[wcerfgba]

Does anyone know anything about 'sustainable aviation fuel' (SAF)? The last time I flew, I was given an option to pay for this, but I don't know what it actually is, how it's made, if it's carbon neutral, or if and in what ways it is 'sustainable'.

[yau8edq12i]

There you go: https://en.wikipedia.org/wiki/Aviation_biofuel#Sustainable_a... no point in trying to summarize a complex issue like this in a tiny HN comment.