Collection of monitoring data continuously throughout the project to aid evaluation

The Green Ventilation Corridors network in Stuttgart, Germany is an implemented nature-based solution coupled with regulatory policies and incentives. Within this initiative, Green ventilation corridors were created to enable fresh air to sweep down from hills surrounding the city (4).

The indoor green wall installed at the University of Natural Sciences in Lublin. Apart from its decorative and aesthetical functions, the wall will serve educational and research purposes. The wall consists entirely of moss and does not require watering. It will be monitored regularly to analyse the impact of light conditions for proper growth and development of plants in these type of installations [1,2].

The first external green wall in Lublin was installed at the University of Natural Sciences in September 2015, and it was later followed by two smaller installations inside and outside in 2017 [5]. Apart from their decorative and aesthetical functions, the walls serve educational and research purposes, as the suitability of the chosen plants for the Polish climate conditions will be evaluated for similar urban projects in the country. Finally, the project promotes urban greenery and certain offsetting for grey infrastructure [1, 2, 3, 5].

The initiative involves establishing beehives on the roofs of the Catholic University of Lublin and the Centre for the Meetings of Cultures. It seeks to provide the habitat for the bees in the city, help in pollination, educate the society about the bees and shape more ecologically-friendly attitudes among the students, faculty and visitors. It should also produce honey that can be sold or distributed free of charge, which can serve in a promotional tool of the two institutions. The Centre for the Meetings of Cultures has additionally opened a garden to provide food for the pollinators [1,2,3,4,6]. In 2020, the initiative is still ongoing and expanding. Every year, the university organizes a competition about the life of bees for various age groups [7].

A number of studies were carried out since 1984 to determine a suitable flood prevention scheme for the White Cart Water and its tributary to provide protection up to the 1 in 200 years event (corresponding to protection up to 1 in 100 years event by 2050s, according to considered climate change projections). In 2002 the development of the scheme began with the help of consulting engineers. The resulting White Cart Water Flood Prevention Scheme, the largest flood protection scheme in Scotland, was published in November 2004 and approved by the Scottish Government in 2006 (Ref 1). Phases 1 and 2 of the White Cart Water Flood Prevention Scheme were completed by late 2011 as part of Glasgow City Council's strategy, working with other key stakeholders, to reduce flood risk to residents and businesses in the south side of Glasgow. In 2017, Glasgow City Council secured funding to enable the completion of the third and final phase of the scheme. This phase involves the construction of 9 sections of flood defence - a combination of flood defence walls and embankments which will provide direct flood defence along sections of both the White Cart Water and Auldhouse Burn. Through 2017 the project team has been finalising the design and undertaking surveys etc. The project is currently ongoing (Ref 3).

The project assumes planting roses and other flowery shrubs in the Szczecin's district of Kijewo. Characterized by heavy traffic, the area has benefited from 'rose gardens' along its main roads and neighbourhood squares as a way of mitigating the traffic noise. The rose gardens serve as natural acoustic screens for noise reduction. The initiative additionally aims to enhance the aesthetics of the area and the image of the Szczecin's city - in line with its long-term brand management strategy "Szczecin floating garden 2050". According to the initiators of the project, it refers to the tradition of roses, which would decorate the same neighbourhood in the past [1].

Due to the challenges caused by climate change, Hamburg decided to become greener and developed a comprehensive, pioneering green roof strategy. The strategy aims at creating 100 hectares of new green walls by 2019 by providing grants for building owners for greening roofs and offering them rain water fee reduction owing to the rain water retention of the green roofs. (Reference 1) The financial support offered until the end of 2019 is 3 million EUR. (Reference 2) The services offered by the city in this plan consist of four pillars: promotion (financial incentive), dialogue, regulation, and scientific support. (Reference 7)

Manchester’s Stevenson Square was given a green makeover. In addition to securing funds from Manchester City Council, the project underwent a substantial crowd fundraising campaign to transform the square into an ‘urban oasis’ and provide street trees, permeable pavements and planters.The pavement was extended on one side of Stevenson Square which enabled street trees to be planted. More tree planting undertook on the central reservation and a green roof was designed to collect and store rainwater. Self-irrigating hanging baskets were installed on lamp posts (ref 4).

The city of Salford has experienced several floods and is at risk of flooding once every 100 years (Ref1). The majority of properties in the city that lie in a high-risk flood zone are in the floodplain of the Irwell. The UK's Environment Agency and the council, designed a flood prevention scheme which included temporary water storage areas which will store floodwater on the existing Castle Irwell playing fields and public open space, and double as sports area otherwise (Ref 5). It aimed to have its own wetland and wildlife habitat, and will help protect hundreds of homes and businesses (Ref 4).

Three London Plane trees were planted in a specially designed trench in Howard Street, Salford, Greater Manchester in 2015 with the aim of capturing the impact that trees had on both cleaning polluted water from road runoff and managing levels of surface water, which can lead to flooding when not properly managed (ref 1). This project in the City of Salford was created to study how trees can aid in the management of urban stormwater as a novel retrofitted street tree demonstration (ref 3). It was led by Manchester's City of Trees movement. (Ref 3)