I believe that sustainability as a practice can come in many forms.  There can be large scale forms or smaller forms, such as conserving water or throwing your aluminum cans in the recycling bin.  Large scale forms of sustainability can come in methods of harvesting natural resources for our comunities.  For instance clear cutting an old-growth forest, cutting down large areas of trees, is not nearly as sustainable as a selective method, where a company would harvest one tree in half an acre over a very large space.  Not only would this practice provide lumber for a town, but it would retain many of the natural aspects of a "forest," instead of a tree farm.  These aspects could be fungal communites in roots to clean and promote the growth of more trees, and overall just retaining a healthy food web which is always good for soil and healthier trees.   

　Some of the best sustainable practices can also be older methods.  Sometimes in mining, older methods like tunneling, though they aren't as efficient, are much safer and less hazardous to both the environment and a local community than other methods like mountain top removal.  Tunnel mining would not only prevent most hazardous mining run-off from rain, which usually carries down heavy metals and strong acids into water systems, but it would keep the aesthetics of the land and it would be practicing good environmental ethics, not thinking of the land as a commodity, but as an ecosystem on which all depend.