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by hx8 1034 days ago
That's a great question. It's actually hard to get this type of data. I once tried to calculate something adjacent by looking at feedstock production, but actually a lot of feedstock is used for 'biofuel'.

My knowledge comes from exposure to the agricultural industry. You might be able to find some animals grazing on a grassy hill, but that doesn't scale. In addition, most NA climates don't support year long grazing.