Biotope City Wienerberg is located in the southern part of Vienna on a 5.4-hectare site that once housed a Coca-Cola factory. It lies at the edge of the Wienerberg recreational area, surrounded by business parks and tower blocks to the west and predominantly detached houses to the east (Ref. 1). The project embodies the concept of an "urban biotope" (Ref. 2), grounded in the principle that nature's mechanisms of self-regeneration are essential for mitigating the challenges of urban living and climate change. By integrating urban and natural spaces, Biotope City fosters both human-nature connections and social interactions through activities like community gardening. The project’s centerpiece is its extensive green infrastructure, including trees and green roofs, which serve to cool the microclimate, purify the air, enhance water retention, and create carbon sinks while providing habitats for local wildlife. These green spaces aim to improve physical health through cooling effects on hot days and support mental well-being with their calming influence (Ref. 1; Ref. 2). Biotope City encompasses: Around 980 flats, including 400 subsidized flats and 200 SMART flats A school, a kindergarten, and 2,000 square meters of children's and youth playgrounds 600 square meters of community gardens and 3,850 square meters of ground-floor gardens 250 trees, 8,900 square meters of meadows, and 13,600 square meters of green roofs 2,200 square meters of façade greening The inner courtyards and roof areas are designed for gardening, while façades are greened, and balconies are equipped with integrated plant troughs. Even the spaces between buildings are climate-effective, featuring unsealed catchment and seepage areas to manage water sustainably (Ref. 1). The project’s implementation took 18 years and involved collaboration among various stakeholders. The concept was initiated by the Biotope City Foundation and funded by eight different investors (Ref. 2).
Overview
Nature-based solution
- Community gardens and allotments
- Community gardens
- Grey infrastructure featuring greens
- Alley or street trees and other street vegetation
- House gardens
- Nature on buildings (external)
- Green roofs
- Green walls or facades
- Balcony greens
- Parks and urban forests
- Pocket parks/neighbourhood green spaces
Key challenges
- Climate action for adaptation, resilience and mitigation (SDG 13)
- Climate change adaptation
- Climate change mitigation
- Environmental quality
- Air quality improvement
- Green space, habitats and biodiversity (SDG 15)
- Green space creation and/or management
- Habitat and biodiversity restoration
- Regeneration, land-use and urban development
- Promote natural styles of landscape design for urban development
- Water management (SDG 6)
- Flood protection
- Stormwater and rainfall management and storage
- Health and well-being (SDG 3)
- Creation of opportunities for recreation
- Improving mental health
- Improving physical health
- Social justice, cohesion and equity (SDG 10)
- Social justice and equity
- Social interaction
Principal problems in Functional Urban Area (FUA)
- Climate-Related Hazards
- Urban flooding (stormwater)
- Heat stress & Extreme temperatures
- Degradation of carbon sinks
- Environmental Degradation
- Biodiversity loss
- Air pollution
- Land use and Socio-economic change
- Unequal availability and access to public green spaces
- Health, Well-being and Social cohesion
- Physical health harm (from pollution, wildfire, extreme temperature)
- Mental health issues (stress, anxiety)
- Inadequate access to recreational opportunities
- Disconnection from nature
- Social fragmentation and isolation
Key priorities
Focus
Project objectives
Implementation activities
Climate-focused activities
Climate change adaptation:
- Increase urban vegetation cover to reduce urban heat island effect
- Implement green walls or roofs to lower indoor temperature and provide insulation
- Implement sustainable urban drainage schemes to manage stormwater
Climate change mitigation:
- Increase the availability of green urban space for carbon storage (street tree cover)
Biodiversity conservation or restoration-focused activities
Biodiversity restoration:
- Rehabilitate and restore damaged or destroyed ecosystems
Main beneficiaries
- Citizens or community groups
- Young people and children
- Other
Governance
Management set-up
- Led by non-government actors
Type of initiating organisation
- Local government/municipality
- Private sector/corporate actor/company
- Private foundation/trust
Participatory approaches/ community involvement
- Co-planning (e.g. stakeholder workshops, focus groups, participatory mapping)
- Taskforce groups
- Dissemination of information and education
Details on the roles of the organisations involved in the project
Project implemented in response to ...
Type of enablers
Financing
Total cost
Source(s) of funding
- Corporate investment
- Insurance firms
Type of funding
- Direct funding (grants, subsidies, or self-financed projects by private entities)
Non-financial contribution
Impacts and Monitoring
Environmental impacts
- Climate change
- Lowered local temperature
- Achieved lowered local temperature
- Enhanced carbon sequestration
- Achieved enhanced carbon sequestration
- Water management and blue areas
- Improved stormwater management
- Achieved improved stormwater management
- Green space and habitat
- Increased green space area
- Achieved increased green space area
Economic impacts
- Unknown
Socio-cultural impacts
- Social justice and cohesion
- Improved access to urban green space
- Achieved improved access to urban green space
- Increased involvement of locals in the management of green spaces
- Achieved increased involvement of locals in the management of green spaces
- Health and wellbeing
- Improved mental health
- Achieved improved mental health

Information about this nature-based solution was collected as part of the