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You did, and that is the proper term. My point though, is that any time someone references "not enough protein", it's clear there is some level of misunderstanding nutrition and nurtritional sources. (not necessarily you, as I assume you're giving an example of something they said in the documentary)

Well your english is quite good :-) "not enough protein" is one of the most common, though factually incorrect, arguments against veganism.

Absolutely, the soil (and microbiology in it) is just about the most important thing for the survival of humans, and every other living thing on the planet.

I would argue your last point a bit, it is quite easy (not simple, but with the knowledge, easy) to revitalize the soil.

Even in pure desert, we can create lush food forests: