Citizen oversight (e.g. boards, advisory)

'Groene Mient' (Green Commons) is a citizen initiative that realized an exceptional social-ecological residential project consisting of three housing buildings of energy neutral homes and a 3,500 m2 communal garden (1,6). Storm water is captured from the roofs of the buildings into bioswales, permeable paving is applied, the shared garden is 'eatable' and houses run on sustainable energy (1). The houses do not have a gas connection and have three different sustainable energy systems: heat pump with heat-cold storage, solar boiler or electric heating (6).

The ‘Mountain Forest Initiative’ was launched in 2009 by the Bavarian Ministry of Food, Agriculture and Forestry to restore the protective function of the vulnerable alpine forest in light of climate change, and was ongoing until 2014. To create a general sense of ownership in the process, the Mountain Forest Initiative sought the involvement of different stakeholders at the local level (e.g., private forest owners, land-use related authorities, hunters, nature conservationists, and tourism associations) (Ref. 1).

The Sea Heroes Garden is a community garden that was initiated by citizens on an empty lot with the goal to create a garden in which children can play, fruit and vegetables are grown organically and social activities are organized.(1) In the garden, multiple measures allow for storm water retention and the vegetation provides habitat for a broad variety of species. (5).

The Naturfreibad Haunstetten is an artificially designed bathing lake in the south of Augsburg with a water surface of 9,200 m² and a maximum depth of four meters. After the regeneration of 1,5 hectares of green space surrounding the lake, the baths were reopened in 2010 (Ref. 1).

"Located near several schools, the renovation of this 1,900 m² area, shrubby massifs, grassed areas and varied plants, comes directly from the initiative of local residents" (Ref.1). "During the renovation, the municipal departments ensured the enhancement of biodiversity and ecological management by favoring species that require little watering and phytosanitary treatment" (Ref. 2, page 12).

The entire neighbourhood area was calling for interventions, considering the conditions of decay of this part of the city. The initiative was requested by the residents of the area, in particular considering the state of plants and trees. What needs to be provided is a new surface of grass to replace the terrain on the ground to avoid problems of flooding and new plantations. The park has an important function in terms of mitigation of anthropogenic pressures, but also in terms of social value for the residents. (Ref.1.)

The project was started by a group of local people with the aim of turning a barren piece of land into allotments. The aim was to benefit residents/members of the public by growing their own (local) food (and learning e.g. how to grow fruit, vegetables, and flowers for wildlife as well as bee-keeping). 29 allotments were created. (Ref. 1, 2, 3)

"Formerly a 10 hectare market gardening site, the Repainville area is rich in environmental potential: ponds, streams, springs ... the aquatic environment is present everywhere. There is a great variety of fauna and flora. As an ecosystem that is particularly rare in urban areas, protection and recovery measures are being undertaken" (Ref. 1). The restoration of the wetland of Repainville is part of a flagship project of the municipality in terms of safeguarding biodiversity in urban areas. With arrangements allowing the public to walk there without harming the biological and natural diversity of the place, the site has an educational dimension in order in particular to make young audiences aware of the preservation of the ecosystem (Ref. 7).

The project is an initiative that is part of the environmental management system of the University of Murcia. This initiative aims to implement activities related to sustainable agricultural systems while also serving as a space for social cohesion for the members of the community (Ref 3). For this reason, a community garden was constructed and the slots are until 2019 distributed between members of the community of the university based on a bid (Ref 1).

It is a community garden initiated by the autonomous assembly of the Poblenou neighborhood. It has changed location a number of times, eventually occupying the empty lot of demolished buildings. Over time the garden has expanded, taking over an adjacent empty space, as well as other yards in the neighborhood. The garden is not maintained for strictly productivity purposes, especially because much of its soil has been contaminated by a soap factory. It is, rather, used as a space for social encounter and knowledge sharing on planting and working with the earth on a communitarian basis (Ref 1 and description provided by CEU). This NBS is also part of a wider movement, the 15M movement in Spain (Ref 1), which had influence on the creation of larger similar global economic 'occupy' movements (Ref 5). Video for the opening party of the 8th self-managed squatted garden in the Poblenou neighborhood, Barcelona from April 11, 2020 shows that the idea of the first garden has lead to the creation of at least 8 of these gardens in the city (Ref 6).