Inconclusive as the project is still undergoing implementation, or is still on its planning stages

The Mobile Tree Trail is a nature-based solutions (NBS) initiative aimed at preserving Mobile, Alabama’s urban forest while celebrating its cultural and ecological heritage (Ref 1, Ref 2). First established in the early 1990s by volunteers, the original trail featured 24 iconic trees, selected for their historical significance, environmental value, and beauty (Ref 1, Ref 2). Over the years, some trees were lost to development and storms, and the trail faded into obscurity (Ref 1, Ref 4).
From 2021, the Mobile Tree Commission, with support from The Nature Conservancy, is leading efforts to revive the trail (Ref 3, Ref 6). Activities include reviewing past entries, opening public nominations, and selecting new trees that best represent Mobile’s identity (Ref 3, Ref 4). The project emphasises inclusivity and public participation, welcoming volunteers and local input to shape a trail that evolves with the city (Ref 4, Ref 6).
Mobile faces environmental threats such as hurricanes, urban expansion, and loss of native tree cover (Ref 1, Ref 6). The revitalised trail helps address these challenges by promoting awareness, conserving old-growth specimens like the 300-year-old Duffie Oak, and maintaining vital green spaces (Ref 4, Ref 6).
The Mobile Tree Trail blends education, tourism, and conservation, enhancing urban resilience while telling the city’s story through its trees (Ref 3, Ref 6).

Bayou La Batre, also known as the seafood capital of Alabama, has been facing severe flooding problems, including the occurence of combined sewerage overflows. The Nature Conservancy has secured funding to install a green stormwater project in Bayou La Batre, adjacent to the library, sports fields and the community center. Alongside the aim of the green stormwater project to decrease flooding events in the community by infiltrating water, it also serves as an education and engagement project [1]

The Lower Perdido Islands – Bird, Robinson and Walker Islands – are located in the Perdido Pass, in Orange Beach. The area is a popular destination, attracting many visitors due to its blue-green water and diverse wildlife, which, however, leads to erosion from boat wakes and marine debris. Its popularity impacts these wildlife habitats, including the seagrasses, marsh and forests which provide habitat for nesting birds and nurseries for local fish. Therefore, the Nature Conservancy, the City of Orange Beach, Moffatt & Nichol, and Olsen Associates Inc. started working together in 2017 to create a conservation management plan for the Perdido Islands, as well as develop some restoration initiatives to support this critical habitat for the future [1,3]. This Lower Perdido Islands' restoration project is part of a larger Perdido Bay Watershed restoration plan [2]

Located southeast of Bayou La Batre, Coffee Island is a barrier island that provides a buffering capacity for shorelines in Mobile County [5]. Since 1950, the shoreline on the island has been eroding. In response, the Nature Conservancy has put in a ‘’living shoreline’’ construction in 2010 to reduce wave energy and decrease erosion the island has been facing [1]. A ‘’living shoreline’’, ‘’refers to the use of nature-based techniques and materials such as oyster shells, reef blocks, bagged shells, live shellfish, and plants to help protect eroding shorelines’’ [2]. While the living shorelines constructed in 2010 still provide habitat benefits, these efforts no longer protect the shoreline from erosion. This in turn threatens not only the island's buffering capacity, but also the integrity of the marsh on the island [5]. Therefore, the Nature Conservancy has secured funding for a second project on the island, the Coffee Island Restoration project (in 2023) that aims to implement a (longer) 5,000-foot living shoreline breakwater, including the use of ‘’super sacks’’ – a specific kind of sediment barriers functioning as dikes – to protect the coastline while enhancing habitat [4, 6]

The creation of the AGOA Sanctuary was first envisioned in 2006, officially established in 2010, and continues to evolve as a vital initiative for marine conservation. Located in the waters of the French Antilles, the sanctuary encompasses the entire Exclusive Economic Zone of Martinique, Guadeloupe, Saint-Martin, and Saint-Barthélemy. Spanning 143,256 square kilometers, it is the second-largest marine protected area in France, just behind the Coral Sea Natural Park in New Caledonia.
AGOA was established to ensure a favorable conservation status for marine mammals, aiming to protect both the species and their habitats through a combination of direct and indirect actions. The sanctuary’s long-term strategy is grounded in five core principles: reducing harmful interactions between human activities and marine mammals; enhancing scientific understanding of these species, their habitats, and the pressures they face; increasing public awareness and disseminating knowledge about the sanctuary; strengthening collaboration with governmental agencies for effective surveillance and enforcement; and fostering regional cooperation with Caribbean nations under the Cartagena Convention and its SPAW Protocol.
Together, these guiding principles reflect AGOA’s commitment to sustainable stewardship of marine biodiversity in the French Antilles, creating a lasting sanctuary for marine mammals in the Caribbean. (1, 2, 3)

The Ecological & Citizen Restoration Project in Carbet, led by ASSOMER, supports the city in sustainably developing its coastline. This coastal area serves multiple purposes—recreational, economic, and subsistence—making it essential to include the voices of its key user communities: fishermen, restaurateurs, residents, and tourists.
However, both these uses and critical spawning habitats are increasingly threatened by coastal erosion, which is worsened by urbanization. Beyond reducing nesting areas, urban expansion also creates light pollution, which disrupts nesting females and hatchlings that rely on moonlight reflections to navigate.
This project was selected during the inaugural Biodiversity Lottery, a French government initiative inspired by the Heritage Lotto (established in 2018). The funds will be dedicated to protecting Carbet’s turtle population. Key efforts include reforesting the beach to combat erosion and creating new nesting spaces for turtles.
By restoring vegetation in a way that addresses multiple environmental challenges, this initiative aims to raise public awareness and ensure long-term coastal preservation. (1,2)

Pollution from roadways is often carried by rainwater into gullies, which then direct this runoff to the nearest watercourse, ultimately polluting local rivers and degrading water quality (1). To address this issue, Dublin City Council is exploring potential green infrastructure solutions to reduce roadway pollution in rivers, focusing on nine pilot sites within the Dodder catchment area (1). Green infrastructure has the advantage of treating pollutants before they enter rivers or watercourses, which can significantly improve water quality in the area (1).
In addition to enhancing water quality, green infrastructure helps manage flood risks by slowing water flow to rivers, which can lessen the frequency and severity of flood events (1). These green spaces also foster biodiversity, creating more pleasant and ecologically supportive environments for the community (1). As an added benefit, green infrastructure serves as an important climate change adaptation strategy (1).
Upon completion of these pilots, Dublin City Council plans to expand successful methods to other locations across the city and potentially further afield (1). The project will involve creating new green spaces, enhancing existing ones, and transforming certain hard surfaces, all of which will contribute to protecting the Dodder and Santry rivers. By treating roadway runoff before it reaches the rivers, the initiative will also offer valuable benefits to the local community (2).
The proposed changes will be designed to support health and well-being, provide informal play areas, attract desirable wildlife, reduce flood risks, and help urban areas adapt to the impacts of climate change (2). The Council also plans to monitor the performance of these green infrastructure measures to assess their effectiveness in filtering pollutants from roadway runoff (1).

The financial capital of Sri Lanka, Colombo, is the fastest-growing city in Sri Lanka, and as such, it is constantly changing. Most expansions in urban areas are taking place without proper planning, which can cause damage to existing pockets of forests, landscapes and green areas in and around the city (1). The environmental impacts of this rapid urbanisation include increased pollution, increased heat due to the expansion of roads/pavements, tall structures that block out light and wind and reduced biodiversity in fauna and flora (1).
To face these challenges, the Federation of Environmental Organisations (FEO) proposed a city-wide Tree Planting Campaign to create an Urban Forest Strategy in public and private lands in the greater Colombo area (1). The plan is to kick-start the program at the Borella Cemetery as it has a large land area available for planting, specifically 178062 sq meters (3). The project started to be implemented in July 2020 with the seasonal rains (1). This project aims to grow urban trees to help mitigate some of the negative impacts of unplanned and rapid urbanisation, thus making the city more resilient to these changes (1).
The trees that will be planted will be mostly native species and also exotic plants will be selected based on specific requirements (1, 3). It is also planned to have flowering plants and shrubs to encourage butterflies, bees and birds to interspace the trees (1). The new parking space near the Borella Cemetery will also be planted with deep root shading trees interspaced with flowering plants (1).
The project aimed to include a large number of stakeholders including the government, the private sector and the residents of Colombo (1). And they have also reached schools in Colombo and hope to involve environmental associations to further the cause (3).

Lisbon is facing an increasing threat linked to climate change due to its geographical location and climate (6), which has had a negative impact on health and quality of life in the city (5). Its average annual precipitation is decreasing, although the city experiences more winter precipitation. This results in longer droughts and more seasonal flooding, which reduces water retention and soil conservation (6). Average temperatures are increasing by 14°C per year, with maximum temperatures up to 5°C higher (6).
As an adaptation measure to these challenges, the LIFE LUNGS project aims to increase Lisbon's resilience by implementing green infrastructure and promoting related ecosystem services (1, 3, 5, 6). Thus, it focuses on measures aimed at coping with temperature increase, mitigating the effects of heat waves and water scarcity, which are expected to become more frequent, being in line with the climate policies adopted by the municipality. The project runs from 2019/2020 to 2024/2025 (1, 5, 6). It aims to address cross-cutting issues such as climate, water and biodiversity (3). The project expects to work hand in hand with the City of Malaga, which has been developing projects aimed at adapting the city to climate change. It is expected to replicate the work in Malaga and post-project to 2 national territories, and 1 in the EU (4). It is also intended to transfer the project work to be implemented in private areas that are part of Lisbon's green infrastructure, and to disseminate and technically train municipalities of the Lisbon Metropolitan Area and other municipalities committed to climate change adaptation (4).

Located between the Rotes Rathaus, Karl-Liebknecht-Straße, Nikolai Quarter, Spreeufer and the television tower, the old founding centre of Berlin is one of the capital's most important urban open spaces. This open space between the TV tower and the Spree is being redesigned on the basis of an international open space planning competition and many years of public participation. With further development, this touristically significant location in the historic centre of Berlin will undergo a climate-resilient redesign and upgrade with great design and functional quality. (Ref. 1)
The listed areas of the Rathausforum and the Marx-Engels-Forum will in future be connected to form a continuous ribbon of open space that runs from Alexanderplatz to the Spree. Central areas will be unsealed and green spaces will be created that can be used in a variety of ways, which will also be attractive places to spend time and improve the microclimate. Trees and shrubs will be planted on already existing and new green areas. The aim is to respectfully consider the numerous visible and hidden historical references and at the same time transform the site into a sustainable urban open space that combines a high quality of recreation, sustainability and culture. Next to plants, a new rainwater management system is being implemented that stores rainwater and uses the created green spaces to evaporate water. Playgrounds and a water fountain are further additions to a new recreational area. (Ref. 3; Ref. 4; Ref. 5)
The project is characterized by a years-long participation process. Around 10.000 citizens participated in feedback rounds, workshops, dialogues, and information sessions in which they could voice they wishes and ideas for the area. The project is implemented and organized by the state-owned company Grün Berlin, which engage with various stakeholders since 2015. Preparations for the construction start in late 2024 and the project is expected to be finished in 2030. (Ref. 5; Ref. 9)