other climate proposals in terms of funding vs estimated impact, it may not be neglected by the right people.
For related reasons, I think it’s way more tractable than most interventions: changing altitude under certain conditions is a lot easier than dissuading people from flying or consuming. And there is an established track record of regulators enforcing environmental rules and costs like noise restrictions and NOx emissions charges (along with sticks governments haven’t beat them with yet like carbon taxing jet fuel)
On the other hand it seems like it’s actually true the current state of scientific consensus hasn’t resolved the important question of when and where to divert yet (see the variability factors in your infographic) and the diversion usually does result in increased fuel burn (and some contrails are even cooling!) And flight directions are a complex multidimesional problem
Airspace controllers will need to be involved because airlines are unlikely to do anything voluntarily that impacts their profit margins (which are on average small anyway) regardless of how settled the science. In general, being “greener” through lower fuel consumption actually saves them money; this is an obvious exception.
An indirect “stick” approach like levying fines or additional charges on airlines causing contrails whilst passing through particular airspace sounds neat, but whilst theoretically contrails observed from the ground or orbit can be matched to ADS-B readings of aircraft that recently passed through that space, systematically validating that in a legally-valid way in congested airspace seems tricky...
I can’t see it being practical to achieve via consumer pressure and wider public awareness campaigns run the risk of getting mixed up with “chemtrails” conspiracy theories
If you want a possible exception to airline lack of sympathy, a UK startup airline Zeroavia is owned by eco-activist billionaire Dale Vince. Their hydrogen powered fleet claims they already intend to capture water emissions to release at lower altitude [1] for the stated purpose of avoiding contrails. Zeroavia are a very atypical airline, currently have zero flights and I’m not sure how much aviation industry executives actually respect Dale, but if you wanted to outreach to an airline that actually might be sympathetic and see PR benefits of shouting about contrails, they’d be a starting point
So I think there’s definitely something to be worked on here, but its going to take industry experts more than grassroots campaigning. I think there are probably some really interesting algorithm development projects there for people with the right skillsets too…
(For anyone interested in space, an analogous situation is the aluminium oxide deposited in the mesosphere by deorbiting spacecraft. This used to be negligible. It isn’t now that constellations of 10s of 1000s of satellites with short design lives in LEO are a thing. The climate impact is uncertain and not necessarily large but probably negative; the impact on ozone depletion could be much more concerning. Changing mindsets on that one will be harder)
which sounds seriously expensive to me....