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FYI, there is no such thing as "sustainably sourced forest and crop residues" today. Unless someone wants to suggest a way to replace the vital nutrients and humus such activities would deprive the land of, the suggestion is DOA. We've seen over and over again through the course of human civilization where people over-estimated how much they could take from the land, only to see the land fail them as it dried up and turned to rocky sand and soil. The only thing keeping our modern farms alive today is gobs of synthetic fertilizers, which are decidedly unsustainable.
I'm getting a little sick of people suggesting we short-circuit ANOTHER natural cycle to fix the natural cycles we've already fucked up.