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The University of Portsmouth Library extension project includes a green roof with sustainability features signed up to a Building Research Establishment Environmental Assessment Method (BREEAM) assessment. (3) The award-winning features include the rainwater collection system for flushing toilets and a sedum roof. (2)

The drought-tolerant garden was established by Portsmouth Water at its Head Office entrance in 2007. The plants in the garden, all of which require little or no watering, were chosen to be visually stimulating whilst contributing colour, scent and variation in leaf texture and shape (1). This garden has been designed to be drought-tolerant, easily maintained and can take some wear and tear. The planting reflects the changing seasons with something of interest all year. None of the plants is difficult to grow and is easily obtainable (2).

In 2017, Park Service of Portsmouth City Council has introduced a new approach to its annual 'In Bloom' campaign, aiming at increasing urban biodiversity, promoting pollinating insects and making the city more colourful (1,5).
As part of the initiative, 15 wildflower meadows have been created with information boards at various spots in the city including parks, gardens and schoolyards as well. Planted seed mixes had been carefully tested and selected to fit the local environmental conditions, including native species and promote pollination (5). The campaign has been appreciated by citizens and visitors of the Urban Meadows (5).
The urban meadows are planted as a part of an annual campaign (3)

The Pré Muché garden is part of the AJONC, Amis des Jardins Ouverts et néanmoins clôturés. This is the community garden of the St-Maurice Pellevoisin neighbourhood. Located behind the church of St-Maurice des Champs and the new Maison de quartier, Pré Muché has been in existence since 2007 on the initiative of the inhabitants. The garden is arranged according to the principles of the natural garden, a space that combines a place of life, cultivated plots and more wild areas. Its maintenance is ecological. It is a living garden where the pond meets the flowered meadow and the regional shrubs (Ref 2).

Douala is the economic capital of Cameroon and one of its largest cities. The city is located on the banks of the Wouri River (hence a port city) and its climate is tropical. The marine and coastal biodiversity of Cameroon is rich and diverse, and it is highly endangered because of human activities including artisanal and industrial fishing and pollution generated from industries, accidental loss of crude oil in transit or during loading or unloading. In Douala, thousands of inhabitants have settled in and around the mangrove swamps, destroying the mangrove ecosystem and endangering biodiversity including snakes, birds, fish, trees and frogs. Biodiversity studies are rare, and even if they exist, they are done in part and do not give an overview of the real state of biodiversity in the city. The city of Douala is full of many ecosystems of various natures (micro-ecosystems), each of which has species adapted to the environment. Besides this, Douala confronts itself with seasonal flooding and high temperatures due to climate change. In response to some of these challenges, a local entity, the Association of academics and researchers for Biodiversity conservation, initiated in 2020 an action that focused on environmental education and biodiversity conservation. The initiative also provides a framework for reflection and exchange on biodiversity issues. (1,3,4)

"The Conservatoire des Restanques is dedicated to preserving biodiversity (conservation orchard, forgotten vegetable garden, Mediterranean garden with the typical plant species of low limestone Provence) and to be a showcase of the current considerations of Sustainable Development (energy, waste management, water resources management, etc.). The development of the site and the different elements of the landscape make it possible to develop educational programs on the themes of flora diversity, wildlife, heritage conservation, food, consumption and health, eco-construction and energy management" (Ref. 3).

Having been awarded the LEED Gold certification, the President Place building is considered the greenest building in the city. The building has been designed to create an exceptional balance between work, life and the environment. The 9th and 13th levels of the building have green roofs and terraces. President Place selected climate-tolerant plants that can survive on natural rainfall, and thus the green roof system does not require a permanent irrigation system. Effective practices were considered during the installation of the green roof, such as mulch for trees to conserve moisture, choosing plant species that can easily adapt to the site and need less irrigation. Trees have also been planted on the ground level. Additionally, the building is surrounded by permeable paving to help rainwater percolate easily. The aim was to create a visually appealing office building that leads the way in environmental, design-led construction in Saigon. [1, 2]

Restructuring a public derelict land into few private vegetable and fruit gardens. The gardeners practice organic gardening making it more sustainable. This provides foods as well as increasing the soil fertility, and reduction of the soil erosion. This also creates some extra vegetable and fruit market in the city. 20 % of the food produced is donated to the food bank. The project is a community project which also helps to bring people together. Started in April 2012 (Ref 1,4). The project is one of the initiatives by the Greek municipalities allotting land to local citizens with the purpose of increasing food security for the underprivileged, educating the younger generation, and providing their citizens with a retreat from city life (Ref 3).

Wertach Vital is a project to reconstitute the Wertach river between the southern Augsburg limits and its confluence with the river Lech. Starting from the south, the flood protection has been improved, the depth of the river bottom has been halted, the river bed has been expanded and the banks have been upgraded as a recreational area. A major part of the measures has been completed. The project is supported by the Free State of Bavaria and the City of Augsburg, co-financed by the EU (Ref. 1).

The project was born with the idea of solving the huge debate around the creation of a city park that connects different parts of the city. The area close to the railway will be regenerated thanks to an above-ground park. This solution will allow to have a new green space in the city, and an additional panoramic view that will be experienced thanks to a new cycling path. In this way the whole area that surrounds the rails of the central station will be regenerated, providing at the same time an attempt to mend the urban and social fabric. (Ref.1.)