Not only is industrial agriculture not sustainable but I submit that agriculture of any kind is not sustainable. Agriculture itself has been around for less than ten thousand years. Look what it has done in that time.
Before that time Humans lived sustainably for two million years by hunting and gathering. It may be that hunting and gathering will turn out to be our "default setting" after the peak. We shall soon see.
Buz
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"I've been dazed and confused for so long its not true."
Led Zeppelin

