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Comment by samvher | Hacker News Reader

I don't think this "you don't need to feel guilty if you're not a frequent flyer" narrative is useful at all.

A flight uses between 2 and 6 liters of kerosine per 100 km for every passenger [1]. You travel around 800-900 km per hour on a passenger plane, which means your rate of fuel use is fairly high (let's say 30 liters per hour). Putting it in these numbers allows you to compare it to filling up your car and puts some things in perspective.

Taking a flight now and then is not going to end the world. But it does provide an easy opportunity to reduce emissions.

[1] https://en.wikipedia.org/wiki/Fuel_economy_in_aircraft

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The frequency argument seems reasonable as driving yourself to the same location is generally worse for the environment. What makes flying bad is the rate you can travel. You can fly 2 million miles far easier than driving an IC car that distance.

Of course this assumes commercial aviation, private jets are much worse for the environment.

driving yourself to the same location is generally worse for the environment

Curious what this is based on, taking road construction, car ownership, etc into the calculation? Because as for fuel consumption clearly it depends - if you're a family, taking 1 car is generally going to be more fuel efficient.

I was just assuming a single passenger thus ‘yourself’ and normal distance vs fuel. For a couple it’s likely still true as the break even point for fuel would be around 40+MPG. That’s assuming you’re not increasing congestion and thus lowering others fuel economy and flying does not make this trip much shorter or longer.

A family is as you suggest likely better off driving unless they are renting an RV. But, IMO avoiding a 10-20+ hour road trip with a car full of kids is an excusable reason to be less fuel efficient.

PS: At scale things tip further to flying as roads have a separate set of issues.

Thank you for accurately outlining the scale of the problem. I meet so many who think that only flying once or twice a year is OK, or that flying can't be that bad.

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