Key points
- Urban nature is shaped by infrastructure and social relations, not just natural processes.
- Material flows in cities reveal power dynamics and social inequalities.
- Cities are hybrid spaces where technology, ecology, and society are interconnected.
We open a tap and water appears. We put out a bag and waste disappears from our street. A park looks like nature, while a pipe looks like technology. Matthew Gandy questions precisely these separations. What happens if city and nature belong to the same material and political process? His urban political ecology connects water, waste, infrastructure, technology and social relations. Nature does not begin where asphalt ends. It circulates through networks crossing buildings, streets and bodies. For Gandy, urban environmental problems are also problems of power and inequality. Understanding a city therefore requires following its flows. We must ask where they come from, who controls them, who gains access and which territories receive their consequences.
Understanding urban metabolism
The mechanism can be understood through urban metabolism. The term describes the city through material flows that sustain urban life. Water, waste and other ecological processes enter, circulate, change and leave through concrete infrastructure. Yet this metabolism does not function like a natural organism separated from society. Social relationships belong to its operation. A technical network determines where a resource can circulate. It can also connect some places more intensely than others. This can be read as the social production of urban nature. Infrastructure transforms ecological processes and incorporates them into metropolitan life. The city changes nature while continuously depending on it. This relationship makes it impossible to maintain a simple boundary between what is urban and what is natural.
Consider a first case. Two neighborhoods belong to the same city and need water every day. The resource may appear natural, but access depends on a constructed network. Pipes, connections and infrastructure turn water into an organized urban flow. The example is hypothetical and adds no outside facts. Its purpose is to make Gandy’s mechanism visible. If one area receives different connections, the environmental question immediately gains a social dimension. Asking how much water exists is not enough. We must also ask how it circulates through the city and through which relationships. Our interpretation is that a pipe can become a geography of access. Metropolitan nature then appears organized through material decisions affecting different territories in different ways.
The politics of material displacement
A second case begins when waste leaves a home. From that moment, it seems to disappear from everyday experience. Yet it remains part of urban metabolism. It must circulate through systems, infrastructure and territories. Gandy allows us to ask which social relationships accompany that movement. Which spaces receive flows removed from other spaces? Which infrastructure makes that transfer possible? We do not need invented answers to understand the question. The supplied argument shows waste, technology and ecology forming one urban configuration. This can be read as a politics of material displacement. Something that visually disappears from one neighborhood does not disappear from the city. It changes location. Following that journey reveals environmental connections that everyday urban landscapes often hide from view.
The third case introduces cyborg urbanism. Here cyborg means an inseparable combination of bodies, nature and technological systems. Imagine someone whose everyday life depends on networks of water, energy, transport and technical devices. Their urban experience is never purely natural or purely technological. It happens through combinations of both. Gandy uses this idea to challenge overly clean separations between society, technology and ecology. Our interpretation is that the city functions as a hybrid construction. Bodies depend on infrastructure, while infrastructure reorganizes natural processes. The result is not a machine independent from nature. Nor is it untouched nature hidden beneath buildings. It is a material relationship where technical and ecological systems jointly produce metropolitan life.
There is a strong counterargument. Distinguishing nature, technology and society can be useful when studying concrete problems. A pipe remains constructed infrastructure, while an ecosystem retains its own processes. Mixing every category could make analysis too broad. This objection deserves a fair presentation. Gandy’s approach does not require every difference to disappear. His proposal shows that these dimensions become articulated in concrete urban situations. We can distinguish them analytically while still examining their connections. The problem appears when separation prevents us from seeing how a technical decision transforms an ecological relationship. It also matters when separation hides how access to particular flows depends on social relations. Connecting these categories does not erase their differences. It allows us to stu
Frequently asked questions
How does urban infrastructure shape nature?
Urban infrastructure transforms ecological processes and incorporates them into metropolitan life, revealing power dynamics and social inequalities.
What is urban metabolism?
Urban metabolism describes the city through material flows that sustain urban life, showing how social relationships influence ecological processes.











