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PopinnPark claimed to be the first indoor park of Europe and was created in an abandoned store, aiming at improving the quality of the neighbourhood and bringing nature closer to people. It became a meeting spot for communities, artists, businesses and citizens for exchanging knowledge on social/sustainability issues or for recreation. Popinn Park contained plants that improved air quality, local businesses that provide fair foods and drinks and nature-based art. (1)
After running for two years, Popinn Park closed and was transformed into an art gallery under the name of Popinn Art. Since 2018, Popinnart is an artist-run nomadic collective with over 25 contemporary artists. The art on offer is varied and qualitatively and conceptually challenging. There is a choice of spatial work, figurative and abstract, collages, photography, paintings, drawings, textiles and video. (5)

In 2008, the wilderness experience garden and laboratory was founded on 2,500 sqm of nature area in Münster by Annika and Olaf Bader, two pedagogues. With grasslands, hedges, fruit trees, a treehouse, beehives, a yurt, a fireplace and many more elements it’s a place for nature experience and exploration for children and adults. Guests are encouraged to engage with nature scientifically, via play, arts or manually. Based on a hands-on approach, there are also vocational trainings for extracurricular education providers offered (ref. 1 and 3).

In 2008, a green wall of more than 500 m^2 using a hydroponic watering system was developed on the side of the Max Juvenal bridge. Designed by Patrick Blanc, french botanist and pioneer in the development of green walls, it is considered an "authentic work of art, which evolves over time and the seasons and contributes to "renaturing" the urban space" (Ref. 4, page 7). The wall is intended to illustrate the benefits that green walls can bring to the environment, such as the reduction of heat islands in urban areas and their contribution to cleaner air due to the production of oxygen and the reduction of CO2 rate by photosynthesis (Ref. 1).

The historical canal that was disconnected by a road in the 1970s is currently being restored by the municipality, creating a lively atmosphere allowing for water recreation, a boulevard and green spaces (ref. 1). A small element of this restoration is the addition of green elements by a citizen group, which entails improving ecological, aesthetic and historical quality of the canal by implementing eco-friendly riverbanks, green connecting zones and floating vegetation islands (ref. 3,9,11,12).

Appletree is an outdoor community resource, where people of all ages and from all walks of life, get together to grow e.g. fruit, and contribute to developing and maintaining the area. The growing space and garden are divided into different areas, offering a range of gardening experience. The community also contributes to their permaculture, wildlife and wildflower areas. The community is constantly planting and regenerating areas of the garden. (Ref. 1)

The Polder Roof is a green roof originally installed on the top of the Old School Amsterdam, Gaasterlandstraat, Amsterdam with innovative controllable water storage and drainage system on which crops are grown, solar panels are installed and that provides space for recreation. (1,2) Thereby, it combines multiple benefits including the reduction of heat stress, noise reduction, sustainable energy provision, biodiversity, food production and climate change adaptation (2,7). The Polder Roof was a pilot project that won an innovation award and is viewed as an example for urban climate change adaptation solutions. (2).

In 2019, due to the renovation of the former Old School building, it was necessary to relocate the Polder roof to a different place. The Polder Roof is a completely de-mountable system, made up of crates with a sedum layer on top, thus it could be removed quite easily from the Old School roof and put somewhere else. In the name of circularity, the sustainable drainage system was moved to the roof of the South Food Bank building. (10,11,12) With the relocation of the Polder Roof system, however, the size of the green roof has decreased to 1200 sqm from 2010 sqm (2).

Due to the challenges caused by climate change, Hamburg decided to become greener and developed a comprehensive, pioneering green roof strategy. The strategy aims at creating 100 hectares of new green walls by 2019 by providing grants for building owners for greening roofs and offering them rain water fee reduction owing to the rain water retention of the green roofs. (Reference 1) The financial support offered until the end of 2019 is 3 million EUR. (Reference 2) The services offered by the city in this plan consist of four pillars: promotion (financial incentive), dialogue, regulation, and scientific support. (Reference 7)

With the relocation of the railways between the Hauptbahnhof and Pasing a large area became available for an infill development strategy. The redevelopment of central railway areas of Munich is in line with the city's guidelines for sustainable development (Perspective München) referred to as compact - urban - green. The initiative is aimed at implementing 7500 new flats and creating 15000 new workplaces in total, which are supported by green recreational areas. (Reference 1) The project consists of six separately planned parts, some are already partially finished. (Reference 2) This NBS discusses Birketweg, one of these parts, which is 60 hectares large.

The South Saint-Jacques district is a residential area. A public housing project in the district incorporates careful landscape planning to promote social interaction, increase biodiversity, and better manage rainwater. It includes green spaces, collective area for free initiative from the community, swales and planted basins for rainwater drainage (Ref. 1).

In 2010 a new drainage system was installed in Traktoros Street that solved the disposal of surface-water so that bigger storms would not cause damages in the area and separates rainwater from the sewage. The rainwater is directed to the lake in Adyváros. The project was the third phase of the complex reconstruction of draining in the Szabadhegy neighbourhood. While the first two phases (the construction of the main pipelines and drainage of Pannónia Street; drainage of Vak Bottyán Street and paving streets) were financed by the municipality, the third phase was implemented with the help of the EU. (Reference 1, 2)