Green Lima
Lima Verde is one of the pillars of the metropolitan mayor's government plan and is supported by SERPAR. It aims to reforest hillsides, hills, and central berms of metropolitan and local roads, as well as public recreational spaces, to create urban lungs that generate oxygen and scenic beauty for the benefit of the health of all residents (Ref 1, 3). Its goal is to plant one million trees in four years (2022 - 2026) in different parts of North, East and South Lima (Ref 3, 5, 6). This project is being carried out to respond to the increasing problem of urban heat islands that are being generated, especially in the most vulnerable districts where there is no shade due to a shortage of trees (Ref 1, 4). It is therefore focused on areas where the environmental quality is low, where the pollution is high and where there is more danger of higher temperatures (Ref 1, 7).
This programme aims to include youth volunteers, district municipalities, educational institutions, grassroots social organisations, neighbourhood leaders, residents and other entities that favour environmental conservation (Ref 1, 2, 3, 5).
This programme aims to include youth volunteers, district municipalities, educational institutions, grassroots social organisations, neighbourhood leaders, residents and other entities that favour environmental conservation (Ref 1, 2, 3, 5).
Tbilisi Urban Forest (Narikala Ridge Forest)
The Tbilisi Urban Forest is an ecological restoration project of 5,5 ha spanning two pilot areas initiated in 2020. Located on Mtatsminda ridge around Tbilisi, it is part of a larger reforestation effort within the 700-ha forest territory (Ref. 1,2). The project is funded by the Cartu Foundation and led by the Development and Environment Foundation along with Tbilisi City Hall. Restoration is undertaken to addresses significant challenges such as forest dieback caused by pest infestations, climate change adaptation as well as the creation of recreational infrastructure (Ref. 3,5). Through collaboration among interdisciplinary scientists and urban planners, a novel reforestation strategy has been developed that integrates patches of locally sourced plant communities tailored to diverse soil and slope conditions. This approach incorporates existing trees with new saplings, carefully grafted into existing soil pockets, and focuses on a biodiverse palette of endemic and climate-adapted species (Ref. 1,5). While the project implementation could not be carried out as planned, lacking public participartory due to Covid 19, still 100 jobs were created locally (Ref. 2). Ultimately, the Urban Forest project will enhance ecological connectivity, biodiversity and tourism and also serve the public as an improtant recreational site (Ref. 1,2).
Monsanto Forest Park's Management Plan
The Monsanto Forest Park Management Plan focuses on enhancing the Monsanto Forest Park as an urban ecosystem, thereby improving ecological health and biodiversity while promoting sustainable resource use and integration with urban areas. Key interventions include managing invasive species, preventing forest fires, and supporting native habitats. The plan also aims to improve recreational and educational facilities, reduce automobile traffic, and enhance public accessibility. It aims to cover conservation efforts, recreational use and urban integration as well as promoting the park as a model for sustainable urban forestry. The implementation is overseen by the Lisbon City Council. (Ref 1,4).
In 2021, this historic urban forest received the Forest Management Recertification under the Forest Stewardship Council®, "the most important global certification in terms of environmental compliance of forestry operations (Ref. 6).
In 2021, this historic urban forest received the Forest Management Recertification under the Forest Stewardship Council®, "the most important global certification in terms of environmental compliance of forestry operations (Ref. 6).
A wood for the city: the urban forest of Mount Urpinu
In the city of Cagliari, in the location of Mount Urpinu, 6400 new trees have been planted. The project, initiated in 2022, sought to restore the area's biodiversity and to revitalize the park for the benefits of the citizens (Refs. 1, 3 & 8). In fact, in previous years, the park has been subject to various environmental and social hazards because of its conditions: the area has been subject to wildfires and abandoned wastes, and with time, it became a gathering point for drug addicts and homeless people, thus becoming unsafe for citizens and especially for children (Refs. 1 & 6).
Therefore, the Metropolitan City of Cagliari decided to reclaim the area and plant thousands of trees of various species (holm oaks, oaks, pine, carob and olive trees) over more than 6 hectares of land (Refs. 3 & 8). The project's goal is to restore biodiversity, mitigate temperatures, decrease air pollution, and increase citizens' sense of community (Ref. 1).
Therefore, the Metropolitan City of Cagliari decided to reclaim the area and plant thousands of trees of various species (holm oaks, oaks, pine, carob and olive trees) over more than 6 hectares of land (Refs. 3 & 8). The project's goal is to restore biodiversity, mitigate temperatures, decrease air pollution, and increase citizens' sense of community (Ref. 1).
Living Wall at the New Street Train Station
Air pollution is one of the most pressing sustainability challenges in the UK, with particulate levels exceeding both WHO guidelines and EU safe limits in many cities (Ref 6). In 2014, Birmingham was identified by the WHO as one of nine UK cities breaching air pollution safety guidelines (Ref 2, 3).
In 2012, a soil-based green wall was installed at Birmingham New Street Train Station as part of a project aimed at improving air quality, as diesel train services contribute significantly to nitrogen oxide (NOx) pollution. However, most of the plants did not survive. In 2017, Network Rail commissioned a private company to reconstruct the wall using a hydroponic system (Ref 3). The new green wall was installed in 2018 and completed in May 2019 (Ref 1, 3).
This hydroponic green wall not only enhances the urban environment with calming green infrastructure, but also helps mitigate air pollution and promotes biodiversity with the addition of 16,600 plants (Ref 1, 2, 3).
In 2012, a soil-based green wall was installed at Birmingham New Street Train Station as part of a project aimed at improving air quality, as diesel train services contribute significantly to nitrogen oxide (NOx) pollution. However, most of the plants did not survive. In 2017, Network Rail commissioned a private company to reconstruct the wall using a hydroponic system (Ref 3). The new green wall was installed in 2018 and completed in May 2019 (Ref 1, 3).
This hydroponic green wall not only enhances the urban environment with calming green infrastructure, but also helps mitigate air pollution and promotes biodiversity with the addition of 16,600 plants (Ref 1, 2, 3).
The Rio Salado Habitat Restoration Area
The Rio Salado Habitat Restoration Area is a urban green space that transformed a former 5-mile-long city dump into a thriving riparian corridor (2, 3, 7, 9). The project, spearheaded by the City of Phoenix in collaboration with the U.S. Army Corps of Engineers, Maricopa County Flood Control District, and the Arizona Water Protection Fund, has revitalized a degraded ecosystem (9). Through decades of concerted effort, involving government agencies, non-profits such as the Arizona Sustainability Alliance, and community engagement, the area has been restored to a lush habitat supporting diverse wildlife, including over 200 bird species (1, 2, 7). The project aimed to mitigate the pressing issues of urban heat, air pollution, and habitat loss that Phoenix grappled with (1). By creating green spaces, improving air quality, and offering recreational opportunities, the Rio Salado Habitat Restoration Area stands as a testament to the power of collaborative conservation and community resilience (1, 6, 7, 9). The restoration area now boasts hiking and biking trails, a nature center, and various educational programs, making it a community space (3, 7, 9).
Da Nang Tree Planting Initiative
Danang, a prosperous port city in Central Vietnam, is home to a population of 1.2 million inhabitants. Throughout the years, the city went through several boats of urbanization, which allowed its economy to thrive but its environment to be negatively impacted. The city's green areas were reduced, leading to socioeconomic and environmental impacts, including loss of landscape and more energy consumption. (4) Furthermore, the city became vulnerable to natural disasters, which caused destruction and uprooting of trees and vegetation and aggravated soil erosion. (3,4)
To counteract many of these issues, the municipality of Danang initiated several greening activities that included the creation of parks, the greening of street alleys, and the greening of schoolyards as a supporting mechanism for one of Vietnam's nationwide programmes "Plant 1 billion trees in the 2021 - 2025" (5). Recently, the municipality planted 900 Than Mat trees (one of the typical flowering plants of Son Tra Peninsula and scientifically known as Millettia nigrescens Gagnep) along the route from Green Lake to Bai Bac, in the Tho Quang ward, in February 2023. The activity also aims to have an educational role as tree protection is highlighted and build a clean and green city environment (6).
So far, as of February 2023, as part of the 1 billion tree programme, 15,000 trees have been planted in Danang. (2)
To counteract many of these issues, the municipality of Danang initiated several greening activities that included the creation of parks, the greening of street alleys, and the greening of schoolyards as a supporting mechanism for one of Vietnam's nationwide programmes "Plant 1 billion trees in the 2021 - 2025" (5). Recently, the municipality planted 900 Than Mat trees (one of the typical flowering plants of Son Tra Peninsula and scientifically known as Millettia nigrescens Gagnep) along the route from Green Lake to Bai Bac, in the Tho Quang ward, in February 2023. The activity also aims to have an educational role as tree protection is highlighted and build a clean and green city environment (6).
So far, as of February 2023, as part of the 1 billion tree programme, 15,000 trees have been planted in Danang. (2)
IKEA's biodiverse extensive rooftop garden
IKEA opened its doors in Budapest in 1990. This was the very first store in Hungary. Twelve years later, the store announced that it would install a green roof. The main purpose of the green roof was to compensate the locals for the loss of green space. The green roof was intended to create a biologically active surface that fits in aesthetically into the suburban landscape and provide a home for animals such as pollinators. The green roof, built in 2002, was covered with a Sedum carpet. In 2014, when the original Sedum vegetation died out, the green roof was completely removed. Then, during the autumn 2014 planting, four types of Sedum shoots were seeded. This was followed in the spring of 2015 by the seeding of herbaceous dicots seed mixes, which contained seeds of roughly 50 plant species. The vegetation is regularly monitored by ecologists: in 2021, more than 160 different taxa were recorded, including spontaneously occurring species. The green roof is closed, not accessible to the public, however tours are occasionally organized for professionals [3] [6] [8] [9] [10] [11].
Green Roof of Banyuwangi International Airport
Banyuwangi International Airport in East Java is the first green airport in Indonesia and was recognized with an award from the Aga Khan Award for Architecture (AKAA) in 2021-22, the world's oldest and most prestigious architecture awards (1,2,3,4). This project was designed and implemented by Architect Andra Matin in 2018 as a corporate social responsibility project for the Banyuwangi Regional Government, Java, Indonesia (1,2,4). The project building was extensively inspired by the houses of the local Osing tribe (1,2). The project aimed to embody a highly efficient passive design, with its remarking green roof feature of a total area of 4765m2 that is planted with grass and routinely maintained (1,2,3,5,6). The green roofs act like a sponge for heat, light and water and conserve energy by maintaining a constant temperature inside the building, and as a result, the airport does not require air conditioning in the main area (5). The green roof of the airport improves air quality as it captures airborne pollutants and atmospheric deposition, and the plants on green roofs also filter noxious gases (5). The eco-friendly airport terminal construction utilizes 'Fast Flow Siphonic System', especially for conventional roof drainage (5). The regional government declared a 10 km radius 'No Development Zone' around the project, protecting the existing paddy fields and villages, which is an exceptional move given the general tendency to exploit land around airports commercially (1,2). The current airport site caters to around 300,000 passengers annually and allows for future expansion to accommodate up to 3 million passengers without encroaching on the No Development Zone (2).
Pollution Mitigation at the Altynalmas Goldmines
The Sustainable Kazakhstan Research Institute (SKRI) at Narxoz University has developed "phytocapture," an innovative solution to deal with airborne dust. A phytocapture barrier is a chain of green spaces around a plant or mine, precisely calculated in height and width, to capture dust and organic compounds from production. This solution can capture 40% of particulate matter, including fine particulate matter, which otherwise settle in people's lungs, causing pulmonary and cardiovascular diseases. (1,6) To demonstrate the solution's applicability, SKRI proposed a phytobarrier project to AK Altynalmas JSC for the Aksu Goldmine. The Aksu field was founded in 1939, and soon the miners' settlement was formed around it. The formation of the tailings pond is closely connected with the production process, which began in 1951 and until now is produced by feeding through the pulp line the pulp from the gold concentration plant of the mill. The existing measures to reduce the negative impacts of tailing management facilities, such as irrigation of technological roads of the tailing management facility, as well as compliance with the above-ground stockpiles in the sections, do not fully solve this problem (5). To tackle this issue, the proposed phytocapture project utilized 3D computer modelling and digital technology to design a vegetation barrier near the tailing dump on both sides and resulted in the plantation of 1,400 seedlings of elm, silver sucker, and maple at a distance of 1.5 kilometers. The project was implemented at two production sites of the company in 2022 and is also being implemented in other projects. In 2022, the joint project was recognized by the United Nations Economic Commission for Europe (ECE) as a best practice (1,6).
