River rehabilitation and creation of green corridor
The Porsuk Stream divides the city of Eskişehir into two with a green corridor running along the shores of the stream. The Porsuk Stream served provisioning services and acted as a recreational area in the first half of the 20th century, however with increased industrial activities discharging untreated wastewater into the river, rapid urbanisation in the city and other settlements, and increased fertilisers and pesticides in the groundwater originated from agricultural practices (upstream of the Porsuk River), it became highly polluted and its ecosystem degraded severely (1,2,4,5). The Organization for Security and Cooperation in Europe (OSCE) identified the stream as one of the highly dangerous rivers in terms of pollution and health, where no living beings except viruses live (1).
Within the framework of the 'Eskişehir Urban Development Project' the 'Natural Disaster Loss Reduction Project (Porsuk Project)' has been initiated focusing on the ecological restoration of the stream, improving water quality, increasing the resilience of the city against natural disasters (as earthquakes and floods) while also reestablishing the stream's environmental and social role in the city (1). A network of natural infrastructure was created along the Porsuk by expanding public green spaces and link the entire corridor with a sustainable public transport network. (4,5)
Within the framework of the 'Eskişehir Urban Development Project' the 'Natural Disaster Loss Reduction Project (Porsuk Project)' has been initiated focusing on the ecological restoration of the stream, improving water quality, increasing the resilience of the city against natural disasters (as earthquakes and floods) while also reestablishing the stream's environmental and social role in the city (1). A network of natural infrastructure was created along the Porsuk by expanding public green spaces and link the entire corridor with a sustainable public transport network. (4,5)
Tirana Orbital Forest
The Orbital Forest of Tirana is an innovative urban forest that as a green belt forms a natural growth boundary for the City. Tirana has experienced rapid development in the past decades that led to population growth challenging municipal services and infrastructure, while climate change also posed extensive pressures to the urban area with intense flooding, precipitation, urban heat and degrading environment (1, 4). The Orbital Forest is a ring on the periphery of the City that connects 14,000 ha of Tirana’s parks, agricultural fields, and forests, maintaining the ecosystem and supporting biodiversity. (3, 4) The NBS aims to increase urban greenery through the plantation of 2 million trees that fit well to the existing ecosystem while also creating a natural boundary to halt urban sprawl (1,4,5). The afforestation of the Orbital Forest has been done through the “Donate a Tree For Tirana” campaign started in 2017 where citizens, businesses and international organisations can plant a tree adding to the green belt. As of 2021, more than 440,700 trees in the framework of the "Donate a Tree" campaign are also bringing urban nature closer to residents (3).
Ecological Wetland Park in Tianjin
The Ecological Wetland Park is a 630,000 m2 artificial wetland located in a high tech industrial pioneer zone, adjacent to the Tianjin Harbor. The project was initiated by an agency of the local government and constructed with financial support from the Asian Development Bank (1). The area of the park used to be "a natural coastal salt marsh, which become reclaimed land in the early 2000s. The resulting saline-alkaline area had minimal ecosystem value and use value (as it was not considered to be suitable for agricultural activities either)" (1 p20). The wetland park's objective is threefold: 1) to provide a natural wastewater treatment plant for the industrial area to decrease pollutant discharge into the Bohai Bay and improve water quality; 2) to rehabilitating and restoring the once thriving biodiversity in the Harbor Area and the Hai river's estuary 3) to create a place for recreation and leisure for residents. (1)
Integrated Protective Coastal Zone
A combination of green and grey coastal infrastructure is being developed off the coast of Semarang, Indonesia in response to the increased risk of coastal flooding as a result of sea-level rise (Ref. 1). Due to its geography as a coastal city, "Semarang deals with various physical challenges...such as tidal flooding, erosion, land subsidence and rising sea levels" (Ref. 1). Tidal flooding is becoming increasingly worse as a result of climate-induced sea-level rise and increasingly extreme weather events (Ref. 1 and 3). Coastal protection which was historically afforded by naturally occurring mangrove systems has been reduced as a result of the mangroves being largely lost to urbanisation, fish farming and other forms of agriculture (Ref. 2). One proposed sub-project of the Integrated Protective Coastal Zone, Coastal Balance Project 01: Coastal Balance Pilot in Genuk/Sayung, will focus on the northeast of Semarang. Using the 'Building with Nature' approach, it will leverage nature-based solutions through the deployment of green infrastructure, primarily focusing on mangrove restoration (Ref. 3). Mangrove restoration is hoped to stabilise the coastline, therein reducing erosion, encouraging sedimentation and increasing resilience against sea-level rise (Ref. 3).
Green Urban Infrastructure in the municipality of Beira
The Green Urban Infrastructure in the municipality of Beira project aims to increase Beira’s resilience to climate change and flooding (Ref. 2). It is a two-part project that consists of rehabilitating the Chiveve River and constructing a public park along the river (Ref. 1). The river rehabilitation was completed at the end of 2016 and restored the natural flow of the river, enabling better flood control (Ref. 5,6). The public park was completed at the end of 2020 and serves as a recreation, catchment and overflow area through three basins of the river (Ref. 1,2).
Water Fund Mexico
Mexico City's (CDMX) Water Fund was established in 2015 by The Nature Conservancy Mexico on behalf of the Latin American Water Funds Partnership aiming to reduce the imbalance of the aquifers providing significant water supply for the territory of the CDMX and promoting positive long-term water balance (1). "The Water Fund emphasises good science in relation to the selection of sites and interventions, and in comprehensive monitoring. It seeks to make the business case demonstrating that these activities show returns with respect to water security" (1 p22). The first pilot project of the CDMX Water Fund engages small-scale producers in sustainable agriculture practices, works to restore and conserve water-absorbing land and reconvert land to water-friendly agriculture practices (1)
Utopia town Wuppertal urban gardening project
On the brownfield of an abandoned train station and its surrounding terrain, active citizens and neighbors developed Utopia town, a living lab for creative urban development, cultural and creative industries, and citizen engagement. Under the guiding principle “edible train station – edible town", next to other projects, an urban garden with organic cultivation was developed on 1,000 sqm of the terrain at the former train station Mirke as a focus area for their activities due to its favourable location in order to show that gardening is possible in urban spaces, even on balconies or terraces (Ref. 1, 2, and 3). The main building of the Utopiatown has a bar, a concert venue, a food sharing station, and a free bicycle lending service that is operated by volunteers. (Ref. 9). Gardening workshops that are offered to citizens with little experience of gardening are planned to be further extended with seminars and practice classes for students (Ref. 3). Since its beginning, the area of the “utopia town” has grown rapidly and is now providing opportunities for multidisciplinary academic research. (Ref. 12)
Tree plating in Hamburg: "My tree - My city"
Hamburg decided to increase the number of trees in the city, however, the budget was not enough to completely fulfil this goal. Therefore, the city not only tripled the municipal budget dedicated to tree planting and but began encouraging the citizens to contribute to greening the city through the donation campaign "My tree - My city”. The project was launched in 2011 as part of the European Green Capital programme of Hamburg. Citizens can donate and by using an interactive map, can choose a site and a tree species to be planted, and follow-up the implementation of their tree. (Reference 1, 3) The City of Hamburg gave for each tree that reached donations of 500 Euro the same amount on top to cover the average costs of 1.000 Euro per tree, which includes the preparation of the planting pit, the planting itself and maintenance. (Reference 4) The campaign was so successful that it continued even after Hamburg’s year as the European Green Capital and is still going on in 2020. (Reference 2, 7)
Green Wall for Advertising
From 2009 to 2018, a green wall including 1,700 mediterranean perennials (agapanthus, valerian, fern) fed by a water-saving watering system was in place in a heavily frequented part of Marseille (Ref. 3, slide 4). JC Decaux Advertising offered the 70 m² of space for advertising display around the green wall. The project was abandoned in 2018 when the vegetation was completely removed to allow for advertisements to take up the entire surface of the wall (Ref. 1).
Urban Laboratory
This Urban lab has been installed on the roof of the LIMASA Environmental Center, it is testing what types of plants are best suited for green urban interventions through educational and professional programs offered to women. (ref 1) Two training courses are provided connected to these green roofs through the funding of a La Caixa grant, one training course for women as a potential career opportunity through subsidies from the Ministry of Health, Social Services, and Equality (ref 1).

