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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)

City of Trees is an innovative movement set to re-invigorate Greater Manchester’s landscape by transforming underused woodland and planting a tree for every person who lives there (ref 1). Manchester City of Trees had undertaken work to improve water quality of a tributary of Worsley Brook through channel naturalisation and create wet woodland in the Cleavleys Nursery. The discharge from the tributary caused water quality failures in Worsley Brook under the Water Framework Directive (WFD) (Ref 3). This project allowed the stream to take a more natural course through the woodland and the waterlogged woods provide habitats to species and remedy these water quality issues (Ref 3).

As part of the restoration of park Denis Gardens, an innovative water element was built consisting of water flowing down the stairs, circulated and cleaned by a pump and filters. This helps regulate the local microclimate by reducing temperatures in hot days and creating humidity in the air (Ref. 1; Ref. 5). Also, the element allows people to walk bare-footed and cool off. In addition, the water reduces air pollution by extracting dust from the air, and the structure has an aesthetic and recreational function, with a restaurant underneath. (Ref. 1; Ref. 2; Ref. 6).

In 2016 the Municipality of Lisbon started the renovation of the Botanical Garden of Lisbon, declared in 2010 as a national heritage monument. The botanical garden is both a vital urban open space and a significant cultural landscape of the city. This Botanical Garden is home to an important collection of plants with economic value, reflecting the strong links to the Portuguese expansion and the routes of the navigators that spread them across the various continents. The intervention is expected to provide improvements in the irrigation and water circulation systems, in the rainwater harvesting system, in the reorganization and improvement of garden green spaces, and in the restoration of paths. With the objective of requalifying the space, bringing significant improvements in terms of sustainability of resources, visitors safety, new cultural and recreational opportunity spaces (Ref. 3, 4, 8).

With an area of ​1.7 hectares, "Jardim da Cerca da Graça" (Graça garden) is the largest public green area in the historical area (Ref. 4). It's a green space located inside the fence (cerca) of the old convent of Graça, building previously occupied by the Republican National Guard. The garden was created from the requalification of part of the fence and its opening to the public, also has a function of passage, with new green spaces: a central lawn, a picnic area and an orchard. There is also a kiosk with a terrace and a children's playground (Ref. 2).

Liko-Noe is a business office building that meets all of its energy demands on its own and has a sophisticated system of water reuse and management. The building features a green roof, a green facade, and water storage ponds on the outside (Ref. 1). The building has a constructed treatment wetland for the wastewater treatment, uses solar energy for photovoltaic panels as well as thermal wall (Ref. 4). The aim of the project is to demonstrate that nature-based building techniques can significantly help address the challenges of soil and water degradation, and climate change (Ref. 1).

The woodland community garden is the main project of the Woodland community. Since 2010 they have transformed a derelict urban waste dumping site into a thriving community garden and ‘outdoor community centre’. Since then it has become an important local space where people make new friends and feel part of the community. It’s also a great place to unwind from the everyday stresses and strains of city life. Each year, around 50 households grow their own fruit, vegetables and herbs in the garden’s raised beds. The garden has over 50 raised beds where local people can grow their own food with beds allocated on an annual basis. For people who do not have raised beds there are still plenty of opportunities to get involved, including via twice-weekly volunteer sessions. The garden is a wonderfully therapeutic space that helps people to recover from the stresses and strains of everyday life. (Ref 1)

The Petuelpark is an approximately a 7,4-hectare large park in the north of Munich, situated on a section of the Petuelring between Belgradstrasse and Leopoldstrasse and partly over the Petueltunnel. The park was created as part of the complex transportation development project that aimed to reduce above-ground traffic with the help of the tunnel and improving the quality of life in the area with the help of green development. The park was also aimed at creating a space for recreation: several playgrounds, a water playground, a fountain, a café and several artworks can be found there. (Reference 1) The park also includes the “Generation garden” which is designed to serve as a meeting place, and a place for gardening, as garden beds have been laid out in the garden for free use by the residents. (Reference 3) The elevated parts that situate above the tunnel are implemented as extensive grassy areas, while the other parts are dominated by thematic gardens and the Nymphenburg-Biedersteiner canal (Reference 3).

The Seven Lochs Wetland Park is an urban park that is due to be created in Scotland. It will comprise nearly 20 km² of land and water between Glasgow and Coatbridge. The park will combine many existing features, including four local nature reserves; Bishop Loch, Cardowan Moss, Commonhead Moss (a raised bog) and Hogganfield Park; Drumpellier Country Park which includes Woodend Loch SSSI and Lochend Loch; Frankfield Loch; Johnston Loch; Garnqueen Loch; Provan Hall a 15th-century category A listed building. It will be Scotland's largest urban heritage and nature park. The vision for the Seven Lochs Wetland Park is of a new park of national significance, sustaining and enhancing a high quality, innovative wetland environment that will (a) protect and enhance biodiversity and heritage (b) promote health and well-being (c) contribute to environmental, economic and social regeneration (Ref 1).

In 2012, Glasgow City Council provided Urban Roots with two acres of vacant land for the development of a market garden and orchard. Urban Roots is a community-led organisation working across the Southside of Glasgow. It evolved out of the Toryglen Gardening Club. The Toryglen community market garden sought to encourage community cohesion and environmental improvement in the area of Toryglen. The project is committed to improving the environment and health of the area through a range of activities including community gardening, conservation, and biodiversity. The aim is to inspire people and communities to connect with nature and to take practical action to tackle the root causes of climate change (Ref 1, 3).