The Natural Philosopher wrote:

Erm, so what? Surely the point is you are displacing fossil carbon
emissions wherever you use it?

And adding need for more carbon energy intensive fertilisers to grow it.

Well indeed if you grow it specially. I don't think there is any point
in growing bio-fuels[1] since there is always usually something more
useful you can do with the land. As a way of using the waste oil
however, then fair enough...

[1] With the possible exception of using algee to purify contaminated
water, and making a diesel replacement from the resulting sludge.
--
Cheers,

John.

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