Some Suggestions for Designing of a Sustainable Earth Co-operatively.
The need for designing a sustainable world co-operatively is explained at "The Need for Designing the Future Collaboratively" - http://www.modelearth.org/intro.html .
A design of a sustainable world should start with very basic components. Once the bare-bone structure of the design is outlined well, then it would be possible to start elaborating on this basic design.
The most basic unit, component of a sustainable world design is the simplest viable community conceivable with its basic habitat.
Viable community is the smallest possible social unit. It is viable in the sense of being able to perpetuate itself indefinitely on its own, without needing, for its biological and cultural survival, any contact with any other members of its species outside itself.
It is important that the basic design is as simple and transparent as possible, as "bare-bones" as possible--to the point that it could not possibly be any simpler!--even if, at first, we might think it too simple. But the design best start from very simple--if there are any difficulties to arise from complexity, it would be much easier to fall back onto a simpler design that is well understood, rather than start with a complex design and then, if difficulties should be experienced, we would not know where to go for safety.
Every simple viable community in the whole world would have to be designed with taking its local conditions on mind, and with enough "buffering" around it to allow for any unforeseen expansions of its basic territory that might be necessary due to, perhaps, climatic changes, or just for extra measure to accommodate any, even unforeseeable, exigencies. The "buffering" zone has to include more than enough space for all other species that we share the Earth with for them to be able to live without being discomforted by us in any way, of course.
However, even though each individual sustainable community would be designed to fit to its own unique local conditions, the basic principles of the design would be the same--when starting introducing more complexity into the design, at the same time the design has to continue to support lifestyles at the full width of the spectrum to accommodate every possible form of sustainable living--from the very simple ones to more complex ones.
Any more complex forms of society (and there might be many) should organically arise from the simplest possible one, with no infringements on the basic capacities, so that if the need would arise, it would be possible to go back for all members of the community to a more basic form of existence without any difficulties. This, of course, would require the "buffer zones" to be large enough to allow for any advanced forms of sustainable living to spread out into the larger territory needed when going back to simpler forms of sustainable living when and if needed. In this way a great variety of sustainable life styles would be possible to exist side by side without them interfering with each other, without incurring any unreasonable demands on any of the neighbors, human and non-human alike!
The design that would be based on the above stated principles would have the best chance to exist even if the environmental damage would cause extreme environmental conditions--it would be better able to withstand many changes that we cannot foresee now.