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El Paseo de Canalejas is "an alley of trees inside the city tracing a central green corridor which exhibits its old ficus whose shades provide a pleasant refuge to the visitors during the hottest days of the year. Those ficus trees are considered as natural heritage." (Ref. 1). "In order to protect the Monumental Arboreal Heritage, Alicante City Council has worked on the elaboration of a Catalog of Unique and Monumental Trees of Local Interest that reflects the inventory of this heritage and provides these specimens with protective measures" (Ref. 3).

The Festival Park Liverpool project involves the transformation of the former International Garden Festival site into an internationally recognized riverside suburb with strong neighbourhood connections and leisure facilities. The 36-hectare site is split into three different zones namely 1) Development Zone 2)Southern Grasslands and 3) Festival Gardens. The project masterplan was created by K2 Architects and was launched by the Liverpool City Mayor Joe Anderson. (Reference 1, 4, 7).
The Festival Park Liverpool masterplan consists of 1) a mixed-use housing including residential zone, primary school, medical centre and a culture hub 2) social heart of the residential area with hotels, bars and restaurants 3) a beachfront neighbourhood with residential apartments, pavement cafes, restaurants and bars, designed around an ‘Amsterdam’ styled canal frontage 4) festival gardens 5) grasslands to be remodelled into a natural habitat for wildlife and leisure activities (Reference 1).
In 2017, a set of land surveys and environmental assessments, along with the first phase of site mediation, were carried out. A consent to develop 1380 residential units were provided with validity until December 2022 (Reference 1). Detailed site investigations have been undertaken in the Development Zone and now underway on the Gardens and Southern Grasslands (Reference1, 8). A 9.9M pound remediation programmed funded by a grant from Homes England will begin in Spring 2020 in order to prepare the site to deliver 1,500 homes with supporting retail leisure and community uses. Liverpool City Council has started to engage prospective investors, developers and operators in discussions for bringing forward the project. It has opened opportunities for investor involvement which includes equity partners, co-investment or development funding, offering a potential for a long-term relationship with a public sector partner or investor. The project will be built in several phases commencing in Summer 2021 (Reference 9).

"Grünes" C is an initiative of six municipalities (Alfter, Bonn, Bornheim, Niederkassel, Sankt Augustin and Troisdorf) to secure, connect and (re)develop open and recreational spaces (agricultural, cultivated, garden, commercial landscapes, protected nature areas, rivers, transport routes). The major objective is to create an accessible, united park landscape in the original area of the "Grünes C" which spans 37 square kilometres to preserve those landscapes facing urban pressure. This is envisioned through a set of interventions initiated in and around the participating municipalities. Bonn has three interventions that will be dealt with here (3,4,5,9)

The Urban Environment Observatory is located on a plot of 7,000 square meters of surface transformed into a garden with native vegetation. It is comprised by a library, an Assembly Hall, exposition rooms and spaces for educational activities. There was planned to be a cistern that would collect the rainwater that will serve for irrigation of the garden and the garden terraces (Ref. 1 and 7). The project has since been halted for what seems to be politically-relevant financial reasons, according to Ref 8:"everyone has many explanations to give about the current situation of an unfinished building after more than a five-year period".

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).

The neighbours of the Fuensanta in Cordoba recovered an abandoned public plot of the old Fuensanta’s cinema transforming it into a social and ecological vegetable garden (Ref 1), occasionally used to play soccer and used as a dog park previously (Ref. 3). "All the activities were free of charge, coordinated by volunteers and consisted of: a walk around the neighbourhood, a building recycled furniture workshop, an urban vegetable gardens workshop and urbanism for children workshop. All of them took place in the plot and the creation of a vegetable garden was the most popular activity." (Ref 1)

A recovered green area next to the Guadaira river, it opened as a park in 2014 (Ref 6). In its planning it reconciles the historical use of the river to power the historic mill and its new use as a green corridor on the Eastern part of the city. Its large dimension allows it to fulfill the quadruple ecological, landscape, leisure, and non-motorized mobility dimensions. (Ref 4,5,6). The park was officially inaugurated but it continues to face challenges. In 2007 the economic crisis led to construction being stopped and the budget of the park cut from 23.8 million euro. Construction was started and the budget re-established at 17.2 million in 2011. (Ref 5)

Hammarby Sjöstad is the first eco-city district in Stockholm. It is a 'town around a lake' where the planning work begun in the 1980s with an opportunity to expand the inner city of Stockholm. It is one of Stockholm's biggest urban development project and it focuses on water, energy and eco-friendly solutions. As a part of the ambition to create an eco-friendly city district, investments in e.g. green spaces, walkways and several large parks have been made. Furthermore, the Hammarby Model is the eco-cycle which describes environmental solutions used for energy, waste and water and sewage. It was established with a focus on 7 key areas: soil remediation, urban form, transportation, green buildings, energy, waste management, and water efficiency. (Ref. 1, 2, 11)