this post was submitted on 21 Feb 2025
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Are there really people who believe in "sustainable airplane fuel"?
Yes, I'm one.
Like most things, not one thing will fix a problem. SAF is one piece that measurable makes our situation better. The fact you can possibly fly on a plane today partially with SAF is an amazing achievement and the result of lots of hard work by lots of people trying to make a positive difference.
What is it made of?
That is a very important question. SAF is a name for a bunch of different fuels produced from sustainable sources. I posted a larger reply to the main article that details some of the input feedstocks which answers your question here.
And I posted a different comment here: https://slrpnk.net/post/18679785/13966072
You're not getting the fact that those feedstocks have their own feedstocks.
Using waste is also misleading, the goal needs to be to reduce waste, not make the waste a co-product. Cooking oil waste isn't something that's going to be some reliable feedstock either. In the context of economic "drama", you can expect restaurants to close down much more or to reuse that oil a lot more times. Even too much: https://en.wikipedia.org/wiki/Gutter_oil The biodiesel processors won't be able to rely on that source, there's going to be a growing need for the virgin feedstocks.
Your position is essentially the same one as the meat and dairy industries, who are the competitor for that ~~feedstock~~ feed. That includes 'waste'.