Ecological restoration of ecosystems

The creation of Nyandungu Wetland Eco-Tourism Park is part of Rwanda’s efforts to restore and conserve ecosystems while promoting social-economic development. The Rwandese capital, Kigali, experiences regular flooding during rainstorms, due to the runoff from the surrounding urbanized hills, with the stormwater concentrating at the valley bottom in former wetlands. These floods cause disruption to traffic, preventing all travel between hillside communities. In order to address stringent issues, the focus turned on the wetlands surrounding the capital of the country. One of these wetlands is the Nyandungu wetland, which has suffered a lot of land use changes over the years, including agricultural activities, pasturing, cattle farms, sand mining, and wetland reclamation. From a climate change point of view, the project aims to address problems related with flooding and sustained base-flows in rivers. From a biodiversity point of view, the project aims to enhance biodiversity conservation. The main goal is the reconstruction of the Nyandungu Wetland Eco-Park with green infrastructure and services strategies for green energy, saving and recycling water, use of local and natural materials as well as architectural designs that maximize natural lighting and ventilation. (1,4)

The city of Bishkek once had the status of one of the greenest and most pleasant cities in the Soviet Union. The situation has deteriorated from year to year, so much so that in 2009 Bishkek was ranked sixteenth in the list of the thirty dirtiest cities in the world in a study published by The Blacksmith Institute, an American NGO which discloses each year an urban environment assessment report. This is why it seems urgent to us to react and work to protect, renovate and develop the green spaces of Bishkek. The proposed project aims to protect the unique forest of Bishkek called Karagachevaïa Rocha (“grove of elms”) and to redevelop it to make it an environmental education centre. This center, which would be the first of its kind in Kyrgyzstan, would include in the same place an arboretum, a leisure area as well as an animal park in which various rare or endangered species, present in Kyrgyzstan or in the countries of Central Asia, would be kept in semi-freedom. Karagachevaya Rocha has nearly 123 hectares in total, which is the largest green space in Bishkek and one of the oldest. This adds a symbolic character to the project. (3)

Recognising the benefits which urban forests bring to its citizens, Salvador has committed to protecting and restoring the Atlantic Forest, and has developed its own local framework which goes beyond national requirements (Ref. 1). The city has launched several programmes under its 'Salvador, Capital da Mata Atlantica' initiative, which together aim to restore the forest which has "suffered from severe deforestation" (Ref. 1). Included under the umbrella initiative are programmes such as the "'Delivery of trees', recovery of parks and collective planting" (Ref. 4).

The intervention targeted a section of the Dominguez Creek for restoration, with the aim of achieving a "multi-benefit project [which] creates passive and active recreation opportunities for park-poor communities, reestablishes native riparian plantings and captures stormwater before entering the channel along the Dominguez Creek in cities of Gardena and Hawthorne" (Ref. 2). Previously being characterised by the local community as a “Triple U” (Undesirable, Unsafe and Unusable) area, the project aimed to support a variety of environmental, sustainability, and humanitarian activities (Ref. 1). The nature-based solution interventions which were implemented as a result of the project mainly pertained to the planting of in situ trees, shrubs and groundcover plants; restoration of the riparian habitat; temporary installation of a "mini-urban forest for a shaded respite from the harsh downtown streetscape"; aiding in stormwater capture; conservation of water resources through using native plant species; and creating "watershed awareness" (Refs. 1, 2, 4, 5 and 8).

The City of Fort Collins is "taking steps to restore flows, fish passage, and ecological function" of Colorado's Cache la Poudre River (Ref. 6). The river was "heavily manipulated for irrigation and mining" throughout the early 20th century (Ref. 6), and today continues subject to the impacts of gravel mining, agriculture and urbanisation (Ref. 1). Regional climate change predictions further complicate our ability "to understand how the river’s hydrology and ecology may respond to warming climate scenarios" (Ref. 1).
The City of Fort Collins was, therefore "invested heavily in this urban river through extensive planning efforts, purchase of approximately 700 hectares of lands within the river’s floodplain, projects to address stormwater control and conveyance, water quality management, and acquisition of in-stream flow water rights", and in 2011, the City’s Natural Areas Department published the Cache la Poudre River Natural Areas Management Plan which outlined "opportunities and challenges in supporting the river’s ecological function and reducing risks to life and property during significant flood events", particularly through the implementation of nature-based solutions (Ref. 1). A suite of nature-based solutions has since been proposed and implemented by the City of Fort Collins, two of which are the Sterling Pond Ecological Restoration (also referred to as North Shields Ponds), and the McMurry Natural Area Ecological Restoration (Refs. 1 and 2).

Campinas is a fast-growing city and like many cities in Brazil, it confronts itself with many climatic incidents linked to a hotter and drier climate. In Campinas, in spite of the good performance of the city and the region in economic areas, there is a historical lack of urban landscape planning that integrates adequate social housing and areas that should be protected, such as riparian corridors, ecosystem remnants and other relevant green areas that offer ecosystem services in the urbanised context. Campinas has developed plans, projects and programmes to tackle regional, municipal and local issues related to environmental quality and offer green areas to the least privileged residents. Ecological corridors are being designed to connect forested fragments and/or relevant ecological areas to enable the genetic flow. The municipal green plan adopted the concept of a connectivity line to promote ecological corridors. (1,2)

Ecuador is considered one of the most biodiverse countries in the world (one of the 17th most diverse), due to the high diversity of their natural species. The country has around 23.056 taxonomic species of animals and plants reported, which constitutes the 6,1% of all species reported worldwide. (6) Quito, the country's capital makes no exception and is considered a biodiversity hotspot. In recent years, urban expansion has had a detrimental effect on the environment and the city’s ecology. All of these actions exacerbate the stresses on the different ecosystems, contaminate water sources and networks, and put the city’s capacity to supply ecosystem services at risk. To respond to many of these challenges the municipality of Quito initiated in 2020 a nature-based solution program under the EU framework of Clever Cities. (1) The project intends to position nature-based solutions as a means to improving public health, social cohesion, citizen security and increasing economic opportunities in those areas. (3)

As a result of a ReefFix Project, an Integrated Coastal Zone Management (ICZM) Coral Reef and Mangrove Restoration and Watershed Management Demonstration programme, the Three Bays Marine Protected Area (MPA) and associated Integrated Coastal Zone Management (ICZM) Plan have been established in Haiti (Refs. 4, 5 and 7). Only the second MPA to be established in the country, the Three Bays MPA includes the bays of Limonade, Caracol and Ft. Liberté (the administrative capital of the Nord-East department of Haiti), as well as the Lagon aux Boeufs. As summarised by Ref. 8, the establishment of the MPA and ICZM "will help protect the mangroves, eel grass beds, reefs and habitats housing important fisheries that are crucial for providing livelihoods to nearby communities. It will also help protect the area from storm surges and provide local communities with ecosystem services such as carbon sequestration, tourism value and more". Additionally, the MPA will afford protection to numerous threatened species, "including sea turtles, whales, manatees and migratory birds" (Ref. 8).

As of 2011, Windhoek, the capital of Namibia, has a population of approx. 330,000 people. By 2018, an estimated 40% of Namibia’s 2.4 million population were living in shacks and Windhoek makes no exception. Approximately 30% of the capital population lives in unplanned informal settlements struggling to access basic services such as water and sanitation. Worse than that informal settlements are especially vulnerable to environmental hazards: they are squeezed in next to each other on the slopes of mountainsides. When there's the occurrence of floods, they do so with such force and wash away people’s homes and their belongings. Even more distressing, people often lose their children due to rapid and unannounced flash floods. As a response to these threats and challenges the inhabitants of an informal settlement, Onyika (located in Okuryangava - which is a suburb of Windhoek, situated in the north of the capital city) paired with local authorities, donors and climate change experts to embark on a community-led process of creating a climate-resilient community. Being especially vulnerable to climate change, these forms of settlements require special attention in the development of climate resilience strategies. (1, 6)

Tongnan Dafosi Wetland Park is located on both sides of Fu River flowing through the central area of Chongqing Tongnan District. Its south side is right next to the national tourist spot – the Great Buddha Temple (Dafosi). Due to the increasing frequency and severity of extreme rainstorms, the area is prone to floods. To build an urban wetland park that is adaptive to floods, designers retained the original wetland environment along the river channel and set up pedestrian corridors to enable citizens’ close contact with wetland nature. [1, 3] This project excavates two important cultural elements of Tongnan: 1) the shipping culture with a long history; and 2) the Buddhist culture based on the Great Buddha Temple. [1]