We also built the root cellar that we can drive a lawn tractor and trailer into to unload produce.

With the movement from gathering and hunting to agriculture, changes in the time and space as well as the spiritual and social orientation and organization of human societies occurred (Torrance, 1994). If the !Kung of the Kalahari desert are any example life originally for us was quite different. They spend about 15 hours a week getting what they need for sustenance. The rest of the time is spent in play. Their children are nursed on demand as the composition of mother’s milk would seem to indicate. Release of pleasure producing hormones in both mother and child during nursing promote bonding. This natural nursing deters conception until the child is weaned at 4 years of age.
"It is now well established that human milk supplies the infant with its full complement of nutritional requirements. . . . Fat content, an important component of breast milk, is indirectly related to mammalian feeding schedules (frequency of nursing bouts) and directly related to mammalian sucking frequency (frequency of sucking within a nursing bout). For example, lagomorphs (rabbits and hares) have very high fat content in their milk and feed every 12-24 hours. In contrast, most primates that carry their infants have low fat content in their milk and feed on demand. Humans, following this primate pattern, have low fat content in their milk. . . . These data support the constant contact model by arguing that the human infant is a rather continuous feeder requiring rather continuous caretaking. (Tronick, E.; Winn, S.; and Morelli, G. 1985. p, 299)
Children are cared for by a wide age range of people freeing the parents from the stress of constant care and providing multiple role models for the developing child. Children learn toilet training in a natural way and have no chores until into their teen years. People live intimately with their organic environment as a part of the web. Individuals, families, clans are all embedded in the greater natural family of their particular piece of the earth.
All energy comes from the immediate environment with the only stored energy coming from trees and water pools. It takes about 4 square miles to support one person. For the prairie indians of the United States it took some 10 square miles and for the Eskimo approximately 54 square miles.
This is likely very much how our ancestors lived until some 10,000 years ago when population pressures, climatic shifts and resource stresses brought on a tremendous revolution in energy use. Using the energy stored in the soil that took years to build, agriculture allowed the continued growth of human populations. When the soil’s energy became depleted new land was brought into service.
The agricultural revolution occurring in a short span of time worldwide allowed the compression of time and space. Square miles for living were reduced to a few acres across a growing season. This is what technology does; it compresses time and space.

Coming to Minnesota in 1973 as a back-to-the-land hippie, I had a lot to learn. Born and raised in Florida, we thought we would die when it got below 45 degrees F. My plan was to heat and cook with wood which I did as a sole source for over 30 years.
The small town (pop. 325) that I lived in while I built my house had a storefront where all the old men would gather. I spent time with the fellows asking them how they did all sorts of things, quite an education. One sample of sustainability concerned the heating with wood. The rule is – one cord of wood (4’x4’x8’) can be gotten from one to two acres of forest. So if you need 10 cords of wood a year for heating and perhaps cooking then you need 10 to 20 acres of forest.
Conceptually, you could start cutting at the front of these acres and by the time you cut to the other end, the process would be ready to start again. Now this is not how it would be done. It would be done with a knowledge of culling the trees and taking any dead fall throughout the ten acres. It would honor the processes of tree ecology. The type of forest would also determine the acreage needed as would the year to year growing seasons.
I asked them about keeping food cold and they told me about ice houses. They cut blocks of ice from the lakes and stored them in buildings putting saw dust around the blocks for insulation. They said the ice would last until the middle of summer.
It is clear to me sustainability is a living process and a process of living.
The one cord to one or two acres example illustrates some of the criteria for sustainability. I have added a few additional. The future may depend on what we mean by sustainable. There are important questions to be asked:
1. When we use something from the earth can it regenerate itself as a tree can or is it non-renewable?
2. When we use something from the earth how long does it take the earth to regenerate itself as in rotational farming or the example of acres of trees?
3. When we use something from the earth how long does it take the earth to assimilate the waste such as computer chemicals and copper processing?
4. When we call something “renewable” does that include all the fossil fuels used to create the devices to capture the sun or wind?
5. How large a geographical area does the sustainable definition include?
6. Is there a holding or carrying capacity to a geographic area and are we willing to discuss it?
7. How should we value non-renewable resources as petroleum from which tractor and ambulance power comes as well as many medicines?
8. All life depends on energy. We need an accounting method to determine the value of how we use energy? Instead of payback in money should we assess a payback in energy for any energy devices such as wind and solar collectors?
We are at a crossroads for the future. This requires hard questions and selfless honesty. We need to be clear about what we mean about sustainability. Faulty definitions create false hopes and dead end decisions.
Also found second post on this page:
http://www.energybulletin.net/node/47776