The Natural Philosopher wrote:

it takes nearly as much diesel to make the fertilizer, harvest the oil
seed and plant it, and process it, and transport it to the garage..as
you get at the end of it..


No it doesn't, in fact osr isn't too bad to get a liquid fuel, it beats
having 1/5 of the arable area under cultivation for fodder for horses.

In terms of just thermal efficiency wood harvesting is pretty good but
there's a lot more utility in a litre of diesel than 6kg of freshly
harvested wood.


And you would need about 50 times the area currently under agriculture
to get near UK demand.

Probably, there's about 18 million ha of farm land and about 25% of this is
arable we might be just about self sufficient for food if we maximise crops
for direct human consumption AND continue to use fossil fuels and fossil
derived fertiliser.

Where's a lamb when you need one?

AJH