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G'day TC, Thanks for your answers - and the links too. Interesting (and disturbing) stuff there. But it helped me to understand a little more - so, thank you, Regards,

G'day TC, You might be able to answer a question I have - related to this... With 80% of the atmosphere being Nitrogen (if I've remembered things correctly) WHY do we need to supply Nitrogen fertiliser from fossil fuels? And, no, I'm not "having you on" - I'm genuinely wanting...