What is Sustainability

Where this fits: This is the first chapter of SiD Theory. It tackles the most fundamental question the framework must answer before anything else can proceed: what does "sustainability" actually mean? Everything in SiD builds on the definition established here.

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The Problem with a Vague Definition

Ask ten people what sustainability means. You will get ten different answers. Recycling. Renewable energy. Surviving as a species. Saving biodiversity. Curbing population growth.

The word matters. It drives policy, investment, product design, and political platforms. Understood correctly, sustainability represents the central challenge of our century. Yet there is remarkably little agreement on what it actually is.

Since the start of this century, the realities of environmental degradation, social inequality, fragile economies, and climate instability have pushed "sustainability" to the center of every sector. The word has eroded under the pressure. It appears in marketing strategies, political speeches, and product labels with no consistent meaning behind it. Many developments labeled "sustainable" are not sustainable at all. This is often due to genuine misunderstanding rather than deliberate deception. But the damage is the same: the word loses energy, meaning, and power.

Worse, many well-intended sustainability measures have made things worse. Power-saving regulations that increase environmental toxicity. Recycling programs that burden developing countries. Certifications that invent their own reality.

Virtually no one has the tools to separate real progress from noise. Next time you see a disposable bag calling itself a "sustainable product," recognize that both the word and you are being made a fool of.

If few people know what something is, how can anyone hope to achieve it? Imagine two people building a house together with different ideas of what the house should be. It would be a disaster. A good definition of sustainability is not optional. It is foundational.

The Brundtland Commission Definition

The most widely used definition comes from the 1987 United Nations report Our Common Future, written by the Brundtland Commission:

"Sustainable development is development that meets the needs of the present without compromising the ability of future generations to meet their own needs."

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-- Brundtland Commission of the United Nations (1987)

This definition has been instrumental. It brought time and people into the conversation. It made visible the fact that our children will bear the consequences of our choices. But it has two structural problems that make it hard to use in practice.

First, it describes an outcome, not the thing itself. Meeting the needs of current and future generations is a result of sustainable development, not the process or the condition. That is like explaining the rules of soccer by stating the scores of a match. You cannot use it to evaluate whether what you are doing is sustainable.

Second, future generations have no voice. We cannot consult the future to ask whether we got it right. This makes evaluation against the definition nearly impossible.

Other definitions share similar problems:

"A strong, just and wealthy society consistent with a clean environment, healthy ecosystems, and a beautiful planet." -- Thomas and Graedel (2003)

"A sustainable global society founded on respect for nature, universal human rights, economic justice, and a culture of peace." -- Earth Charter (2009)

These describe what sustainability should look like. They do not pinpoint what it is. SiD fills that gap.

SiD's Definition of Sustainability

Here is SiD's sustainability definition:

Sustainability is a state of a complex, dynamic system. In this state, a system can continue to flourish resiliently, in harmony, without requiring inputs from outside its system boundaries.

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Applied to our civilization, this state is consistent with societies powered by renewable energy and closed-loop material systems, living in thriving ecosystems, on a biodiverse planet, with healthy and happy individuals living in just, tolerant, and diverse cultures, supported by open and transparent economies.

The first two sentences define what sustainability is. They are actionable and testable. The second part illustrates what the definition means when applied to human civilization.

To understand the power of this definition, we need to unpack four concepts: systems, states, complexity, and dynamism.

Sustainability and Systems

The definition describes sustainability as a "state of a system." This may seem abstract. Why use such difficult language?

Consider a thought experiment. You buy a toothbrush. The package says it is sustainable. What does that mean? Is it made from environmentally friendly material? Produced without slave labor? Does it promote a sustainable lifestyle? All of the above?

Think about it further. The toothbrush's impact on society changes depending on context. How much water you use with it. Whether its production process dumped toxins in a river. Where it was manufactured and how it reached you. Whether it will be recycled or incinerated. It even helps prevent dental suffering, but that is not a property of the toothbrush alone.

The "sustainability" of the toothbrush depends on factors outside the toothbrush itself. Some of those factors have not happened yet. The product does not carry within itself the control to define how it is made, used, or discarded.

This leads to a key realization: an object cannot be called sustainable without knowing its full context. And really, we do not care about an eternally existing toothbrush. We care about the relationships between the toothbrush and everything it touches: the environment, people, society, your life.

In SiD, sustainability is not a physical property of material objects. It is expressed at the system level. Saying a toothbrush is "sustainable" is like saying a person is "love." Love describes a relationship, not an inherent property. Sustainability works the same way.

A wooden table is not necessarily more sustainable than a metal one. An electric car is not always better than a petrol car. Context determines impact. At the time of writing, electric vehicles could not serve as ambulances because of long charging times. Choosing one as an ambulance could cost lives, which may outweigh the environmental benefit. But that could change next year.

We can speak of eco-efficient products or environmentally friendly objects. But sustainability operates at the system level: the level where all things interact.

What is a System?

A system is a dynamic set of actors, relations, objects, and interconnections. A city, a company, a community, or society as a whole. All the "hardware" and "software" combined. A system exists in time and space, always moving, changing, interacting.

What counts as a system is defined by people. It is not a scientific truth like gravity. It is a theoretical device we use to think about the world. We create a system by defining its boundaries: where the system ends and the rest of the universe begins.

We do this to manage complexity. Looking at everything in the universe as one connected system may be more truthful, but it is debilitating. So we draw a boundary, usually one step larger than the challenge we are examining. Working on a building? Investigate the city. Developing a service? Investigate the community or region.

By drawing that boundary, we lift a focus area out of the complex network and examine it as a distinct entity, still connected to everything else, but in a more manageable way.

What is a State?

A state is a position a system occupies, regardless of its physical components. It differs from a property, which is inherent in the physical makeup. A state concerns the configuration.

A light switch has an "on" state and an "off" state. Nothing is added or removed between them. The same materials exist in both. Only the relationship between components changes.

Sustainability works the same way. One system can be in a state of sustainability while another, made of identical materials, is not. This is critical. Understanding that sustainability is a state means we can reach it with everything we already have. We do not need extra "stuff." We need to reconfigure the relationships between us, our stuff, and each other.

We could have been in a sustainable state in the past. Perhaps we were. We can reach it again. But we departed it, probably a few hundred years ago, and getting back is not simple.

Systems in Time

Systems have boundaries in space, time, and context. Something is sustainable for a relevant time frame. "Relevant" because it is pointless to worry about sustainability beyond the expiration of our sun, scheduled in about 100 million years.

In practice, a relevant time frame spans several generations. Looking much further than 50 years is rarely feasible. Yet 50 years is a blink in human history. This is where resilience becomes essential. Resilience is a long-term property encompassing patterns of change. Growth is just part of the ebb and flow.

Nothing is eternal. Nothing should be. Sustainability does not mean immortality. Things come and go. A sustainable system pulses like all natural systems, adapting to become better fitted with each cycle. It accepts there is an end, and it resolves gracefully when that moment arrives. Like dead trees becoming habitats for new organisms, leaving room for the cycle of life to continue.

Complex Systems

The word "complex" appears in the definition deliberately. It signals that we are talking about non-linear, infinitely complex entities, almost like biological organisms, not predictable, finite machines.

Non-complex systems can be fully indexed, modeled, and predicted using physics, mathematics, or engineering tools. A house's electrical wiring is non-complex. It can be complicated, but its behavior is predictable from a mechanical perspective. This mode of analysis has dominated the last century.

Complex systems are entirely different. They consist of so many objects and relations that we cannot track all of them. They exhibit behavior that cannot be predicted through normal modeling. The weather is an easy example. No mathematical model can accurately predict weather more than a week ahead. Too many factors interact, and some governing patterns have not yet emerged.

Twelve Properties of Complex Systems

1. Numerous. Uncountable components, all influencing each other. Behavior emerges beyond any single component's mechanics.
2. Understandable but not predictable. Any action may have unpredictable side effects. Prepare for resilience, not prediction.
3. Grow like organisms, perish like organisms. No complex system is meant to exist forever. Aim for longevity, not eternality.
4. Require increasing resources per added unit of complexity. Growth always has limits.
5. Change through revolutionary jumps and slow evolutionary progression, both at once. Details matter as much as large-scale variables.
6. Do not behave the same way given the same conditions. History does not reliably predict the future.
7. Always dynamic, never entirely in balance, even when they seem to be.
8. May exhibit survival or cognitive-seeming behavior. Thinking of a complex system as a biological entity with a character helps understanding.
9. Require incubation periods. Changes take time to register. Be patient. Measure across the full spectrum to catch rebound effects.
10. Best understood by human brains, which are themselves organic complex systems. Immerse yourself. Get out from behind your desk.
11. Interact beyond their chosen boundary. Maximize beneficial externalizations. Minimize dependency on them.
12. Always contain hidden dynamic processes with both beneficial and destructive effects. Find these patterns.

Some complex systems appear non-complex, or have been treated that way. This is dangerous. Economic policies that do not account for complex dynamics are simply not resilient, which means they are bad policy. Expecting complex systems to respond like machines is a road to disaster.

SiD focuses on complex systems because they determine the future of our world. While non-complex modeling can offer useful insight, we must exercise caution when encountering it. The temptation to simplify is strong. It is also hazardous. Complexity is where systems do their special thing, and that is why the word appears in the definition.

Dynamic Systems

SiD defines sustainability as a state of a dynamic system. Sustainability is not a fixed point. It is an edge condition of something that always moves, changes, grows, shrinks, and adapts.

A system can move and change while remaining in the state of sustainability, as long as it does not cross a boundary. This allows us to pursue sustainability without locking into static, rigid structures that would kill resilience.

Because something always changes (climate shifts, natural cycles, entropy), a system needs adaptability to survive. Without dynamism there is no adaptability. Without adaptability there is no resilience. Without resilience, sustainability is impossible.

Resilience, Autonomy, and Harmony (RAH)

The second sentence of SiD's definition identifies what a sustainable state actually consists of. It breaks into three system indicators:

Resilience determines the degree to which a system can survive unexpected events. It is critical for continued existence. A resilient system absorbs shocks and adapts, rather than breaking.

Autonomy (captured in the phrase "without requiring inputs from outside its system boundaries") determines how well a system can meet its own needs and sustain its ability to continue doing so.

Harmony may seem unusual as a technical term, but it is essential. A system can be resilient and autonomous, yet collapse from internal tension. Inharmonious systems (unjust, inequitable, with large divisions of resource control) generate strife and even war. A system that is resilient and autonomous but not harmonious conjures images of hardy evil empires. That is the opposite of what we seek.

Harmony draws intelligence from human rights and ethics: equity, social justice, the perception of value, and how we determine "good" and "bad."

The word "flourish" also appears. It captures the positive values that resist easy quantification: quality of life, cultural expression, artistic value, excitement. Resilient, self-sustained, harmonious life is already good. Flourishing makes it worth celebrating.

How It All Adds Up

With SiD's definition, a sustainable system is self-sufficient, resilient enough to operate under a wide range of expected and unexpected events, and harmonious and just while it flourishes.

Applied to modern society, this means:

• All energy and material loops are closed
• Finite resources are no longer consumed
• Wealth and power are distributed ethically
• Ecosystems and fellow species are thriving
• We benefit from natural resources without breaking them down
• Every person has a chance at a life of quality and meaning
• Resources are equitably distributed

Who does not want that?

Now that we have a basis to align on, the next step is to understand how systems work in practice: their layers, their components, and how to analyze them. That is the subject of the next chapter.

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Reflection Exercise

Practice understanding what sustainability means by thinking about how these items relate to a systemic context. Remember: only systems can be sustainable (or not). How would you reframe the following?

• A "sustainable" soda can
• A "sustainable" city
• A "sustainable" house
• A "sustainable" organization
• A "sustainable" policy measure

Suggested format (20 minutes): Assign one term per person. Take 5 minutes to think individually. Then share results, one by one, followed by group discussion.

What to look for: In each case, it helps to reverse the term. A "sustainable" soda can is a soda can that maximally contributes to a sustainable society. A "sustainable" city is a city that contributes positively to the sustainability of the country or the global society. And so on.

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Takeaway: Sustainability is not a property of objects. It is a state of a complex, dynamic system, characterized by resilience, autonomy, and harmony. To work with it, we need to understand systems. That is where we go next.

Next chapter: 1.2 The Anatomy of a System