https://www.bbc.com/news/articles/cg64pwxzln4o
"Sustainable fuels are synthetic alternatives to fossil fuels, made from renewable sources.
These can include waste cooking oils, vegetable fats and agricultural waste, as well as captured carbon dioxide.
The advantage of burning fuels like these is that it does not add to the overall load of carbon dioxide in the atmosphere."
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The only stickler seems to be difficulty ramping up production. But once the economic fundamentals are figured out, that should not be a problem.
