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Based on a neighbourhood survey the results pointed to a lack of green recreational spaces, in 2015 the citizens initiated a project to develop a new green square at the Zielona Street 19 in Gdynia. The project was implemented in 2018 and it aimed at improving the aesthetics of the district and provide green leisure space for the community. The initiative involves the management of the existing lawn, planting shrubs and trees, creating flowerbeds, building alleys and installing street lamps, creating variously-shaped wooden benches and litter bins, as well as building a fenced sandpit and a playground [1].

The Pré Muché garden is part of the AJONC, Amis des Jardins Ouverts et néanmoins clôturés. This is the community garden of the St-Maurice Pellevoisin neighbourhood. Located behind the church of St-Maurice des Champs and the new Maison de quartier, Pré Muché has been in existence since 2007 on the initiative of the inhabitants. The garden is arranged according to the principles of the natural garden, a space that combines a place of life, cultivated plots and more wild areas. Its maintenance is ecological. It is a living garden where the pond meets the flowered meadow and the regional shrubs (Ref 2).

The Garden of (Re) Finds, was born in Lille in 1997. It is the first "community garden", directly inspired by the model of the gardens New York, which was created in France (Ref 1). There is an organic vegetable garden, a scented hill, a rainwater harvesting system, a regional hedge of regional species, a compost corner and a convivial shelter in corded wood and vegetal roof (Ref 2).

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)

While Hamburg has already had an impressive green infrastructure, it is now (since 2013) implementing an interconnected green network that will cover the 40 % of its area and support commuting by bicycle, recreation and climate change resilience. The project is planned to be completed by 2034. (Reference 9) The project aims to connect the two green belts, parks, recreational areas, cemeteries and animal habitats to each other with green paths and with the already existing “green axes” leading from the agglomeration to the urban core. The green network could not only absorb more CO2 but also prevent flooding by soaking up an increased amount of rain- and seawater caused by storms. (Reference 1, 2). An extensive network of cycle paths is also being built as part of the project. (Reference 2)

According to City Hall, the project revitalized a neglected green area and cleaned the local ponds to create an outdoor recreational space for the citizens and school children. It aimed to develop a new park infrastructure, plant new and protect the existing greenery, and purify the water to improve the ecosystem and provide healthier habitat for water and land species in a slowly decaying area. The ponds were utilized for recreation for the local community in the past [1,4].

In 2016, the project facilitated the revitalization and development of green areas in Dąbie (by an urban part of the Vistula River) to create the Dąbie Park. The park had been a neglected vacant green space with randomly scattered former playground facilities. The initiative involved greenery management and creation (bushes, trees, flower meadows), building new sports facilities (running/cycling paths, a basketball field), new infrastructural solutions (new water drainage system, a viewpoint) and creating a safe and modern space for children in a playground surrounded by large trees which provide shadow. The modernization and revitalization of the park infrastructure and local greenery have made the green riverbank area accessible to the public [1,4,5].

The scheme was designed to manage surface water runoff from a 1 in 30 year event and to always intercept and treat the, often more polluted, first flush of highway runoff (ref. 1). A total of 21 linear rain gardens (total of 148m2) were constructed within the grass verge, allowing for the constraints of access, below-ground services, street furniture and trees. The rain gardens utilise a combination of clean stone aggregate and proprietary units to create void space beneath a planted topsoil layer. They were designed to capture runoff from 5500 m2 of highway from a total surface area of 7100 m2 (ref. 1).

“Nottinghamshire Wildlife Trust (NWT) in partnership with Nottingham City Council (NCC) proposed enhancements to the Fairham Brook nature reserve to allow areas to be re-wetted, restoring areas to their former state. The Fairham Brook watercourse within the reserve was deepened in the 1970s to improve its drainage function for the adjoining agricultural land but it had the effect of draining the reserve also, which is one of the few areas of fen habitat remaining in Nottinghamshire. Fen is a Nottinghamshire Biodiversity Action Plan priority habitat and all efforts were to be made to protect and restore the areas that are remaining. Lowland Fen was also a UK Biodiversity Action Plan priority habitat (ref. 1).

The Chirita dam is the drinking water reserve of Iasi. The lake is protected by law, with bathing or fishing prohibited. In 2013 it was cleaned and sanitized since it became an area where many people used to dump their house residues. As such a national campaign sponsored by an NGO having social responsibility claims implemented this NBS, which meant cleaning the shores of the lake (1).