Collection of monitoring data continuously throughout the project to aid evaluation

The project involved the redevelopment of old military infrastructure at the periphery of the Zagreb city (Boronaj) into a green and carbon-negative university campus. The Boronaj campus has planned to be the green campus of the university and includes the use of renewable energy (biomass, geothermal and solar), treatment cell for wastewater and a huge green area (with trees and shrubs). The buildings (constructed and to be constructed) are planned to be carbon negative (Ref 1). A significant portion of the campus is the green areas (with trees and shrubs). This was created with the aim to contribute and maintain the native species diversity (Ref 3, 4). In addition to increasing the biodiversity of the city, the tree species has improved the air quality of the area and reduced the local air temperature. The project is partially completed. Some buildings are yet to be constructed. The Campus was officially opened on October 12th 2007 and for now, it hosts 4 university units: Centre for Croatian Studies, Faculty of Education and Rehabilitation, Faculty of Traffic Engineering and Faculty of Economics and Business (only vocational study programmes in economics and business). Five other faculties are also planning to relocate to the Campus in the next few years. Besides the (re)construction of university buildings, campus will be home to a sports centre, student residence hall and a number of institutes. The project is partially completed, some of the buildings are completed while some are yet to be constructed. (Ref 1, 3, 7).

In 2010, about 300 people participated in the planting program for the “350” project and under the “Verde por el Clima” program (Green for the climate) organized by the Department of Environment, Cordoba city council (Concejalía de Medio Ambiente). (Ref. 3)

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 project aimed to tackle two environmental problems through an integrated policy: climate change (both the mitigation and adaptation effects of urban forestation) and air quality. The project foresaw the dissemination of public-private partnership tools, developed within the framework of corporate social responsibility experiences, and the distribution of specific guidelines. Specifically, the project planned to develop a public-private partnership model for urban forestation through the adoption of the ‘green areas inner-city agreement’ (GAIA). This was expected to include three specific protocols for green urban areas covering management, monitoring and mapping resulting in 3000 trees planted across Bologna (1).

The ReLambro project is based on a metropolitan view where nature becomes an occasion for regeneration of the city: the river is no longer an empty and abandoned space but draws a great ecological and environmental system. The interventions, during the design phase, provide for the restoration of the naturalness of large sprawling areas, the reinforcement of the hedges and rows and channels system, the reorganisation of public and fruiting functions in areas at risk of flooding. The project strengthens ecological function by integrating it with urban functions (2).

The Air Pollution Garden (APG) in the UK has been established at Sheffield Botanical Gardens through a collaboration between the three White Rose universities of Leeds, York and Sheffield. Typically an (APG) size is 6x8m and contains plants that are particularly sensitive to damage by pollutants like nitrogen dioxide (NO2) and ozone (O3) present in the air. The project owners hope to raise public awareness of air pollution effects in a tangible manner and change people’s behaviours (ref1).
In 2017, the city council hosted AirFest to push this initiative further (ref 8), a ‘Phyto-sensor’ toolkit was created by the Citizen Sense research group at the University of London to help identify the best locations for Air Quality Gardens (ref 6) and published the Air Quality Annual Status report (ref 7). In 2020 the project is considered as completed, although there are several different other projects in planning.

Eko Ekipa Prečko is an alternative urban garden in Zagreb which was initiated and promoted by the locals. The initiative was not supported by the government initially. Regardless of the lack of support, citizens jointly cleaned an illegal waste disposal site and the bushes and shrubs there to initiate a communal garden. Besides ecological food production, they also organize educational workshops for children and adults to get familiar with life in nature (Ref 1). People of all ages, the majority between age 30 and 40, from Prečko and neighbouring districts are involved with the garden (Ref 4).

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).

Oslo municipality is underway with the large-scale project of opening up rivers that previously were running in underground pipes. Alna Environmental Park is a part of this project and includes major transformation and environmental upgrade of the river Alna. The Environmental Park runs along the river and has transformed grey structures to accessible parks and recreation areas and now acts as an important resource for Oslo's citizens. Central aims of the project are to improve the self-cleaning ability of Alna, while maintaining biodiversity in the region and to inspire future urban development. (Ref. 1, 3)