Enhanced carbon sequestration

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 HUERTAS LIFE KM0 project aims to recover the natural peri-urban Gardens of Zaragoza through the promotion of a ‘zero kilometre’ (km0) concept of local agricultural production. It expects to demonstrate a successful approach for implementing the European Territorial Strategy (ETS), delivering economic, social, health and environmental benefits. " (ref 4) in peri-urban green areas that have been neglected (Ref. 4).

The area was planned to be the Öresund Region's most climate-smart city district: an energy efficient, resource-saving and green district with a hundred percent renewable energy use.” (ref. 2). The area's development program focused on the ecological aspect of sustainability and took responsibility for that part of the city's sustainability work (ref. 7).

The Port of Alicante is finalizing the installation of a new environmental barrier at Pier 17, where bulk unloading is carried out, based on a water atomization method that allows dust particles to fall to the ground of the port area and not arrive by air to the city. (Ref 11) This initiative comprises activities to reduce pollution in the port, such as a vegetable barrier against the air pollution produced by the dust during the unloading of bulk materials, supplied by an irrigation system that recovers non-drinkable water from a nearby plant. It includes the extension of the Parque del Mar, to recover historical points for tourism and the funding of a research project on air pollution (Ref. 12). “This measure is integrated within the Plan of Urban Integration of the Port of Alicante, improving the landscape impact and the port-city boundary zones from the southern access of the urban environment, along with the “Parque del Mar”, to the west zone with the installation of vegetal screens in the inner zone of the port, contributing to an important particle retention and CO2 reduction.” (Ref. 1). Inside the park, which can be traversed through paths, there is a small ornamental lake with rockery and it has children's games and petanque courts, gymnastics courts and recreational areas. The green corridor has been created with the creation of artificial mounds, for which 65,000 cubic meters of earth have been necessary, which act as a vegetal screen and visually and acoustically isolate the port facilities of the city. (Ref 7)

The Urban Ecology Agency of Oslo (Bymiljøetaten) installed two CityTrees in the city of Oslo to act as green lungs in the city and reduce air pollution. The two CityTrees were placed at the Solli plass by Sommerrogata and on Nordraaks plass, close to Slottsparken. The CityTree is an environmentally-friendly plant wall with benches. (Ref. 2) It is an invention of a German company, Green City Solutions, and acts both as an aesthetically attractive furniture for resting, while simultaneously combating air pollution in city centres. (Ref. 1)

The action proposed by the Municipal Technical Service of Parks and Gardens at the Department of the Environment, aims at the regeneration of the forest with the repopulation of pines of different ages, to imitate a mountain in a natural state with the plantation of the Cartagena Cypress and Tetraclinex articulata, which has a good adaptation to the environment. Several plots (Plots 3, 5, 6, 8 and 12 of the project) have been repopulated with shrubs and trees such as cypress, esparto, rosemary, tomillos, lentiscos, tetraclinex and palmito, in the solana area, deciduous and riparian species, and to other silvicultural treatments, which increases the variety of existing vegetation. (Ref. 1) In addition, the project contemplates the construction of two viewpoints (Ref 1, 3). A new irrigation system is put in place for the re-use of water for sustainable use and water savings. (Ref. 7)

FutureBuilt is a program running between 2010-2020, with expectations to continue from 2021-2030 (Ref. 9). One of its projects consists of the construction of a large greenhouse in between a housing complex in an old industrial building. The greenhouse will be the centre of the building and provide a Mediterranean climate with a lot of green facades, green roofs and indoor vertical greeneries (Ref. 1). The nave of the complex will become a greenhouse and the natural gathering point for the residents. (Ref. 1, 3)

This underground garage in Alicante, Spain, received a green roof makeover according to Alicante's climatological conditions (Ref. 2). Urbanarbolismo, a Spanish firm with a strong focus on vegetation, designed and installed this succulent garden in the courtyard of the garage. The garden is very low-maintenance and doesn't require any irrigation whatsoever. Further, with every passing year, it will grow more and more beautiful as the plants grow larger and take root. The Urbanarbolismo Benisaudet IVVSA parking garage was created by this Spanish design firm with the purpose of "keep[ing] the underground lot cooler, as well as improv[ing] its air quality." (Ref. 1)

The first " ecological zone" in Ljubljana was established in 2007 in the old city centre. This led to the closure of a 100,000 m² area to motor vehicles, and the renovation of the main traffic axis to make it attractive for pedestrians and cyclists. The new transport regime in this area reduced black carbon levels by 58%. Additionally, the city administration has planted 63 ash trees. Biking and sustainable mobility have been promoted, in line with providing new green areas for social and sporting activities in formerly degraded areas. The "renaissance“ is not focused only on the city center and the implementation of the car-free zone, but it is expanded throughout Ljubljana and covers different fields, such as the revival of degraded areas, the establishment of green public spaces, playgrounds for children, eco-renovation of schools and kindergartens, cultural and sports facilities, etc. Finally, the river Ljubljanica has been the focus of an ecological restoration project. This was done with the aim of reducing pollution and returning the city centre to the citizens, by incentivizing pedestrian and bicycle commute. The "ecological zone" project has been completed. After the completion of the project, further initiatives were taken which is directly related to the project itself. Some of them focusing on converting the city to a sustainable one is still going on. (1, 3, 4 and 8).

The project aimed to make the banks of the river Sava a more secure place by setting up illumination poles and thus motivate people to go there also by installing potable water fountains. The project includes environmental friendly illumination of both sides of the river Sava, development of 6 water pipes and toilets and renovation of the pedestrian and bike paths (4 sq km). The project in the second phase will also include additional illumination and water stations up to Jankomirski Bridge (in total 16 km, on both sides of the river Sava) (Ref 1).
The locals use the area for running, dog walking and for relaxation. Previously the place didn't have lights which made it unsafe during the night. The Mayor promised the citizens to return the river as well as an emphasis on the bridges that "conect, rather than separate" (Ref 1, 2, 3, 4).