There's an IndieGoGo campaign for a new documentary that talks about how ruminants are essential for recreating topsoil in brittle environments, places where for months out of the year, the only moist place is inside a ruminant's stomach(s). It seems one of the focus points of the movie is pointing out that eating meat doesn't necessarily kill the planet and going vegan doesn't necessarily save the planet.
The documentary has input from Allan Savory and
Joel Salatin, two of my personal
permaculture heroes.
https://www.indiegogo.com/projects/sustenance-movie/x/6269712#/
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