A public square is due to be redesigned. In summer, it becomes dangerously hot. For residents of a nearby care home, the heat poses a health risk. Mature trees provide shade and support established habitats, but their roots damage walkways. New planting is restricted by an underground car park. Accessibility, water management, public use and commercial interests add further demands.
One technically attractive proposal promises immediate relief: large shade roofs fitted with solar panels. A neighbouring shopping centre offers to cover a substantial part of the cost. In return, it asks for advertising space and long-term rights to hold events on the square.
The alternative is slower. It combines the preservation of mature trees with new planting areas, smaller shading structures, permeable ground and changes to traffic management. Its full cooling effect would only emerge over several years.
Both options address real problems. Both create new burdens and dependencies.
The decisive question is therefore not only which option should win: What kind of order can protect people today while preserving the capacity to learn from its own consequences tomorrow? The square needs a form. But not one that declares its own effects untouchable.
The lost horizon of the future
This reflection begins with a summer conversation between Markus Lanz, Richard David Precht and Florence Gaub. Gaub describes a striking contradiction: many people assess their personal lives relatively positively while expecting decline for their country or society. Local optimism and national pessimism coexist.
The problem is not simply a lack of favourable forecasts. It is the loss of a shared horizon of the future. Societies plan energy systems, digitalisation, security and economic development. Yet it often remains unclear what kind of common life these plans are meant to sustain.
Where such an image is missing, the future is experienced mainly as risk. Politics narrows into crisis prevention. It can explain what must be avoided, but rarely what collective effort is for. Gaub thus exposes a philosophical vacuum. The future must not only be calculated. It must remain imaginable and open to shared deliberation.
Positive images alone, however, are not enough. A compelling vision can mobilise people while also disempowering them, erasing differences or locking in new dependencies.
The square therefore leads to a second question: how can a positive future be shaped without fixing it in full?
From a vision of the future to a habitable order
Habitability is not a state of comfort. An order is habitable when shared continuation remains possible within it.
People must be able to act in a structural sense. Choosing between predefined options is not enough. They must be able to challenge goals, assume responsibility and contest decisions. Technology must support capacities without silently taking over the purposes they serve. The solar roofs may reduce immediate heat and generate energy. They become problematic when their financing binds the public use of the square to private interests for decades. Natural processes also require more than decorative remnants. A mature tree stands in established relations with soil, water, temperature, animals and people. A newly planted tree cannot immediately replace these relations.
A habitable order therefore connects urgent health protection, public participation, technical support and ecological timescales without reducing them to the same rhythm.
The questions of Path Ethics can thus be directed not only at damage that has already occurred. They can also distinguish between competing designs: Who can actually act?
Which relationships support several sides instead of reducing one to a means for another?
What must endure, and what must remain capable of change?
Diagnosis becomes a practical philosophy of shaping a shared future.
What must endure
Openness alone is not enough.
A square where everything remains provisional and replaceable would not automatically become more capable of learning. Ecological development would be interrupted, while public rights could be renegotiated with every new funding arrangement. Some things must be secured so that others can remain changeable.
Accessible routes require reliability. Root zones and permeable surfaces need long-term protection. Public stewardship must not depend on changing business models. Decisions and responsibilities must remain traceable.
The choice is therefore not between stability and change. The decisive issue is how they are connected.
The square can remain the same public place while planting, traffic rules and technical systems change. Its function is lost, however, when it remains formally accessible while its actual use is increasingly governed by commercial interests.
A habitable future does not protect every existing form. It protects the conditions of responsible change.
How a city can learn
Many planning processes end with the construction decision. People are consulted, options compared and objections recorded. The result then remains in place for decades. That is not yet institutional learning.
A city learns only when experience can alter its order. A trial must genuinely be allowed to stop or change.
For the square, this could mean installing smaller shade structures first and testing them alongside the preservation of mature trees. Delivery times and traffic routes could be changed temporarily. Heat, water drainage, accessibility, conflicts of use and displacement could then be observed.
Responsibilities must be settled in advance: who may act when harmful effects appear, which resources remain available for corrections, and which contracts could block later changes? Here, hope takes institutional form. It lies in the possibility that experience can have consequences, errors can be corrected and locked pathways can be reopened.
Technology and public order
Technology is neither inherently a solution nor inherently a threat. It changes relationships. Who owns the infrastructure? Who maintains it? Which rights of use are tied to its financing? Can the city alter or remove it without reorganising the entire square?
A technically effective system can weaken municipal autonomy if only one provider can operate it. Inexpensive financing can create a destructive coupling when a private actor gains lasting control over public space and events.
The question is therefore not only whether technology works. It is what kind of order emerges through it. A habitable future is not technologically sparse. It prevents technology and financing from silently becoming the authors of public purposes.
Shared continuation despite conflict
Even the most careful planning does not eliminate conflict.
Protecting the residents of the care home may require rapid action. Ecological development takes time. Businesses need access. Mature trees can create barriers. Public funding is limited. Habitability does not mean resolving these tensions harmoniously.
The square must not be ecologically improved while urgent health risks are postponed. Nor should it be cooled quickly by locking its public character and ecological development into long-term dependencies. Some tensions require a political decision. The structural questions of Path Ethics do not determine that decision. Whether health protection, accessibility, public stewardship or ecological development should take priority requires additional political, legal and empirical reasons.
Path Ethics does not replace the decision. It prevents its structural consequences from remaining invisible.
The present from which a future can emerge
Positive images of the future remain necessary. Without them, politics becomes the management of danger. But they are credible only when the present creates pathways along which people, institutions, technologies and natural processes can continue together.
The square is not a minor example. It contains the same questions that shape energy systems, education, mobility, care and digital infrastructure: What is fixed? What remains correctable? Who can act? Who bears the consequences? Which relationships are strengthened, and which dependencies are created?
A habitable future requires binding forms. Rights, responsibilities and ecological foundations cannot be reopened with every change. At the same time, these forms must remain capable of responding. The square will be built.
That is precisely why it must remain capable of changing later.
A habitable world leaves future generations more than solutions. It leaves protected foundations, traceable decisions and a real capacity to continue working on those solutions.
The short analysis “The Habitable Future” develops the square as a decision test. It compares concrete options and shows how the structural questions of Path Ethics can prepare political decisions without replacing them.
The long version “The Habitable Future” extends the same perspective to housing, work, time, public services, mobility, nature and digital spaces. From these fields, it develops the broader image of a learning form of life.