Joint implementation (e.g. tree planting)

Indonesia’s peatlands are among the most vulnerable ecosystems on Earth and also have significant potential as carbon sinks (1,2). Fire risk in Sumatra's peatland areas is high due to canals that were dug for logging and plantation development (1,2). The Sumatra Merang Peatland Project was thus launched to restore the area as the massive forest fire in 2015 destroyed thousands of hectares of biodiverse tropical forest (1). This project includes restoring more than 22,900 hectares of peatland rainforest in the Merang region, located within Musi Banyuasin Province, South Sumatra in Indonesia (1,2,3). The project targets the Merang biodiversity corridor, one of the largest and deepest peat swamps in South Sumatra, which protects an area more than 3.5 times the size of Manhattan (New York City) (1,2,3). This project is a part of the Althelia Climate Fund and was implemented on the ground by Indonesian Companies named PT Global Alam Lestari (GAL) and Forest Carbon (1,2,3,4,5). The project aims and contributes to climate change mitigation and ecosystem resilience by peat rewetting and reforestation, protecting biodiversity and working with local communities to build and improve livelihoods (1,3).
The first stage of the project is considered completed and is considered to achieve positive impacts already, but it still aims to upscale certain activities until 2025 (3,4,5). The total lifetime of the project extends to 2062 (4).

The rehabilitation of the Klang River or Selangor Maritime Gateway (SMG) is a project that was put into effect in 2018 by the Selangor State Government. The project aimed to transform the Klang River, considered the most polluted river in Malaysia, into a beautiful and clean river which can be a new source of economic growth in the state of Selangor, Malaysia. The river has been polluted with trash, plastic bottles, and sewage, which harmed the vegetation and the aquatic ecosystem (1). The project proved to be highly complex as it included rehabilitation of the river through several green solutions such as the creation of a community park, the conservation of various species of mangroves, and the implementation of riverfront greens as a measure of slope protection. The intervention is set to be developed on an area of 56 Km along the Klang River corridor. It is expected to promote and support the integrated management of river basins with particular emphasis on ensuring that biodiversity and wetland conservation and community considerations are incorporated into river basin management that includes the development of eco-city (3,5,6). Furthermore, the project intends to conduct an awareness campaign about river cleaning and rehabilitation activities to educate the public on the importance of rivers and the environment in our lives while consequently highlighting the critical state of pollution faced by the River (1).

Nazarbayev University (NU) launched the Green Campus (GC) project in 2016 to promote environmental sustainability (2). The GC concept is based on principles of the sustainable development and aims to focus on the greenhouse gas emissions reduction and waste management processes (1, 5). The university has established a Green Campus office, a Green Campus University Committee and the NU Green Society for the implementation of the project (2).

One of the main activities of the Green Campus is organizing tree-planting events on campus. To date, more than 1000 trees have been planted, with funds donated by university sponsors or raised via the collection and recycling of campus wastepaper [3, 4]. Additionally, the initiative also implemented a separate waste collection process for six types of waste: paper, plastic, glass, metal, batteries, and light bulbs. The collected waste is sent for recycling to selected companies [2].

Before Earth Day, NU also hosts an annual Green Week in April, to promote sustainability practices within its community. The Green Week program typically includes eco-talks by experts, workshops, garage sales, vegetarian food fairs, eco-trips, art exhibitions, and environmental movie screenings [2, 4, 5]. Climate Week, training courses, and Climate Launchpad are also part of the university's green initiatives to educate students on environmental practices [5].

In 2021, the local municipal government of Navi Mumbai City and a local NGO converted a neglected urban space used as a dump yard in Nisarg Udyan into a healthy and dense forest (Ref 1,2). The aim of the project was to improve biodiversity and complement the local ecosystem, choosing specifically native species from the local area for plantation (Ref 3). By applying the Miyawaki forest technique, the project was able to transform the wasteland into a 3-acre mini-forest quickly. A civic officer on behalf of the Navi Mumbai Municipal Corporation (NMMC) drove the re-forestation project jointly with the support of Green Yatra, a local NGO, and corporate social responsibility (CSR) funding support from Sony Music Entertainment (Ref. 1, 3).

The Ecological Education Center (EEC) is a nationally recognized institution committed to promoting awareness and sustainability through its environmental education programs in Mongolia. As the only organization in the country dedicated to providing such programs, the EEC operates under the National University of Mongolia (NUM) and was founded in 1957 as the "Central Station of Young Naturalists". With over 60 years of experience in environmental education, the EEC offers its programs not only to NUM students but also to children of varying ages. Since 2011, the center has developed and introduced various cognitive-based environmental training programs, providing visitors with interactive learning opportunities that takes them through different learning stations. The EEC has several facilities to support the learning experience, including a nature experience garden, a greenhouse, and a small zoological museum. The nature experience garden is continuously enriched with new tree species each year, and as a result, it is now home to over 3500 trees and bushes of 30 different species. In addition to its educational programs, the EEC also provides advice on gardening and plant care to further promote environmental sustainability. (Ref. 1, 2, 3)

In 2010, to revamp the Raja Musa Forest Reserve (RMFR), a rehabilitation project was initiated by the Friends of North Selangor Peat Swamp Forest Association (a local NGO) in collaboration with governmental and non-governmental stakeholders. As part of the largest peat swamp forest complex on the West Coast of Peninsular Malaysia, the Raja Musa Forest Reserve (RMFR) is an important home to many threatened species, as well as a valuable ecosystem in the fight against global warming. Despite this, over the years the forest has been subjected to fires and illegal encroachment which severely reduced its area (1). The project was considered unique as it was an innovation aimed to enhance and strengthen the capacity of the local community in peatland water management and forest rehabilitation works (3,5). Activities included among others rehabilitation of the degraded peat forest through the plantation of new seedlings, demonstration of, and provision of a documentary model for community-based peat swamp forest rehabilitation, as well as the creation of an awareness programme with the local community and dissemination of educational materials (2).
The importance of the intervention consists not only in the implementer's approach in regard to nature-based solutions but also in its aim of documenting a "model of low-cost hydrologic restoration of peat swamp forest" which ultimately should be replicated in similar conditions but in various locations (2).

Bangladesh is a country prone to floods and waterlogging, which results in two-thirds of this nation's land being transformed into wetlands each year. As such, much land becomes unavailable and the restricted access to it causes food insecurity as well as severe environmental pressure on the flora, fauna and ecosystems. The impact is even more serious as agriculture is one of the most important contributors to Bangladesh's GDP (1).
To respond to most of the climate challenges and food insecurities, in 2007 the International Union for Conservation of Nature (IUCN) and the humanitarian agency Care International, alongside other partners (including the Bangladeshi government), launched floating gardening (artificial islands, that simply rise and fall with the swelling waters) pilot project in the peri-urban area of the Gopalganj and other close by districts (1,2).
Floating gardens known locally as Baira are an old practice of crop cultivation in the wetlands of Bangladesh, the previous agricultural land, which got destroyed by the floods. The practice consists of piling together a number of dense layers of aquatic weeds like water hyacinth, duckweed, or paddy stubs and letting them decay. Afterwards, they're combined with silt and cow dung and inserted with plant/vegetable seeds left to flourish. On these beds, farmers cultivate fruits and vegetables like turmeric and ginger as well as okra, bitter gourd, snake gourd, spinach, and brinjal. In addition to veggies, rice seedlings can occasionally be raised. As a result, floating gardens are available to everyone, affordable, dependable, and completely in harmony with nature. (2,3) Furthermore, this aquatic farming practice has been shown to be highly effective in tackling the consequences of climatic variability and climate change like prolonged water-logging (3). The intervention has benefited approx. 2,000 families in the district of Gopalganj and it has opened the route for further projects that supported the practice of floating gardens (4).

In 2017, the city of Jakarta initiated a peri-urban farming program under its Urban Agriculture Program that aimed to achieve sustainable agricultural production, rural economic sustainability and long-term environmental sustainability (1,4).
South Jakarta is one of the five administrative units that form Jakarta is a prosperous city with more than 2.2 mils. inhabitants. Industrial production as well as urbanization developed quickly in the city, leading to a steep increase in population. Meanwhile, the city experiences a reduction in agricultural land converted into settlements and industrial land, as well as soil deterioration. The city needs agricultural land for production and to establish food security. Furthermore, it needs to improve air pollution as well as oxygen provisioning. As such a solution had to be found (1).
To implement the program a total of 12 communities in the South Kebayoran Lama subdistrict of South Jakarta participated in implementing and operating urban farms. One of these communities has been the Kebayoran Lama Selatan Urban Village managed by Seruni Indah Farmers Group (Kelompok Tani Seruni Indah) which is a very successful example of sustainable organic urban farming supporting more than 3500 residents. The engagement consisted in using vacant and private yard land for horticultural crops (vegetables, fruits and ornamental plants), spices, medicines, herbs etc. through hydroponic and conventional practices that could benefit the community and the general public. 15 gardens have been implemented with funding provided by the Indonesian government (3, 7).

The United Nations High Commissioner for Refugees (UNHCR) and its partners collaborated in 2018 to develop an ecosystem restoration project in the Rohingya Camps of Ukhiya, near Cox's Bazar. The main objective of this project was to mitigate the increased risk of landslides, slope instability, and flooding caused by flash floods and the vicinity of the Bakkhali River. The intervention included the planting of quickly growing native trees, shrubs, and grass species. Additionally, the project encompassed other measures such as vegetable cultivation on stream beds, biological soil stabilization methods, and plant-based wastewater treatments. To ensure the sustainability of the project, a network of future practitioners from the Bangladeshi and Rohingya communities was created. Moreover, environmental education and awareness activities were undertaken to complement the efforts of the project, with a particular focus on engaging young people from both the host and refugee communities to maximize its impact. The area where the project was implemented has been significantly affected by land and forest degradation over the last few decades, which has been exacerbated since the arrival of Rohingya refugees in 2017. Therefore, the project also involved other stakeholders such as the International Center for Conservation of Nature (IUCN), the Danish Refugee Council, the World Food Programme, the International Organization for Migration, and the Bangladesh government, each contributing in various capacities to achieve the project's objectives. (1,2,3,4)

The Community Garden Project was proposed in 2018 by Samyuktha Kannan (a resident of Chennai City) to the Resident Welfare Association (RWA), which is a non-governmental organization (NGO) of Kasturba Nagar (1,2,3). The RWA uses the community hall of a public park of Kasturba Nagar to host meetings and community events, but the area was surrounded by open dry land and an unmanaged field (1,2). This open area surrounding the community hall was then assigned to develop a community garden of 1500 square feet (1,2,3). This project aimed to serve as a shared garden place to bring along residents of all age groups to enjoy gardening and simultaneously create opportunities to learn and share knowledge through social engagement and reconnect with nature (1,2). Although implemented and completed in 2019, the project still continues to contribute towards sustainability through further development and introduction of eco-friendly elements and activities, as well as the involvement of various stakeholders for support (3,4).