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You must be talking about someone else. Once again, assuming no growth in the population and in the economy, sustainability requires at least one energy technology with ERoEI* not less than 1.0 as described in https://www.eroei.net/sustainability.htm . A radically different method for counting the energy requirements of those upon whose work the energy technology in question depends both directly and indirectly is presented in https://www.eroei.net/Mark-III-Economy.html

Richard Freeman wrote:

Sustainability in the most basic terms requires that production be feasible into perpetuity. However, in practice, applying this principle will involve gradations of sustainability, beginning with managers choosing between available options by phasing out the least sustainable option as an ongoing policy. This decision-making requires analysis because of all the associated productive factors. A practical analysis would include the following considerations and more.

Sustainability indexing

Sustainability indexing requires identifying empirically verifiable indicators based on a goal-programming process, assigning weighted value to the indicators, and transforming them into an index that reflects and sums all the indicators. In regard to production, several factors lend themselves to assigning indicators, from extraction and all associated environmental costs, to processing, transportation, distribution and administration.

Precautionary principle

The precautionary principle is fundamental to sustainability. It states that before undertaking any action that will affect public health or the environment, in the absence of scientific knowledge on the effects, the manager should adopt full precautionary measures. It is based on the principle, “First, do no harm.”

Renewable resources

Renewable resources can be renewed on the productive site within a generation or some similar time window relevant to those who must live with the degradation of their environment based on ecological and biological prerogatives.

Sustained yield

Sustained yield is a principle that requires that a periodic yield be matched by growth in that period continuing into perpetuity so that feasible harvest levels never decline from period to period.

Leonardo Lavanderos added an answer

2 days ago

El Desarrollo Sostenible, es insostenible e insustentable, porque lleva adentro el allien del crecimiento económico encubierto.

Richard Freeman We don't need all those indices and other concepts. Given de-growth, we need energy. ERoEI* <https://www.eroei.net/sustainability.htm> entails a rather large number of requirements. The Sun may be considered a permanent source of energy and negentropy; but it will be difficult to replace vital materials once they are lost; therefore, we must conserve, substitute, synthesize etc. vital materials to approach sustainability as close to the astronomical limit as we can. Conceivably, we may someday develop our homo sapiens character sufficiently that we are good enough to visit heavenly bodies other than Earth, but I doubt it.

 Leonardo Lavanderos Clearly capitalism must go; but I see no reason why socialism, syndicalism, communism, or dematerialism should be infested with the alien creature economic growth.

Ahhh my dear Thomas, because all you have named, locate the solution in the society-society relationship and not society-nature. Therefore, they fail to sustain communities. As long as the solutions come from sustainability and not from the relational system, there is no solution, that's why all the definitions that have been presented so far don't matter. The second-order disease, not seeing that you don't see, has no solution for this case. They all speak describing an object external to their distinctions, with a certainty in the properties they describe that seems more like religion than science. There is no solution on this side.

Dear L² Indeed I do not see what I do not see. Moreover, I see that no one else sees the correct answer but me, which looks damn suspicious. However I am encouraged by the fact that no one else seems to agree with me and most everyone continues to add incomplete or incorrect answers to the list of unnecessary conclusions; therefore I may be right after all. You can see why I worry about democracy although I continue to support it. Just imagine what education could do if it were free of propaganda.

But, your elegant prose sounds more like religion than does my simple straight-forward engineering solution. We have just experienced a little of the type of grid collapse that will wipe out civilization although in spite of a much different category of preparation. We will understand in what way our community is unsustainable when the energy stops flowing. Someone show me in what way I have not characterized sustainability correctly. By the way, many of the clauses in my current definition of ERoEI* are due to people finding fault with what I had written previously. That's the kind of criticism I can really use. Don't just say something will go wrong; tell me what it is.

I repeat the three aspects of the sustainable steady state: energy, energy, and energy.

L²

The various descriptions of social relations embedded in socialism, syndicalism, communism, and dematerialism do not set bounds upon society's relation to nature. But, that is what makes them amenable to sustainability. They can accommodate any sort of economy consistent with their tenets. Tell us more and explain the details of your profound observation.