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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)

This project was the first green roof in the city of Bologna, and it has been carried out by the University of Bologna in collaboration with the Columbia University of New York with the aim to prove more evidence on green roof stormwater performance. For the Engineering School of Bologna University the existing roofs had a load capacity that was able to host only an extensive roof, without the costly need of being reinforced. In the extensive roof type the vegetation is usually very drought resistant and plants can adapt to difficult environmental conditions, therefore sedum was chosen (1).

There is an old tradition to preserve the wall gardens and patios in the center of Cordoba. Every year, the Festival of the Courtyards of Cordoba opens the courtyards to the public and various prizes are awarded to residents based on the plant and floral arrangement of the patios, bars, and balconies. This festival was declared as a UNESCO Intangible Heritage of Humanity in 2012. (Ref. 2,3)

The rain gardens of the Great Mosque give an example of a sustainable urban drainage system built 1000 years ago (Ref.1,8,9). The Great Mosque is a world heritage site by UNESCO (Ref. 1); therefore the rain gardens are protected and will continue to provide a sustainable irrigation system needed for the arid climate of Andalusia (Ref. 8,9).

Bundek Park is one of the urban planning projects aimed to create a recreational and sports area for the citizens and tourists to support a healthy lifestyle (Ref 3). The lake is surrounded by Bundek Park which stretches for 2,000 meters in length with an area of 35 hectares. The lake is about 5 hectares. the lake was initially used for fishing, walking and swimming. With the increased and carefree use of the lake, the lake and the environment became a waste disposal site. In 2005, by the decision of the Mayor, Mr. Milan Bandić, the renovation of Bundek began. The project included cleaning of the informal waste disposal site and shrubs blocking access to the lakes, renovation of the access to the lakes, planting flowers and introduction of the benches and water also to allow citizens to use the lake for recreation and enjoy the nature (Ref 2).

The Sotos de la Albolafia Natural Reserve is situated on a section along the Guadalquivir River, that runs from the Roman Bridge to the San Rafael Bridge (Ref. 3,14). It was declared Natural Monument in 2001 and is part of the Network of Protected Natural Areas of Andalusia (RENPA) due to its wide variety of birds (Ref. 5,15). "The declaration recognized the environmental value of the Sotos de la Albolafia, a singular natural enclave located in the urban center of a large city, in a monumental and historical environment also unique and with an unparalleled concentration in protected species, especially water birds and wetlands." (Ref. 3)

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).

Via Gandusio is a social housing complex in the North of Bologna that was originally built for hosting workers that migrate from South Italy in the 60s. Nowadays, it hosts two different communities: advanced-age Italians and current international immigrants. The differences create some conflicts and limits relationships among the community. In 2010 a group of researchers tried to implement a community garden that was designed with the aim of setting a meeting point for the community where food production is the link between neighbours to exchange knowledge, culture and experiences. The 250 m2 roof garden started in 2011 becoming the first of the city of Bologna and of Italy (Ref. 7 and 8).
Over the years the project has undergone changes and variations, has seen the end of funding and known voluntary management (2013). Since 2013 there is an urban vegetable garden cared for by some residents with the support of the Biodiversity association. (Ref.10)

“The park, inaugurated in May 2003, [was] part of a 1990s project aimed at recovering the ancient canal, combining social needs and providing a space for citizens to spend their free time.” (Ref. 7) It is located on the south bank of the Guadalquivir river (Ref. 7), and today serves as a space for “leisure, sports, and intergenerational coexistence” (Ref. 1)