Highmindedness can be admirable. But highmindedness from a position of relative privilege that wants to become a 'movement' is a potential source for concern.
Just how many people in the world would need to voluntarily turn to veganism for global sustainability to be achieved? If it were to succeed, how would such a movement avoid both conflicts externally and then coercion internally?
The movie didn't volunteer an answer. It turned seriously preachy towards the end and its determination to talk about food strictly in terms of biological science ultimately smacked of philistinism. Dairy products as baby cow expansion juice...
I could go around telling everyone that we had chosen to remain childless for the good of the planet, and preach this as the sort of thing that all highminded folk from roughly my own demographic should follow. But, in the words of Rudolf Abel, would it help?
Even in China, where there is a cultural bias towards surrendering individual choice for the good of the collective, state coercion was ultimately required and ultimately proved only passably effective. There were also unexpected adverse consequences to ponder.
There always are - back in the 80s the outside interferers bemoaned Guatemala's high infant mortality rate. Problem solved. Now they decry the mortality rate from the crime wave created by a generation of grown-up unwanted children that the economy cannot adequately provide for.
The history of the world's great international movements of highminded ethical change are not encourageing. Monotheistic faith revisions have fallen short of the 50% mark and there are indications that the voluntary nature of such commitments soon segue into systems of coercion and castigation.