The Million Tree Initiative refers to the ongoing environmental projects that multiple cities have individually committed to and aimed at expanding urban forestry through the planting of one million trees. This initiative is part of a higher global movement, not only does it intend to act and diminish climate change, it also plans to lower both the urban heat as well as also enhance the air quality in many places. [1] Cities that are known to be currently involved in this initiative are: Los Angeles, Denver, New York City, Shanghai, London, Ontario, and Amherst, New York. A common motive shared between these participating cities is, according to their mission statements, the reduction of carbon dioxide in the air to reduce the effects of global warming. Beyond these environmental advantages, these effort to plant the trees, also shows signs and effects when it comes to biodiversity, improving public health, and fostering sustainable urban development. [2] [3]
In May 2006, Mayor Antonio Villaraigosa made Million Trees LA one of his campaign promises. This initiative was planned to plant trees between 2006 and 2010 and the trees were expected to provide environmental benefits and were predicted to continue to grow until 2040. [4] This campaign is important and can increase urban woods as a piece of infrastructure that can assist cities in mitigating their environment. [5] The purpose of this initiative will also reduce emissions and save energy. [6] The Los Angeles project is funded by a mix of federal money and municipal funding, charities, and corporate donations. It was one of among forty winners from 200 nominees to obtain a United States Environmental Protection Agency (EPA) Environmental Award in 2009. [7]
The Mile High Million, an initiative started by then Mayor John Hickenlooper, is a similar program in Denver, Colorado. This was announced by Hickenlooper in his 2006 State of the City Address. [8] This Initiative helped these trees be implemented in forests in Los Angeles and even other cities like New York. [9]
On April 22, 2007, Mayor Michael Bloomberg revealed goals of planting one million trees by 2017 as part of PlaNYC , a plan designed for the sustainability of New York City. [10] In the same year, China began its own tree planting program for Shanghai, with the same goal for one million trees. After that, London also began the million tree initiative program in 2011.
The planning process involves local city governments, NGOs, businesses, and community nonprofit organizations. [11] Environmentalists, ecologists, and urban planners have also contributed to this initiative. [12] The Million Tree Initiative, began with one of the steps of planting trees in local residential areas, urban parks, and other natural areas. [13] The work and maintenance is distributed to people who have agreed to live in those or near those areas to participate by helping and taking care of and maintaining the trees. [14] [15] [16] Many of the materials and necessities for planting the trees are provided by the local governments and involved organizations. [17] [18]
Ongoing monitoring and tracking of the trees' growth and health are crucial to ensure their success. [19] [20] Some programs include regular assessments to measure the initiative's effectiveness. [21] Since the maturity of the trees influences the effectiveness of their purpose, these trees had to be maintained for periods of time so that the goal of the initiative is successful. [22] To guarantee the initiative’s long-term success, ongoing efforts may involve regular maintenance, additional tree planting, and adapting strategies to address changing environmental conditions. [23]
This Million Tree Initiative is also seen as a display of how the government is progressing to solve urban sustainability, as well as global climate change problems. [24] Local governments such as Los Angeles and New York City, implemented these projects to help reduce carbon emissions, clean air, and fight urban heat islands with mass tree planting. [25] [26] Such programs are inextricably linked with larger environmental objectives like California's climate goals and New York's "PlaNYC," an overarching effort to make the city more resistant to climate effects. [27] They further illustrate the growing political salience of nature-based solutions for urban governance, with city governments playing a major role in global environmental governance. [28] While they face similar challenges of funding and political opposition, they are viewed as small examples of collaboration between local, federal, and private initiatives. [29] [30]
The Million Tree Initiative has also had global effects, and one example is the Paris Agreement, this agreement helps recognize cities that are contributing to global efforts and reducing carbon emissions and footprints. [31] The investment in these trees also helps citices better adapt to rising temperatures, energy conservation, decrease of air and water pollution, and better property values. [32] Some of the socioeconomic benefits of tree planting is that people can come together as a community and improve public spaces and this could even promote green jobs and motivate people to engage more when it comes to climate movements and funds. [33]
The Million Tree Initiative has also significantly impacted the climate in many ways. [34] One way is through a process in which trees perform an act known as a carbon sink. [35] This process happens when a tree absorbs the carbon dioxide from the atmosphere and stores it into their biomass. [36] [37] The trees have also been known to reduce heat emissions and are a useful cooling source. [38] The shade from the trees and the reduced temperature both reduced over 100,000 megawatt-hours in many neighborhood locations for many years. [39] These improved changes have also helped decrease over 100,000 tons of avoided carbon emissions. [40]
Not only do the trees improve air quality through the photosynthesis process, but studies have shown that in just about a year, a mature tree can absorb half a metric ton of carbon dioxide. [41] The health of the ecosystem can also be improved. [42] This is because by planting more trees, a biodiversity of the type of trees used can be increased and the survival rate of wildlife can increase due to a wider range of habitat and improved climate quality. [43]
Urban areas usually experience the urban heat island (UHI) effect, that is, they are significantly warmer than surrounding rural areas. The temperature difference is usually larger at night than during the day, and is most apparent when winds are weak, under block conditions, noticeably during the summer and winter. The main cause of the UHI effect is from the modification of land surfaces while waste heat generated by energy usage is a secondary contributor. Urban areas occupy about 0.5% of the Earth's land surface but host more than half of the world's population. As a population center grows, it tends to expand its area and increase its average temperature. The term heat island is also used; the term can be used to refer to any area that is relatively hotter than the surrounding, but generally refers to human-disturbed areas.
Reforestation is the practice of restoring previously existing forests and woodlands that have been destroyed or damaged. The prior forest destruction might have happened through deforestation, clearcutting or wildfires. Three important purposes of reforestation programs are for harvesting of wood, for climate change mitigation, and for ecosystem and habitat restoration purposes. One method of reforestation is to establish tree plantations, also called plantation forests. They cover about 131 million ha worldwide, which is 3% of the global forest area and 45% of the total area of planted forests.
Urban agriculture refers to various practices of cultivating, processing, and distributing food in urban areas. The term also applies to the area activities of animal husbandry, aquaculture, beekeeping, and horticulture in an urban context. Urban agriculture is distinguished from peri-urban agriculture, which takes place in rural areas at the edge of suburbs.
Urban forestry is the care and management of single trees and tree populations in urban settings for the purpose of improving the urban environment. Urban forestry involves both planning and management, including the programming of care and maintenance operations of the urban forest. Urban forestry advocates the role of trees as a critical part of the urban infrastructure. Urban foresters plant and maintain trees, support appropriate tree and forest preservation, conduct research and promote the many benefits trees provide. Urban forestry is practiced by municipal and commercial arborists, municipal and utility foresters, environmental policymakers, city planners, consultants, educators, researchers and community activists.
Agroforestry is a land use management system that integrates trees with crops or pasture. It combines agricultural and forestry technologies. As a polyculture system, an agroforestry system can produce timber and wood products, fruits, nuts, other edible plant products, edible mushrooms, medicinal plants, ornamental plants, animals and animal products, and other products from both domesticated and wild species.
Afforestation is the establishment of a forest or stand of trees in an area where there was no recent tree cover. There are three types of afforestation: natural regeneration, agroforestry and tree plantations. Afforestation has many benefits. In the context of climate change, afforestation can be helpful for climate change mitigation through the route of carbon sequestration. Afforestation can also improve the local climate through increased rainfall and by being a barrier against high winds. The additional trees can also prevent or reduce topsoil erosion, floods and landslides. Finally, additional trees can be a habitat for wildlife, and provide employment and wood products.
An urban forest is a forest, or a collection of trees, that grow within a city, town or a suburb. In a wider sense, it may include any kind of woody plant vegetation growing in and around human settlements. As opposed to a forest park, whose ecosystems are also inherited from wilderness leftovers, urban forests often lack amenities like public bathrooms, paved paths, or sometimes clear borders which are distinct features of parks. Care and management of urban forests is called urban forestry. Urban forests can be privately and publicly owned. Some municipal forests may be located outside of the town or city to which they belong.
Carbon sequestration is the process of storing carbon in a carbon pool. It plays a crucial role in limiting climate change by reducing the amount of carbon dioxide in the atmosphere. There are two main types of carbon sequestration: biologic and geologic.
Ulmus 'Homestead' is an American hybrid elm cultivar raised by Alden Townsend of the United States National Arboretum at the Nursery Crops Laboratory in Delaware, Ohio. The cultivar arose from a 1970 crossing of the Siberian Elm Ulmus pumila with the hybrid N 215, the latter grown from seed sent in 1960 to the University of Wisconsin-Madison elm breeding team by Hans Heybroek of the De Dorschkamp Research Institute in the Netherlands. Tested in the US National Elm Trial coordinated by Colorado State University, 'Homestead' averaged a survival rate of 85% after 10 years in the US National Elm Trial. However, planting of the tree was not recommended, owing principally to its 'ugly' shape and susceptibility to Southwest injury. 'Homestead' was released to commerce without patent restrictions in 1984.
Ulmus 'Morton Red Tip' is a hybrid cultivar raised by the Morton Arboretum from an open pollination of Ulmus 'Morton'. The tree has occasionally been reported as a hybrid of Accolade with the Siberian Elm Ulmus pumila, an error probably owing to the commercial propagation of the tree by grafting onto U. pumila rootstocks. Tested in the US National Elm Trial coordinated by Colorado State University, Danada Charm averaged a survival rate of 77.5% after 10 years.
Forest management is a branch of forestry concerned with overall administrative, legal, economic, and social aspects, as well as scientific and technical aspects, such as silviculture, forest protection, and forest regulation. This includes management for timber, aesthetics, recreation, urban values, water, wildlife, inland and nearshore fisheries, wood products, plant genetic resources, and other forest resource values. Management objectives can be for conservation, utilisation, or a mixture of the two. Techniques include timber extraction, planting and replanting of different species, building and maintenance of roads and pathways through forests, and preventing fire.
A branch collar is the "shoulder" between the branch and trunk of woody plants; the inflammation formed at the base of the branch is caused by annually overlapping trunk tissue. The shape of the branch collar is due to two separate growth patterns, initially the branch grows basipetally, followed by seasonal trunk growth which envelops the branch.
Asplundh Tree Expert, LLC is an American company which specializes in tree pruning and vegetation management for utilities and government agencies. The company also performs utility line construction and maintenance, electrical systems testing, traffic signal and highway lighting construction and maintenance, automated metering infrastructure and home energy management program implementation.
Urban reforestation is the practice of planting trees, typically on a large scale, in urban environments. It may also include urban horticulture and urban farming.
i-Tree is a collection of urban and rural forestry analysis and benefits assessment tools. It was designed and developed by the United States Forest Service to quantify and value ecosystem services provided by trees including pollution removal, carbon sequestration, avoided carbon emissions, avoided stormwater runoff, and more. i-Tree provides baseline data so that the growth of trees can be followed over time, and is used for planning purposes. Different tools within the i-Tree Suite use different types of inputs and provide different kinds of reports; some tools use a 'bottom up' approach based on tree inventories on the ground, while other tools use a 'top down' approach based on remote sensing data. i-Tree is peer-reviewed and has a process of ongoing collaboration to improve it.
Trunk injection or endotherapy also known as vegetative endotherapy, is a method of target-precise application of pesticides, plant resistance activators, or fertilizers into the xylem vascular tissue of a tree with the purpose of protecting the tree from pests, or to inject nutrients to correct for nutrient deficiencies. This method largely relies on harnessing the tree's vascular system to translocate and distribute the active compounds into the wood, canopy and roots where protection or nutrition is needed.
The desert-covered Kingdom of Saudi Arabia is the geographically largest country in the Middle East. Moreover, it accounts for 65% of the overall population of the GCC countries and 42% of its GDP. Saudi Arabia does not have a strong history in environmentalism. Thus, as the number of population increases and the industrial activity grows, environmental issues pose a real challenge to the country.
Stephanie Pincetl is an American academic specializing in the intersection of urban policy and the environment, particularly in California. She is the Director of the UCLA Center for Sustainable Urban Systems in Los Angeles.
Urban forest inequity, also known as shade inequity or tree canopy inequity, is the inequitable distribution of trees, with their associated benefits, across metropolitan areas. This phenomenon has a number of follow-on effects, including but not limited to measurable impacts on faunal biodiversity and the urban heat island effect. Urban heat inequity occurs when intra-urban heat islands, with their associated negative physical and emotional health consequences, are more common and more intense in lower-income communities.
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