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.

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Takeaway: Sustainability is not a marketing term or a policy label. It is a measurable state of a complex system. This unit introduced why the word is so confused and what it actually requires. The next unit, "What is Sustainability (Part 2)," examines how time, scale, and system boundaries shape the definition further.