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Hanken School of Economics has placed green walls on its campus in Helsinki. The walls are placed in libraries and group rooms where students spend long periods of time to provide better air quality (ref, 2). The NaturVention (now known as Naava) patented active green walls are claimed to filter air 100 times more effectively than regular indoor plants (ref. 3). With pure and fresh Naava air, it is claimed that people can focus on their day, while Naava takes care of their air (ref. 5).

The NBS constitutes the annual planting of new trees, bushes, perennials, vines and flowers across Bialystok. The initiative is designed and implemented by City Hall and aims at improving the image of the urban area, and to provide a pleasant environment for the residents and tourists [1].

Ametzola is a neighborhood of Bilbao District 7 located on the left bank of the Bilbao estuary. In 2005 the construction of a park began since the neighborhood was seen as being alienated from other quarters of Bilbao and solicited a regeneration and integration into the urban life of the city. (Ref 1)

In 2015, the municipality of Białystok restored the riverbed of the Biala river to its natural state. The project addresses the rapidly changing climate and atmospheric conditions which cause more frequent storms by improving the water management in the city. The city reconstructed the old riverbanks, built two ponds for retention, which serve as reservoirs and tanks to stop and distribute the excess water [1,2].

Tallinn implemented a community-based action plan for urban development in the Paljassaare conservation area, aimed at raising cattle on the Paljassaare peninsula, creating community-based beauty and vegetable gardens and restoring a wetland and lakeshores (ref. 3). The Paljassaare area several protected areas required active intervention in the form of care. The management of urban animals had the following objectives implemented: Paljassaare Wetland Complex Restoration; maintenance of a mosaic semi-natural habitat based on conservation values; updating protection regimes and organization; modern visitor arrangement based on protection values ​​and visitor intensiveness (ref. 2).

Owing to European Funds, the University of Białystok opened a new modern ecological campus for the faculties of biology, mathematics and computer science. The new campus was designed to incorporate green and blue infrastructure elements, and embody the pro-ecological profile of the investment. Green vegetation covers the university's walls and roofs, which is nearly half of the 30,000 square meters big campus. There is a brook around buildings and small ponds in the university's inner courtyards. The campus uses a sustainable rain drainage system, which is located on the roof, and the rainwater flows to the artificial water tanks and is continuously filtered and redistributed. Finally, there is a publicly accessible centre for ecological education. Large decorative installations on each of the four courtyards enhance the aesthetic experience in the campus and inspire the faculty and students [1,2].

The project revitalized two old ponds – previous industrial and derelict area – and created two new ponds on the Marczukowska street in the city of Bialystok. The investment in its current shape is a tourist attraction and a valuable ecosystem for birds and amphibians. The project resulted in the increase of biodiversity in the area (additional ponds for the breeding of amphibians, two nesting islands not accessible to the public), and more effective management of the local water resources (cleaning and deepening of ponds, restoring an outflow for the excess water directly to the Biała river). Finally, it is a popular place with publicly open educational trails and bicycle paths [2,3,4].

The multifunctional Southern City Park in Nurnberg was organized in the place of the large car park alongside the railway. Construction of the new green area between Celtisplatz and Tafelfeldstrasse was built in three construction sections. In the western part, the green playground with cableway, slide and climbing rocks was arranged, the Karl-Bröger-Platz was equipped with benches and a fountain, whereas to the east a large green area with 76 newly planted trees was established (1, 4) Perennial plantings were arranged in eastern section of the park, which members of the Bund Naturschutz maintain on a voluntary basis. The park is also a place where social and cultural events are organized. (4)

The enlargement of the Dona Casilda park started in 2006 when Bilbao Ria 2000, a public limited company created in 1992 with the collaboration of the Public Administrations in order to lead the recovery and transformation of degraded areas of the Metropolitan Area of Bilbao, decided to invest in the renovation of the park. (Ref 2,4) The park was considered the main lung of the city, thus its enlargement (which is the presented NBS) was seen as necessary. (Ref 3) As such, the main road that traversed the park was removed and 30.000 sqm of land has been added. (Ref 2,7) The green area was broadened, by removing the road and enlarging the park. (Ref 2)

As part of the Fifth Dimension research program of the University of Helsinki that examines green roofs from the perspectives of biodiversity and the three dimensions of sustainable development (ecological, social and economical sustainability), 8 green roofs were installed in Helsinki. The aim was to find economically viable solutions that are applicable to Helsinki’s and Finland’s conditions. The project experimented with green roofs in different parts of the country, over half of which are in Helsinki (ref. 1, 2, 3).