Regenerative city

Going beyond urban sustainability

At the core of the regenerative city concept lies the understanding that it is essential to go beyond a restrictive definition of sustainability and embrace a broader model of urban development that puts the emphasis on the need for cities not to only to sustain but to actively regenerate the natural resources they need and absorb. While the original definition of sustainable development states that “sustainable development is a development that meets the needs of the present without compromising the ability of future generations to meet their own needs” regenerative urban development recognizes that considering the speed and scale of current resource consumption, the ability of future generations to meet their own needs is many times already compromised. For example, in 2013, by August consumption worldwide had already overshot the earth’s annual natural production. For the rest of the year humanity was incurring resource debt. Therefore, in light of the problems related to resource consumption and overshoot, regenerative cities strive not only to stop consuming natural resources at a rate which is faster than ecosystems can recover, but reverse the trend by actively improving the regenerative capacity of ecosystems they rely on.

Linear resource flows in an urbanising world

Currently most cities are heavily dependent on resources which are consumed and wasted with little consideration to their origin or their final destination. Input resources such as water, food, energy and goods are imported from well beyond the cities´ boundaries to be consumed by city dwellers and discarded in the form of waste and pollution to air, water and land. In order to meet the increasingly high level of energy demand, cities import and burn fossil fuels whose output pollutes the air and increases the level of greenhouse gases which cause climate change. Raw materials are continuously extracted to meet an ever increasing consumer demand and very often exit the consumption chain in the form of waste to landfill that cannot be reabsorbed by nature. Nutrients and carbon are removed from farmland as food is harvested, processed and eaten and the resulting waste is discharged into rivers and coastal waters downstream from population centres and usually not returned to farmland. Rivers and oceans become increasingly contaminated by sewage, toxic effluents and mineral run-offs. This deleterious relationship in which cities are unable to interact in a mutually beneficial way with the ecosystems on which they depend is putting at risk the long-term viability of urbanization. Regenerative urban development is based on the understanding that if urban areas are to continue to offer individuals around the world the prospect of an improved quality of life and ability to realise their potential and aspirations, they must embrace their role in ensuring that the earth’s life support systems remain healthy and sound. This can be achieved by adopting a model of urban development which enables cities to interact symbiotically with their surrounding environment and actively improve the degraded conditions of their supporting ecosystems.

The regenerative vision

First of all, the development of a regenerative city requires a switch in paradigm away from the old linear metabolism – which allows cities to operate within an isolated segment of the resource cycle – to a new circular metabolism. Regenerative urban development seeks to mimic the circular metabolic systems found in nature where all waste becomes organic nutrients for new growth. In regenerative cities priority is given to closing the urban resource cycle which means finding value in outputs that are conventionally regarded as waste and using them as resource inputs in local and regional production systems.

For example, a regenerative city reintroduces treated water into the hydrology cycle, sources food from urban and peril-urban producers, captures the nutrients from its sewage and waste to be applied to surrounding agricultural land, reduces its dependence on petroleum products and boosts the deployment of renewable energies particularly from local sources. Closing resource loops in this way is the first fundamental step toward regenerative development.

The second step is to actively work to regenerate the materials and resources the city uses, making the regenerative city a node of production. This can be aided by developing ecosystem service infrastructure within the urban area which improves the self-sufficiency of cities and their ability to meet their own demand for energy, food, water and goods from resource within the city’s boundaries or from the surrounding areas. While many cities, especially megacities and those located in resource-poor regions, may not be able to meet all their needs within their own borders, they can employ a concept of subsidiarity: to seek opportunities to optimise urban and peril-urban production as much as possible before relying on the surrounding region, only after which they would look further afield. This renewed, enhanced relationship between cities and their hinterland and between urban and rural areas is a key aspect of regenerative cities.

The fundamental processes for implementation

Beyond ensuring the long-term environmental sustainability of urbanization, implementing the regenerative city also means creating opportunities for local economic growth, enhanced liveability and well-being, better public spaces, improved social equality and cohesion, greater democratic participation, and stronger urban resilience. The implementation of regenerative cities is enabled by adopting a series of processes and policy solutions that create cites which are dynamic centres of democracy, public engagement, human development, innovation, urban regeneration, well-being, justice and equality. The key processes and recommendations to pave the way towards the regenerative city include:

1. Vision, leadership and long-term target setting
2. Citizen participation and democracy
3. Multi-stakeholder engagement and cross sectoral cooperation
4. Multi-level governance and vertical coordination
5. Enhanced targets and indicators
6. Communication, education and behavioural change
7. Improved research and connection to policy-making