Many thanks for the post, and the link which eventually led me to this, in which Martin Crawford also appears: https://www.youtube.com/watch?v=qVBYgg013KM https

Many thanks for the post, and the link which eventually led me to this, in which Martin Crawford also appears: https://www.youtube.com/watch?v=qVBYgg013KM https://www.youtube.com/watch?v=qVBYgg013KM which also explains why both old (reliant on intensive manual labour) and modern farming methods (almost entirely reliant on oil) are unsustainable in the long term.