Increase or improve urban vegetation cover to help reduce outdoor temperature

Collaboration between the City of Aarhus and private property developer DOMIS Ejendomme has been recognised by the award of a silver certificate for sustainable urban planning for the Bryggervej project. The aim of the project is to try out various sustainability principles. Green and blue solutions are included in the project, e.g. green roofs, green facades, green open spaces and blue elements/water in the park areas to increase recreational values and add moisture to the dry urban air. (Ref. 1, 2, 3)
By 2020, the first residential project was built called Risskov Brynet (Ref 8). Information in the project since 2017 is about this project. The project is certified according to DGNB Gold because it is based on a high standard for both social, economic, and environmental sustainability. An important part of this project is a 'highly insulated climate screen', a technology of the project that is incorporated into the project to address climate change (Ref 8, 9, 10).

The Agenda working group called "Natural gardens in Wachtberg" aims at the development and promotion of nature-based construction solutions and increased use of local wild plants since 1998. In this pursuit, it managed to acquire land (400 sqm) from the municipality of Berkum and, transform the lawn area into a near-natural garden showcasing nature-based gardening elements with the help of other environmental associations and sponsors (1,2,7). Apart from securing and enhancing local biodiversity, the garden serves as a display of possible elements and solutions of a nature-based garden for interested parties. Moreover, through information boards, workshops and a detailed brochure on implementation guidelines, the project can spark interest and empower local residents to implement such nature-based elements in their own garden (1, 3, 4,7).

"Micro-flowering are participative urban gardening projects that allow the vegetation of streets by small plantations of annuals and perennials, vegetable and ornamental, in the municipal public space. Generally, it is a matter of developing a mineral surface on the municipal surface of the city by planting pockets. These are then maintained by the inhabitants who requested micro-flowering. Micro-flowering is a place of sharing and conviviality that allows the inhabitants to be actors of their neighborhood" (Ref. 1). In 2018, formalized 'greening permits' were launched. In this system, micro-flowering permits are requested by residents and "The municipal agents come to drill the concrete of the sidewalks and the City provides the plants" (Ref. 9 and 11).

Metrodom Panorama is a private investment containing four 17-storey residential buildings. Following the model of Bosco Verticale of Milan, the facades of the buildings will be created as vertical forests. In the balconies of the buildings 3 to 6 meter high trees are planned to be planted. The construction was finished and the buildings were opened for residents in 2020. As the building is still very new, the green elements of the building are not fully grown in their size, but in 3-4 years the buildings of Metrodom Panorama will be covered with especially lush vegetation. (Reference 9)

The present intervention is about the rehabilitation of the freedom square (Námestie hraničiarov) (formerly Gottwald square) in the city district of Petržalka of the city of Bratislava (9, 11). The area of the intervention is about 1 ha. The pavement was replaced by grass areas, trees, and flower beds in the square’s alleys. A water capturing and irrigation system was also installed to ensure resilience to drought. The project was implemented by the city district of Petržalka, which is - with 100,000 inhabitants - one of the larger and most densely populated districts of Bratislava. (1)

The rooftop garden of Nádor 15 was implemented as part of the sustainable campus development strategy of the Central European University. It contains a community garden that is managed by the CEU community, intensive green roofs and green walls as well. The rooftop garden also collects water for it's automatic irrigation system and supports biodiversity with bat shelters, bee hotels and birdhouses. (Reference 1)

The curtain forest at the end of the city is a project that was initiated by the Timisoara's Municipality in 2001 by planting different tree species and creating a barrier for high-temperature summers. It's 60 m high and it was designed to stand in front of very strong winds especially since Timisoara is a city located in a very plain area. Now, it comprises 23 hectares and the municipality aims at 50. (2)

With its parking areas, ponds, the Lutter stream, playground facilities, walking and jogging paths, the green corridor of Bielefeld, called Luttergrünzug offers recreation opportunity to around 36, 000 people, living in the surrounding areas. As a link between the eastern city center and the district of Heepen, it also enables walking and cycling routes for commuting and shopping away from the busy streets of the city (7). However, the green corridor has been showing some structural and functional defects such as the silting up of the ponds, conflicts between pedestrians and cyclists and the increasing overgrowth of the green belt (8). In order to solve these problems, the renovation and redesign of the Green Corridor was proposed. The regeneration project addresses different needs and requirements of the municipality, namely providing the comfortable infrastructure for pedestrians and cyclists, and the increase of attractiveness of the neighbouring residential areas. In the planning process, special attention was paid to the improvement of the draining system and the reservoirs of the area that will protect the Belt from flooding. (8)

Two regeneration plans were developed with citizens' involvement and presented to the political committee. In 2017, the implementation of the "smaller" variant was voted for, which was already presented in the first citizens' workshop (1, 4).

Developer company Helix plant systems built a facade for the restaurant at the Kasselbrink pavilion located at one of the central squares of Bielefeld. According to the preliminary expectations, the green facade will release 760 kg of oxygen per year and absorb 1070 kg of CO2, having a positive effect on the ecosystem, reduce the building's energy use for heating and cooling while also has aesthetic value by breaking the grey tone of the square (Ref. 1, 7, 8).

The Svoradova small park is an NBS site of the Bratislava zelenaj project. The newly renovated park (once part of the historical Pálffy Garden) on Svoradova Street in Old Town was previously abandoned and neglected. (14) It is part of the citywide Bratislava zelenaj project aimed at protecting and promoting the welfare of the city’s vulnerable citizens from the effects of climate change, (1) providing a safe recreational space for children (with a small playground for playing and swings). The park also has new lighting, and the whole space is home to new flowers, bridges and trees. (10, 12, 18)