I really appreciate the organic producers, and the farmers market type of operations.
But, yes, I have great difficulty with that 'sustainable' type of label.
Really looking at the issue, if you haul any sort of food or feed off an acre of land, you need to haul the same or a bit more nutrients back onto that acre.
It does not matter if it is manure, sea kelp, fish guts, rock phosphate, nitrogen made from natural gas, commercial fertilizer pellets, waste water sludge, idle the land a year to grow a legume you do not harvest, .......
In some way, somehow, you need to replace what was hauled away.
So both organic and conventional farming in the exact same boat - one is not different from the other in that respect.
So these sorts of claims make no sense to me.
Farming in general, either type, Is either sustainable or not. Can't have them both ways!