Sustainability isn’t a belief system; it’s physics

Sustainability, like many topics today, tends to get talked about like it’s a belief system. Something you’re either for or against. A team you pick.

Which is a bit unfortunate, really, because that particular category also includes whether pineapple belongs on pizza, the correct way to hang toilet paper, and how to pronounce data.

However, unlike those topics appropriate for lively debate, sustainability isn’t actually up for debate. It’s physics. And until humans (or anyone else, frankly) come up with a better framework for explaining how matter and energy move through closed systems, it remains more or less fact.

And what does sustainability mean in this respect?

For the purpose of this series, sustainability means the ability to keep going because there is a balance of inputs and outputs. This applies as equally to ecosystems as it does to supply chains, energy costs, and business models.

The environment is one system. Your business runs on dozens.

And finally, before we delve into the details, I want to make my intention clear: this article is an attempt to explain sustainability in plain language and connect it to the systems in which we exist, including what happens when those systems get pushed past their limits.

The basics

Earth is a closed system for matter. Energy comes in from the sun. That’s it.

Everything we extract, we rearrange. Everything we produce has outputs. Some of those outputs the system can absorb. Some of it can’t, or not fast enough.

Take CO2 — quite possibly the most debated of the greenhouse gases. The atmosphere has absorbed carbon dioxide for billions of years. It’s part of how the planet regulates temperature. The issue isn’t that CO2 exists; it’s the rate at which it is created. We’re adding it faster than it’s being removed.

Think of a bathtub with the tap running and the drain open. As long as the drain keeps up with the tap, the water level stays stable. But turn the tap up (even a little), and the water rises. The drain still works, but the flow rate has changed, which means the likelihood of a flooded bathroom has increased significantly.

Feedback loops

Systems have feedback loops. Some are stabilizing, meaning they push things back toward balance. Some are amplifying, meaning they push things further from it.

Some examples:

A stabilizing loop: more CO2 in the atmosphere catalyzes plant growth.

More plants absorb more CO2. The system corrects itself, up until a certain point.

And an amplifying loop: ice reflecting sunlight

When ice melts, darker ocean water is exposed. Darker water absorbs more heat. More heat melts more ice. More ice melts, more heat gets absorbed. The system accelerates away from where it started.

And another amplifying loop: warmer oceans absorb less CO2

Less CO2 absorbed means more stays in the atmosphere. More CO2 in the atmosphere, warmer oceans. Round and round.

These loops aren’t predictions, nor are they models someone built on a computer and hoped would be right. They’re measured, observed, and documented. You can see the ice extent data yourself — NASA publishes it freely.

The point here is not to urge you into a hand-holding circle sing-alongs about saving the world. The world will save itself, with or without us. The point is that systems don’t behave the way our intuition expects. We think in straight lines. Systems think in loops.

Thresholds & tipping points

Here’s the part that really trips people up: systems don’t degrade gradually. They hold, hold, and then…they shift.

A bridge doesn’t sag slowly under increasing weight. It holds its load right up until it doesn’t. The failure isn’t gradual. It’s sudden.

Ecosystems work the same way.

A rainforest can handle some clearing. You can take out trees, and the forest compensates. Different species fill gaps, rainfall patterns adjust, and the system adapts. But past a certain threshold, the forest can’t sustain itself anymore. It stops being a rainforest and becomes a savanna.

That transition isn’t a slow fade. It’s a regime shift. And it’s not reversible on human timescales. You can’t plant your way back to a rainforest in a generation. The soil has changed. The water cycle has changed. The species that held it together are gone.

This is why “gradual improvement” can be misleading. The issue is thresholds.

Scale

Now here’s where it gets important for anyone running a business.

None of these major ecological shifts is caused by Jim’s tire shop. Or Svenja’s sewing company. Or your restaurant, your logistics firm, or your manufacturing operation.

The top 100 companies produce 71% of global industrial greenhouse gas emissions.

One hundred companies. Out of millions.

The chemicals in your water, the microplastics in your food, the particulates in your air…they come from industrial-scale production decisions made by a small number of very large companies over decades.

And it’s considered “advancement”.

So what?

The physics is real. The environment matters. That’s not the debate.

The debate is: who’s responsible, who’s paying, and whether the system we’ve built to “fix” it actually works.

Because there is a system. A massive one. Worth tens of billions of euros. It has rating agencies, certification bodies, consulting firms, software platforms, and regulatory frameworks. It produces reports, scores, and questionnaires.

The question is whether any of that actually changes the physics (hint: it can’t).

That’s what the rest of this series is about.

This is Part 1 of a 7-part series on modern sustainability — what’s real, what’s broken, and why it might be time to look at it differently.