Sustainability is the word tossed about in terms of building, farming, clothing and more lately.
Sustainability is in general terms the capacity to endure.
Being sustainable means keeping diversity while being productive over time. In my mind it also means that you are within your own circle of well-being.
Besides affecting the environment as part of a sustainable farm there are also other keys like being in balance/managing resources, remaining healthy and satisfying needs.
When living on the earth you engage in an interdependent relationship so enhancing each other is key. If one element gets off balance then it doesn’t work. Using what you have where you are and keeping the wheel turning so that everyone benefits including the soil, consumers, farmers, and animals.
There is a Sustainable Meat article featuring Joel Salatin of interest here.