Increased conservation or restoration of ecosystems

On a yearly basis, the city of Zagreb, Zagrebački holding plants new trees and bushes to maintain Zagreb as a green city with 114 hectares of green spaces (Ref 2). Also includes maintenance of green surfaces, such as grass in public parks along with tram tracks and planting new trees and maintaining existing ones next to kindergartens and schools (Ref 2). Maintenance of city parks, lawns and tree lines includes cleaning, mowing and collecting grass and garbage from green areas, restoration of trampled lawns, maintenance and pruning of trees, shrubs and hedges, maintenance and care of seasonal and permanent flower beds, maintenance of paved and dune areas in parks and installation and maintenance of urban equipment in parks and children's playgrounds (Ref 1).

2017 Green and Grand City is part of Göteborg's 400th anniversary (in 2021), and plans are developed up to the anniversary on a yearly basis. In 2017, the focus was on a greener and grander Göteborg. The vision for 2021 includes three themes, water, building bridges (reduces divides between people) and open spaces. The anniversary efforts build on three elements of sustainability; social, ecological and economic. (Ref. 1)

The conservation of agricultural activities allows for the preservation of the landscape for all, with the possibility to offer to Milaners a place of leisure, tranquility, nature and tradition within the city, where to taste - also while tasting the products of the earth - what is the the Milanese agricultural world. It is located in the South West of Milan, within the Parco Agricolo Sud, in an area between the two Navigli, the Grande and the Pavese (1).

The Sotos de la Albolafia Natural Reserve is situated on a section along the Guadalquivir River, that runs from the Roman Bridge to the San Rafael Bridge (Ref. 3,14). It was declared Natural Monument in 2001 and is part of the Network of Protected Natural Areas of Andalusia (RENPA) due to its wide variety of birds (Ref. 5,15). "The declaration recognized the environmental value of the Sotos de la Albolafia, a singular natural enclave located in the urban center of a large city, in a monumental and historical environment also unique and with an unparalleled concentration in protected species, especially water birds and wetlands." (Ref. 3)

The El Patriarca Park aims to rehabilitate and restore 60 hectares of land for ecological benefits and recreational purposes for the inhabitants of Cordoba (Ref.1,3,4,6). It takes place on a site with distinct areas, including a holm-oak forest with Mediterranean scrubland of extraordinary environmental value. This NBS is an effort to protect natural values, erase the traces of urbanization attempts of the seventies, and repair damages caused by human action (Ref. 6). Implementation of the project is expected to start in early 2021 (Ref. 6).

This NBS is part of the new Porta Nuova area, an extended urban transformation of a neglected area of Milan. It consists of two residential towers of 110 and 76 m height hosting 800 trees and over 20,000 plants from a wide range of shrubs and floral plants distributed according to the sun exposure of the facade. On flat land, each Vertical Forest equals, in amount of trees, an area of 20,000 square meters of forest. In terms of urban densification it is the equivalent of an area of a single family dwelling of nearly 75,000 sq.m (3).

The project is part of the Environmental Billion project (of the City of Stockholm). The aim is to increase biodiversity, mainly linked to the landscape and also to increase the accessibility for visitors to the Kräppladalen (which is also known as Rågsved’s recreation/outdoors area) and make it more of an attractive area to visit. Also, the project aims to develop a programme and work documents that show how the purpose is to be achieved and also to perform restoration and accessibility measures in accordance with these documents. (Ref 1, 2)
Rågsved's nature reserve is the city's latest reserve and was inaugurated in 2018. It contains a mosaic of open meadows, wetlands, moist deciduous forests, deciduous environments and coniferous forests. (Ref. 7)

“The park, inaugurated in May 2003, [was] part of a 1990s project aimed at recovering the ancient canal, combining social needs and providing a space for citizens to spend their free time.” (Ref. 7) It is located on the south bank of the Guadalquivir river (Ref. 7), and today serves as a space for “leisure, sports, and intergenerational coexistence” (Ref. 1)

Østensjøvannet is a nature reserve covering an area of 539 acres, which includes both the water body and certain parts of surrounding land. It was established in order to preserve the important wetland area and its associated vegetation, bird and animal life significant for the region. In June 2002, Oslo municipality went further and created the Østensjøvannet Environmental Park, which covers 1187 acres of land and water. The park aims to further protect and strengthen the area, which is one of the most popular recreation areas of Oslo, and acts as an important area for research and education. (Ref. 1, 7)

“The Guadalquivir River offers some of the best landscape, ecological and environmental values. There is an exceptional variety of flora and fauna and the river is considered as one of the main lungs of the city and as a privileged area for the residents”. (Ref. 12) The river is an essential element of Cordoba, having been declared a natural monument in 2001. (Ref 3, p.4) There are ongoing efforts to maintain and restore the river as a natural and cultural heritage site (Ref. 1,2,5,8,9) and a space for recreational activities (Ref. 12).