Thank you to Romilly for pointing me at this programme. According to I-player you'll be able to watch The Natural World episode on farming without oil until 17th March. It's not highly detailed but it is highly thought provoking, a bit scary and also inspiring. It also made me feel woefully ignorant of our biodiversity and how nature works. I dropped biology at 13 and to be honest haven't really been interested in it until recently when on acquiring green wellies, I find I might actually need to know this stuff to understand compost, plants, insects and so on. Anyway I encourage you to watch this if you're in the UK.