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CityTree is a four-meter high freestanding installation that is able to purify city air of harmful pollutants by using a special moss culture. (Reference 1) The local government of the 3rd district tested the technology under a 6 month trial from September 2017 to March 2018. The CityTree pilot project in Budapest was concluded, once the district administration decided not to continue the project further due to technical reasons. The irrigation system started to malfunction very early in the trial period, which caused the mosses to dry out and thus producing no quantifiable results. (Reference 9)

The Svoradova small park is an NBS site of the Bratislava zelenaj project. The newly renovated park (once part of the historical Pálffy Garden) on Svoradova Street in Old Town was previously abandoned and neglected. (14) It is part of the citywide Bratislava zelenaj project aimed at protecting and promoting the welfare of the city’s vulnerable citizens from the effects of climate change, (1) providing a safe recreational space for children (with a small playground for playing and swings). The park also has new lighting, and the whole space is home to new flowers, bridges and trees. (10, 12, 18)

Agora Budapest is a large scale urban redevelopment project initiated by private investors. Besides implementing five high-quality office buildings, the investors aim at creating green public spaces the size of 7000 square metres in order to provide a healthy and vivid working environment. The green surface involves green roofs, parks and tree lines, all which will be irrigated using collected rainwater. The solar panels on the roofs of the buildings are also part of the sustainability plans of the investors. (Ref 1. and Ref 4.)

This NBS site is part of the Bratislava Zelenaj Project. This particular NBS involves the creation of vegetation on buildings as a means to mitigate the effects of climate change in cities due to urban overheating caused by global warming. It targets the residents of the Archa House of Seniors (Domove seniorov Archa) in Bratislava as part of the citywide project “Bratislava is preparing for climate change” with the aim of protecting and promoting the welfare of the city’s vulnerable citizens from climate change effects. The roof's main function is buffering the discharge of excess rainwater. (10)

The initiative is comprised of a project to recover the coastal line of Alicante, from El Campello to Elx (approx. 21 km long). The Municipality called an ideas' competition with the aim of developing a sustainable coastal corridor project that includes an intervention on the entire Alicante coastline and generates a continuous itinerary integrated into the landscape with new places of opportunity for the residents of the city (Ref. 7). The two-stage competition sought proposals for a new ‘coastal passage’ featuring the creation of new multi-purpose public spaces promoting biodiversity and accessibility (Ref 13). The winner was announced on the beginning of 2019 and the Municipality planned to start the development of the first 2 parts of the project. The winning project of the competition bears the slogan "My connected archipelago" and is the work of the Grupo Aranea and Subarquitectura studios from Alicante (Ref 14), a project that considers ecological and sustainable principles (Ref. 9).

The greening of the Bega channel is a project which dates from 2008 and which aims at cleaning and revitalizing the channel on a distance of 44 km, in order to improve water quality, increase economic activities related with the river, and avoid future floods of the area. Since the channel has not been revitalized from 1945, the 2008 project is seen as an important step in improving not only the life quality of the Timisoara's inhabitants but also a major step in including environmental issues on the official agenda of the municipality. (1)

The Botanical Park is originally a garden which went through a modernization and rearrangement process in 2008. The park covers an area of 8.41 hectares and has a varied flora which is of Romania and also of various areas of the world which have a similar climate to the country. The purpose of the rearrangement was to maintain the area for scientific endeavours and to educate the public with respect to the importance of the environment. The municipality added this area to the 13th existing parks of Timisoara, which are part of the green belt of the city. (1)

Opened in 1987, Lo Morant Park is located in the northern part of the city of Alicante. Its flat surface of 12 hectares is ideal for walking among its vegetated spaces and for the development of multiple activities focused on the neighborhood (Ref. 1). An educational environmental tour of the park is in place for learning and discovering the fauna and flora. The park offers different social activities and facilities (sports facilities, leisure). (Ref. 1). It is the largest park in Alicante with a dimension of twelve hectares, and has a great diversity of plant species and sports and cultural spaces. (Ref. 3)

The action proposed by the Municipal Technical Service of Parks and Gardens at the Department of the Environment, aims at the regeneration of the forest with the repopulation of pines of different ages, to imitate a mountain in a natural state with the plantation of the Cartagena Cypress and Tetraclinex articulata, which has a good adaptation to the environment. Several plots (Plots 3, 5, 6, 8 and 12 of the project) have been repopulated with shrubs and trees such as cypress, esparto, rosemary, tomillos, lentiscos, tetraclinex and palmito, in the solana area, deciduous and riparian species, and to other silvicultural treatments, which increases the variety of existing vegetation. (Ref. 1) In addition, the project contemplates the construction of two viewpoints (Ref 1, 3). A new irrigation system is put in place for the re-use of water for sustainable use and water savings. (Ref. 7)

"After decades of abandonment and deterioration, Zaragoza took advantage of the opportunity of the Expo 2008, to form a new relationship with the Ebro River, transforming empty, inaccessible, degraded and unsafe banks into places of encounter and representation. Public works on the Ebro were designed as structures with various functions." (Ref.3)