Environmental quality

The city garden was a 2000 square meter large communal garden in Nuremberg Eberhardshof district that invites all citizens to take part in gardening and co-operating activities without any costs attached. The project was aimed at promoting sustainability for Nuremberg and the Bavarian region (1). The gardeners try to rely on a variety of different plants, even in their last season, they planted 35 tomatoes, 14 chili, ten potato, and twelve bean varieties alone. In 2013, a bee colony was also established. (7) The project had its last season in 2018, after which it had to be closed because of plans to create a district park in its area. (5) The city garden has established itself as an important leisure facility in Eberhardshof by offering, for example, cooking courses and training courses on tree pruning as well as numerous other topics. (6)

Wetlands provide a varying degree of treatment of discharged water and are ideally suited for the containment and treatment of polluted water runoff, being a holistic example of Sustainable Drainage Systems (SuDS). The Dublin Local Authority installed an Integrated Constructed Wetland to treat polluted water discharged from the urban area, with the aim of cleaning urban runoff and drainage water. It was meant to purify water that discharges into a pond, and later on into the Tolka river. The project has been very successful in treating polluted water effectively, according to studies. (Ref. 1; Ref. 3)

From 1850 to 1956 the area Eskesberg was a limestone mine, after that up until 1972 it served as a landfill. When taken over by the city of Wuppertal, groundwater contamination and outgassing required a large remediation to remove toxic substances and recover the area according to nature conservation guidelines. (Ref. 8) Since 2005, it has been turned into a nature conservation area covering 8.5 ha where several rare plants and animals have resettled and thus the area also serves as an important recreational space for residents (Ref. 1, 2, and 3). The project was initiated by the local government, who also collaborate with different partners for maintaining the nature conservation area, such as the biological station, which organizes excursions, performs monitoring on the terrain and sets up bee hives. Also, residents apart from visiting the area can actively participate in its maintenance as volunteers, guided by the city of Wuppertal and the NGO Biologische Station Mittlere Wupper. Furthermore, the nature conservation association of Wuppertal and scientists from the university of Cologne are involved in the intervention by conducting research on the terrain (Ref. 1, 2, 3 and 6).

On 'De Roma', an old cinema that has been renovated into a theatre, a green roof of 650m2 was created which improves biodiversity and contributes to Antwerp's climate change adaptation (Ref. 1, 4). A bee house was also later installed on the roof (Ref. 2). The green roof is created by volunteers of De Roma and Kopspel, which is an organization that provides learning-working places for student of 'Deeltijds beroepssecundair onderwijs (Part-time Secondary Professional Education) and temporary employment for people that want to turn back to the labour market (Ref. 1).

A new wildflower meadow has been created at a new estate on the outskirts of Belfast. The Mount Eagles Drive Action Group held a wildflower planting event with two local Colin primary schools, namely, Christ the Redeemer and Our Lady Queen of Peace to provide a unique opportunity for children to learn about nature, and, in particular, how wildflowers are an essential part of our landscape, enhancing the biodiversity of our native insect, plant and animal species. (ref1) Pupils from Christ the Redeemer and Our Lady Queen of Peace schools spent a morning planting a wide variety of wildflower plugs and seeds in the Mount Eagles wildflower meadow, under the expert supervision of highly trained horticulturalists. (Ref 3)

The Foz do Douro Urban Park located in the west of Porto city is a green area for public use inserted into a recently developed urban area, which has been progressively been built along the Atlantic seafront since the nineteenth century and the Park is part of an overall project submitted in the competition Nuno Álvares Avenue Plan promoted by the Porto Municipality. With approximately 5ha, Foz do Douro Urban Park clearly contributes to increasing the rates of existing green areas for public use, increasing the availability of open spaces for the local and regional level. (1)

On the territory of the former train station Vohwinkel (including the train tracks) a brownfield site of 15 ha was turned into a commercial urban area which was created as an economic driver for Wuppertal. However, the site was inhabited by the highly endangered sand lizard, which is why a species conservation island was created as the commercial park was being built. As a habitat of the endangered sand lizard species, the conservation area in the South-West of the commercial park remained free from construction development, and an adequate conservation concept was elaborated and implemented. The nature conservation area is maintained by the environmental protection department of the city. (Ref. 1 and 6). The project succeeded in its goal of creating a commercial area on the former Vohwinkel marshalling yard while simultaneously paying attention to the protection of the endangered sand lizard. (Ref. 2) Additionally to the conservation area within and around the commercial zone, lizards have also been relocated beyond the city limits as a biodiversity offsetting measure. (Ref. 8) Furthermore, the dried out Krutscheider stream, forming part of an important biotope system with its gravel surfaces, was dug out again to serve as a green corridor for compensation against the habitat loss. (Ref. 1, 4 and 6)

A project began in June 2017 to plant grass, flowers, trees, and shrubs on 10 hectares of “muddy spots”, or unused lands that were being eroded and increasing of dust particles in the city. The aim of the project was to improve the air quality and stop these muddy areas being used as unregulated parking spots. The project was initiated and is partly implemented by the municipality, while volunteers also took part in the initiative, brought together by the citizen group called When we Become 100 000 – we Will Plant a Forest. The project planned to use compost from the new composting facility in Sofia, which reuses food waste. (Ref. 1; Ref. 2)

The municipality aimed to establish a zone in Murcia that worked as a "green lung" for the city while making it its engine for economic, social and cultural development (Ref 2). For this, the municipality planned and implemented the project of "Integrated Alcantarilla Parks". It includes several parks, with the priority of creating one in the surroundings of the Ethnological Orchards Murcia's Museum (Ref 1). The project is called integrated as it is based on the integral values of sustainability where the environment, the economic development and the socio-cultural needs are compatible (Ref 2). For this, there will be sustainable architecture, recovery of the natural environment, as well as incorporating the historical heritage in the public green areas of a specific zone (Ref 3). There are many parks that are part of this project, the last one was the Ibarra de Murcia Park in 2020 (Ref 7 and 8).

A green roof of the total area of 362 m2 was established in a modernized historic neighbourhood in the centre of Bydgoszcz. The rooftop serves aesthetic and recreational purposes for the residents and visitors. Selected plants retain as much as 40-99% of rainwater and absorb air pollution [1].