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A garden cultivated on permaculture principles

Permaculture is an approach to land management and settlement design that adopts arrangements observed in flourishing natural ecosystems. It includes a set of design principles derived using whole-systems thinking. It applies these principles in fields such as regenerative agriculture, town planning, rewilding, and community resilience. The term was coined in 1978 by Bill Mollison and David Holmgren, who formulated the concept in opposition to modern industrialized methods, instead adopting a more traditional or "natural" approach to agriculture.[1][2][3]

Permaculture has been criticised as being poorly defined and unscientific.[4] Critics have pushed for less reliance on anecdote and extrapolation from ecological first principles, in favor of peer-reviewed research to substantiate productivity claims and to clarify methodology. Peter Harper from the Centre for Alternative Technology suggests that most of what passes for permaculture has no relevance to real problems.[5] Defenders of permaculture reply that researchers have concluded it to be a “sustainable alternative to conventional agriculture,” that it “strongly” enhances carbon stocks, soil quality, and biodiversity, making it “an effective tool to promote sustainable agriculture, ensure sustainable production patterns, combat climate change and halt and reverse land degradation and biodiversity loss.”[6] They further point out that most of permaculture’s most common methods, such as agroforestry,[7] polycultures,[8] and water harvesting features[9] are also backed by peer-reviewed research.

Background

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History

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Franklin Hiram King introduced the term "permanent agriculture" in 1911

In 1911, Franklin Hiram King wrote Farmers of Forty Centuries: Or Permanent Agriculture in China, Korea and Japan, describing farming practices of East Asia designed for "permanent agriculture".[10] In 1929, Joseph Russell Smith appended King's term as the subtitle for Tree Crops: A Permanent Agriculture, which he wrote in response to widespread deforestation, plow agriculture, and erosion in the eastern mountains and hill regions of the United States. He proposed the planting of tree fruits and nuts as human and animal food crops that could stabilize watersheds and restore soil health.[11] Smith saw the world as an inter-related whole and suggested mixed systems of trees with understory crops. This book inspired individuals such as Toyohiko Kagawa who pioneered forest farming in Japan in the 1930s.[12] Another pioneer, George Washington Carver, advocated for practices now common in permaculture, including the use of crop rotation to restore nitrogen to the soil and repair damaged farmland, in his work at the Tuskegee Institute between 1896 and his death in 1947.[13][14][15]

In his 1964 book Water for Every Farm, the Australian agronomist and engineer P. A. Yeomans advanced a definition of permanent agriculture as one that can be sustained indefinitely. Yeomans introduced both an observation-based approach to land use in Australia in the 1940s and in the 1950s the Keyline Design as a way of managing the supply and distribution of water in semi-arid regions. Other early influences include Stewart Brand's works, Ruth Stout and Esther Deans, who pioneered no-dig gardening, and Masanobu Fukuoka who, in the late 1930s in Japan, began advocating no-till orchards and gardens and natural farming.[16][17]

Bill Mollison, who has been described as the "father of permaculture," cites Aboriginal Tasmanian belief systems as an inspiration of the practice.[1]

In the late 1960s, Bill Mollison, senior lecturer in Environmental Psychology at University of Tasmania, and David Holmgren, graduate student at the then Tasmanian College of Advanced Education started developing ideas about stable agricultural systems on the southern Australian island of Tasmania. Their recognition of the unsustainable nature of modern industrialized methods and their inspiration from Tasmanian Aboriginal and other traditional practises were critical to their formulation of permaculture.[1][2][3][18] In their view, industrialized methods were highly dependent on non-renewable resources, and were additionally poisoning land and water, reducing biodiversity, and removing billions of tons of topsoil from previously fertile landscapes. They responded with permaculture. This term was first made public with the publication of their 1978 book Permaculture One.[18][19]

Permaculture is a philosophy of working with, rather than against nature; of protracted and thoughtful observation rather than protracted and thoughtless labor; and of looking at plants and animals in all their functions, rather than treating any area as a single product system.[20]

— Bill Mollison

Following the publication of Permaculture One, Mollison responded to widespread enthusiasm for the work by traveling and teaching a three-week program that became known as the Permaculture Design Course. It addressed the application of permaculture design to growing in major climatic and soil conditions, to the use of renewable energy and natural building methods, and to "invisible structures" of human society. He found ready audiences in Australia, New Zealand, the USA, Britain, and Europe, and from 1985 also reached the Indian subcontinent and southern Africa. By the early 1980s, the concept had broadened from agricultural systems towards sustainable human habitats and at the 1st Intl. Permaculture Convergence, a gathering of graduates of the PDC held in Australia, the curriculum was formalized and its format shortened to two weeks. After Permaculture One, Mollison further refined and developed the ideas while designing hundreds of properties. This led to the 1988 publication of his global reference work, Permaculture: A Designers Manual. Mollison encouraged graduates to become teachers and set up their own institutes and demonstration sites.[21] Critics suggest that this success weakened permaculture's social aspirations of moving away from industrial social forms. They argue that the self-help model (akin to franchising) has had the effect of creating market-focused social relationships that the originators initially opposed.[22]

Foundational ethics

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The ethics on which permaculture builds are:[23][24]

  1. "Care of the Earth: Provision for all life systems to continue and multiply".[23]
  2. "Care of people: Provision for people to access those resources necessary for their existence".[23]
  3. "Setting limits to population and consumption: By governing our own needs, we can set resources aside to further the above principles".[23]

Mollison's 1988 formulation of the third ethic was restated by Holmgren[24] in 2002 as "Set limits to consumption and reproduction, and redistribute surplus" and is elsewhere condensed to "share the surplus".[25]

Permaculture emphasizes patterns of landscape, function, and species assemblies. It determines where these elements should be placed so they can provide maximum benefit to the local environment. Permaculture maximizes synergy of the final design. The focus of permaculture, therefore, is not on individual elements, but rather on the relationships among them. The aim is for the whole to become greater than the sum of its parts, minimizing waste, human labour, and energy input, and to and maximize benefits through synergy.[26]

Permaculture design is founded in replicating or imitating natural patterns found in ecosystems because these solutions have emerged through evolution over thousands of years and have proven to be effective. As a result, the implementation of permaculture design will vary widely depending on the region of the Earth it is located in. Because permaculture's implementation is so localized and place specific, scientific literature for the field is lacking or not always applicable.[27] Design principles derive from the science of systems ecology and the study of pre-industrial examples of sustainable land use.[28][29]

A core theme of permaculture is the idea of "people care". Seeking prosperity begins within a local community or culture that can apply the tenets of permaculture to sustain an environment that supports them and vice versa. This is in contrast to typical modern industrialized societies, where locality and generational knowledge is often overlooked in the pursuit of wealth or other forms of societal leverage.[30]

The tragic reality is that very few sustainable systems are designed or applied by those who hold power, and the reason for this is obvious and simple: to let people arrange their own food, energy and shelter is to lose economic and political control over them. We should cease to look to power structures, hierarchical systems, or governments to help us, and devise ways to help ourselves. - Bill Mollison[30]

Theory

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Design principles

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Holmgren articulated twelve permaculture design principles in his Permaculture: Principles and Pathways Beyond Sustainability:[31]

  • Observe and interact: Take time to engage with nature to design solutions that suit a particular situation.[31]
  • Catch and store energy: Develop systems that collect resources at peak abundance for use in times of need.[31]
  • Obtain a yield: Emphasize projects that generate meaningful rewards.[31]
  • Apply self-regulation and accept feedback: Discourage inappropriate activity to ensure that systems function well.[31]
  • Use and value renewable resources and services: Make the best use of nature's abundance: reduce consumption and dependence on non-renewable resources.[31]
  • Produce no waste: Value and employ all available resources: waste nothing.[31]
  • Design from patterns to details: Observe patterns in nature and society and use them to inform designs, later adding details.[31]
  • Integrate rather than segregate: Proper designs allow relationships to develop between design elements, allowing them to work together to support each other.[31]
  • Use small and slow solutions: Small and slow systems are easier to maintain, make better use of local resources, and produce more sustainable outcomes.[31]
  • Use and value diversity: Diversity reduces system-level vulnerability to threats and fully exploits its environment.[31]
  • Use edges and value the marginal: The border between things is where the most interesting events take place. These are often the system's most valuable, diverse, and productive elements.[31]
  • Creatively use and respond to change: A positive impact on inevitable change comes from careful observation, followed by well-timed intervention.[31]

Guilds

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Mycorrhizal fungi usually function in a mutualistic symbiotic relationship with plants.
Ladybugs are seen as beneficial insects in permaculture because of their help with aphid control.

A guild is a mutually beneficial group of species that form a part of the larger ecosystem. Within a guild each species of insect or plant provides a unique set of diverse services that work in harmony. Plants may be grown for food production, drawing nutrients from deep in the soil through tap roots, balancing nitrogen levels in the soil (legumes), for attracting beneficial insects to the garden, and repelling undesirable insects or pests.[32][33] There are several types of guilds, such as community function guilds, mutual support guilds, and resource partitioning guilds.[34]

  • Community function guilds group species based on a specific function or niche that they fill in the garden. Examples of this type of guild include plants that attract a particular beneficial insect or plants that restore nitrogen to the soil. These types of guilds are aimed at solving specific problems which may arise in a garden, such as infestations of harmful insects and poor nutrition in the soil.[34]
  • Establishment guilds are commonly used when working to establish target species (the primary vegetables, fruits, herbs, etc. you want to be established in your garden) with the support of pioneer species (plants that will help the target species succeed). For example, in temperate climates, plants such as comfrey (as a weed barrier and dynamic accumulator), lupine (as a nitrogen fixer), and daffodil (as a gopher deterrent) can together form a guild for a fruit tree. As the tree matures, the support plants will likely eventually be shaded out and can be used as compost.[34]
  • Mature guilds form once your target species are established. For example, if the tree layer of your landscape closes its canopy, sun-loving support plants will be shaded out and die. Shade loving medicinal herbs such as ginseng, Black Cohosh, and goldenseal can be planted as an understory.[34]
  • Mutual support guilds group species together that are complementary by working together and supporting each other. This guild may include a plant that fixes nitrogen, a plant that hosts insects that are predators to pests, and another plant that attracts pollinators.[34]
  • Resource partitioning guilds group species based on their abilities to share essential resources with one another through a process of niche differentiation. An example of this type of guild includes placing a fibrous- or shallow-rooted plant next to a tap-rooted plant so that they draw from different levels of soil nutrients.[34]

Zones

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Permaculture zones 0-5

Zones intelligently organize design elements in a human environment based on the frequency of human use and plant or animal needs. Frequently manipulated or harvested elements of the design are located close to the house in zones 1 and 2. Manipulated elements located further away are used less frequently. Zones are numbered from 0 to 5 based on positioning.[35]

Zone 0
The house, or home center. Here permaculture principles aim to reduce energy and water needs harnessing natural resources such as sunlight, to create a harmonious, sustainable environment in which to live and work. Zone 0 is an informal designation, not specifically defined in Mollison's book.[35]
Zone 1
The zone nearest to the house, the location for those elements in the system that require frequent attention, or that need to be visited often, such as salad crops, herb plants, soft fruit like strawberries or raspberries, greenhouse and cold frames, propagation area, worm compost bin for kitchen waste, etc. Raised beds are often used in Zone 1 in urban areas.[35]
Zone 2
This area is used for siting perennial plants that require less frequent maintenance, such as occasional weed control or pruning, including currant bushes and orchards, pumpkins, sweet potato, etc. Also, a good place for beehives, larger-scale composting bins, etc.[35]
Zone 3
The area where main crops are grown, both for domestic use and for trade purposes. After establishment, care and maintenance required are fairly minimal (provided mulches and similar things are used), such as watering or weed control maybe once a week.[35]
Zone 4
A semi-wild area, mainly used for forage and collecting wild plants as well as production of timber for construction or firewood.[35]
Zone 5
A wilderness area. Humans do not intervene in zone 5 apart from observing natural ecosystems and cycles. This zone hosts a natural reserve of bacteria, molds, and insects that can aid the zones above it.[35][36]

Edge effect

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The edge effect in ecology is the increased diversity that results when two habitats meet.[37] Permaculturists argue that these places can be highly productive. An example of this is a coast. Where land and sea meet is a rich area that meets a disproportionate percentage of human and animal needs. This idea is reflected in permacultural designs by using spirals in herb gardens, or creating ponds that have wavy undulating shorelines rather than a simple circle or oval (thereby increasing the amount of edge for a given area).[38] On the other hand, in a keyhole bed, edges are minimized to avoid wasting space and effort.[37]

Common practices

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Hügelkultur

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Sketch of a Hügelkultur bed

Hügelkultur is the practice of burying wood to increase soil water retention. The porous structure of wood acts like a sponge when decomposing underground. During the rainy season, sufficient buried wood can absorb enough water to sustain crops through the dry season.[39][40][41] This technique is a traditional practice that has been developed over centuries in Europe and has been recently adopted by permaculturalists.[42] The Hügelkultur technique can be implemented through building mounds on the ground as well as in raised garden beds. In raised beds, the practice "imitates natural nutrient cycling found in wood decomposition and the high water-holding capacities of organic detritus, while also improving bed structure and drainage properties." This is done by placing wood material (e.g. logs and sticks) in the bottom of the bed before piling organic soil and compost on top. A study comparing the water retention capacities of Hügel raised beds to non-Hügel beds determined that Hügel beds are both lower maintenance and more efficient in the long term by requiring less irrigation.[43]

Sheet mulching

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Main article: Sheet mulching
Preparation of a sheet mulch
Tomato plants growing on a "lasagna" or sheet mulch

Mulch is a protective cover placed over soil. Mulch material includes leaves, cardboard, and wood chips. These absorb rain, reduce evaporation, provide nutrients, increase soil organic matter, create habitat for soil organisms, suppress weed growth and seed germination, moderate diurnal temperature swings, protect against frost, and reduce erosion.[44] Sheet mulching or lasagna gardening[45] is a gardening technique that attempts to mimic the leaf cover that is found on forest floors.[44][46]

No-till gardening

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Further information: No-dig gardening
Not to be confused with No-till farming.

Edward Faulkner's 1943 book Plowman's Folly,[47] King's 1946 pamphlet "Is Digging Necessary?",[48] A. Guest's 1948 book "Gardening without Digging",[49] and Fukuoka's "Do Nothing Farming" all advocated forms of no-till or no-dig gardening.[50] No-till gardening seeks to minimise disturbance to the soil community so as to maintain soil structure and organic matter.[51][52]

Cropping practices

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Further information: Crop rotation, Intercropping, and Companion planting

Low-effort permaculture favours perennial crops which do not require tilling and planting every year. Annual crops inevitably require more cultivation. They can be incorporated into permaculture by using traditional techniques such as crop rotation, intercropping, and companion planting so that pests and weeds of individual annual crop species do not build up, and minerals used by specific crop plants do not become successively depleted.[53]

Companion planting aims to make use of beneficial interactions between species of cultivated plants.[54] Such interactions include pest control, pollination, providing habitat for beneficial insects, and maximizing use of space; all of these may help to increase productivity.[55]

Rainwater harvesting

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Further information: Rainwater harvesting
Rainwater collection is a common practice of permaculture.

Rainwater harvesting is the accumulation and storage of rainwater for reuse before it runs off or reaches the aquifer.[56] It has been used to provide drinking water, water for livestock, and water for irrigation, as well as other typical uses. Rainwater collected from the roofs of houses[57] and local institutions can make an important contribution to the availability of drinking water. It can supplement the water table and increase urban greenery. Water collected from the ground, sometimes from areas which are specially prepared for this purpose, is called stormwater harvesting.[58]

Greywater is wastewater generated from domestic activities such as laundry, dishwashing, and bathing, which can be recycled for uses such as landscape irrigation and constructed wetlands. Greywater is largely sterile, but not potable (drinkable).[59]

Keyline design is a technique for maximizing the beneficial use of water resources. It was developed in Australia by farmer and engineer P. A. Yeomans. Keyline refers to a contour line extending in both directions from a keypoint. Plowing above and below the keyline provides a watercourse that directs water away from a purely downhill course to reduce erosion and encourage infiltration.[60] It is used in designing drainage systems.[61]

Compost production

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Healthy population of red wigglers in a vermicomposting bin

Vermicomposting is a common practice in permaculture. The practice involves using earthworms, such as red wigglers, to break down green and brown waste. The worms produce worm castings, which can be used to organically fertilize the garden. Worms are also introduced to garden beds, helping to aerate the soil and improve water retention. Worms may multiply quickly if provided conditions are ideal.[62][63] For example, a permaculture farm in Cuba began with 9 tiger worms in 2001 and 15 years later had a population of over 500,000.[64] The worm castings are particularly useful as part of a seed starting mix and regular fertilizer. Worm castings are reportedly more successful than conventional compost for seed starting.[63]

Sewage or blackwater contains human or animal waste. It can be composted, producing biogas and manure. Human waste can be sourced from a composting toilet, outhouse or dry bog (rather than a plumbed toilet).[65]

Economising on space

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Further information: Herb spiral
A herb spiral provides varied conditions in a small space for multiple species to grow together.

Space can be saved in permaculture gardens with techniques such as herb spirals which group plants closely together. A herb spiral, invented by Mollison, is a round cairn of stones packed with earth at the base and sand higher up; sometimes there is a small pond on the south side (in the northern hemisphere). The result is a series of microclimate zones, wetter at the base, drier at the top, warmer and sunnier on the south side, cooler and drier to the north. Each herb is planted in the zone best suited to it.[66][67]

Domesticated animals

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See also: Rice-duck farming
Chicken roaming in an herb garden

Domesticated animals are often incorporated into site design.[68][69] Activities that contribute to the system include: foraging to cycle nutrients, clearing fallen fruit, weed maintenance, spreading seeds, and pest maintenance. Nutrients are cycled by animals, transformed from their less digestible form (such as grass or twigs) into more nutrient-dense manure.[69]

Multiple animals can contribute, including cows, goats, chickens, geese, turkey, rabbits, and worms. An example is chickens who can be used to scratch over the soil, thus breaking down the topsoil and using fecal matter as manure. Factors such as timing and habits are critical. For example, animals require much more daily attention than plants.[70]

Fruit trees

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Masanobu Fukuoka experimented with no-pruning methods on his family farm in Japan, finding that trees which were never pruned could grow well, whereas previously-pruned trees often died when allowed to grow without further pruning.[71][72] He felt that this reflected the Tao-philosophy of Wú wéi, meaning no action against nature or "do-nothing" farming. He claimed yields comparable to intensive arboriculture with pruning and chemical fertilisation.[71][73]

Applications

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Agroforestry

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Agroforestry in Burkina Faso, with maize under trees

Agroforestry uses the interactive benefits from combining trees and shrubs with crops or livestock. It combines agricultural and forestry technologies to create more diverse, productive, profitable, healthy and sustainable land-use systems.[74] Trees or shrubs are intentionally used within agricultural systems, or non-timber forest products are cultured in forest settings.[75]

Forest gardens

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Suburban forest garden in Sheffield, UK, with different layers of vegetation

Forest gardens or food forests are permaculture systems designed to mimic natural forests. Forest gardens incorporate processes and relationships that the designers understand to be valuable in natural ecosystems.[26][76][77] A mature forest ecosystem is organised into layers with constituents such as trees, understory, ground cover, soil, fungi, insects, and other animals. Because plants grow to different heights, a diverse community of organisms can occupy a relatively small space, each at a different layer.[78]

Suburban and urban permaculture

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South Central Farm was one of the largest urban gardens in the United States before its demolition in 2006.

The fundamental element of suburban and urban permaculture is the efficient utilization of space. Wildfire journal suggests using methods such as the keyhole garden which require little space.[80] Neighbors can collaborate to increase the scale of transformation, using sites such as recreation centers, neighborhood associations, city programs, faith groups, and schools. Columbia, an ecovillage in Portland, Oregon, consisting of 37 apartment condominiums, influenced its neighbors to implement permaculture principles, including in front-yard gardens.[81] Suburban permaculture sites such as one in Eugene, Oregon, include rainwater catchment, edible landscaping, removing paved driveways, turning a garage into living space, and changing a south side patio into passive solar.[82]

Vacant lot farms are community-managed farm sites, but are often seen by authorities as temporary rather than permanent.[83] For example, Los Angeles' South Central Farm (1994–2006), one of the largest urban gardens in the United States, was bulldozed with approval from property owner Ralph Horowitz, despite community protest.[84][85][86]

The possibilities and challenges for suburban or urban permaculture vary with the built environment around the world. For example, land is used more ecologically in Jaisalmer, India than in American planned cities such as Los Angeles:[83]

the application of universal rules regarding setbacks from roads and property lines systematically creates unused and purposeless space as an integral part of the built landscape, well beyond the classic image of the vacant lot. ... Because these spaces are created in accordance with a general pattern, rather than responding to any local need or desire, many if not most are underutilized, unproductive, and generally maintained as ecologically disastrous lawns by unenthusiastic owners. In this broadest understanding of wasted land, the concept is opened to reveal how our system of urban design gives rise to a ubiquitous pattern of land that, while not usually conceived as vacant, is in fact largely without ecological or social value.[83]

— Korsunsky (2019), "From vacant land to urban fallows: a permacultural approach to wasted land in cities and suburbs"

Marine systems

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Harvesting of seaweed in Jambiani, Tanzania

Permaculture derives its origin from agriculture, although the same principles, especially its foundational ethics, can also be applied to mariculture, particularly seaweed farming. In Marine Permaculture, artificial upwelling of cold, deep ocean water is induced.[87][88] When an attachment substrate is provided in association with such an upwelling, and kelp sporophytes are present, a kelp forest ecosystem can be established (since kelp needs the cool temperatures and abundant dissolved macronutrients present in such an environment).[89] Microalgae proliferate as well.[90][91] Marine forest habitat is beneficial for many fish species,[92] and the kelp is a renewable resource for food, animal feed,[93] medicines[94] and various other commercial products.[95][96] It is also a powerful tool for carbon fixation.[90][97][98]

The upwelling can be powered by renewable energy on location. Vertical mixing has been reduced due to ocean stratification effects associated with climate change.[99] Reduced vertical mixing and marine heatwaves have decimated seaweed ecosystems in many areas.[100][101][102] Marine permaculture mitigates this by restoring some vertical mixing and preserves these important ecosystems. By preserving and regenerating habitat offshore on a platform, marine permaculture employs natural processes to regenerate marine life.[88][103][104]

Grazing

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Conservation grazing: Longhorn Cattle managing the national nature reserve at Ruislip Lido

Grazing is blamed for much destruction. However, when grazing is modeled after nature, it can have the opposite effect.[105][106] Cell grazing is a system of grazing in which herds or flocks are regularly and systematically moved to fresh range with the intent to maximize forage quality and quantity. Sepp Holzer and Joel Salatin have shown how grazing can start ecological succession or prepare ground for planting. Allan Savory's holistic management technique has been likened to "a permaculture approach to rangeland management".[107][108] One variation is conservation grazing, where the primary purpose of the animals is to benefit the environment and the animals are not necessarily used for meat, milk or fiber.[109][110][111] Sheep can replace lawn mowers.[112][113] Goats and sheep can eat invasive plants.[114][115]

Natural building

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Further information: Sustainable architecture
Small cob building with a living roof

Natural building involves using a range of building systems and materials that apply permaculture principles. The focus is on durability and the use of minimally processed, plentiful, or renewable resources, as well as those that, while recycled or salvaged, produce healthy living environments and maintain indoor air quality. For example, cement, a common building material, emits carbon dioxide and is harmful to the environment while natural building works with the environment, using materials that are biodegradable, such as cob, adobe, rammed earth (unburnt clay), and straw bale (which insulates as well as modern synthetic materials).[116]

Issues

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Intellectual property

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Trademark and copyright disputes surround the word permaculture. Mollison's books claimed on the copyright page, "The contents of this book and the word PERMACULTURE are copyright." Eventually Mollison acknowledged that he was mistaken and that no copyright protection existed.[117]

In 2000, Mollison's U.S.-based Permaculture Institute sought a service mark for the word permaculture when used in educational services such as conducting classes, seminars, or workshops.[118] The service mark would have allowed Mollison and his two institutes to set enforceable guidelines regarding how permaculture could be taught and who could teach it, particularly with relation to the PDC, despite the fact that he had been certifying teachers since 1993. This attempt failed and was abandoned in 2001. Mollison's application for trademarks in Australia for the terms "Permaculture Design Course" and "Permaculture Design" was withdrawn in 2003. In 2009 he sought a trademark for "Permaculture: A Designers' Manual" and "Introduction to Permaculture", the names of two of his books. These applications were withdrawn in 2011. Australia has never authorized a trademark for the word permaculture.[119]

Methodology

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Further information: Scientific method

Permaculture has been criticised as being poorly defined and unscientific.[4] Critics have pushed for less reliance on anecdote and extrapolation from ecological first principles in favor of peer-reviewed research to substantiate productivity claims and to clarify methodology. Peter Harper from the Centre for Alternative Technology suggests that most of what passes for permaculture is irrelevant to real problems.[5] Harper notes that British organic farmers are "embarrassed or openly derisive" of permaculture, while the permaculture expert Robert Kourik found the supposed advantages of "less- or no-work gardening, bountiful yields, and the soft fuzzy glow of knowing that the garden will ... live on without you" were often illusory.[5] Harper found "many permacultures" are based on ideas ranging from practical farming techniques to "bullshit ... no more than charming cultural graces."[5]

Defenders respond that permaculture is not yet a mainstream scientific tradition and lacks the resources of mainstream industrial agriculture. Rafter Ferguson and Sarah Lovell point out that permaculturalists rarely engage with mainstream research in agroecology, agroforestry, or ecological engineering, and claim that mainstream science has an elitist or pro-corporate bias.[120][121][5] Julius Krebs and Sonja Bach argue in Sustainability that there is "scientific evidence for all twelve [of Holmgren's] principles".[122]

In 2017, Ferguson and Lovell presented sociological and demographic data from 36 self-described American permaculture farms. The farms were well diversified, with a median effective number of enterprises per farm of 3.6 (out of a maximum of 6 in the analysis method used). Business strategies included small mixed farms, integrated producers of perennial and animal crops, mixes of production and services, livestock, and service-based businesses. Median household income ($38,750) was less than either the national median household income ($51,017) or the national median farm household income ($68,680).[123]

A 2019 study by Hirschfeld and Van Acker found that adopting permaculture consistently encouraged the cultivation of perennials, crop diversity, landscape heterogeneity, and nature conservation. They discovered that grass-roots adopters were "remarkably consistent" in their implementation of permaculture, leading them to conclude that the movement could exert influence over positive agroecological transitions.[124]

In 2024, Reiff and colleagues stated that permaculture is a "sustainable alternative to conventional agriculture", and that it "strongly" enhances carbon stocks, soil quality, and biodiversity, making it "an effective tool to promote sustainable agriculture, ensure sustainable production patterns, combat climate change and halt and reverse land degradation and biodiversity loss." They point out that most of permaculture's commonest methods, such as agroforestry, polycultures, and water harvesting features, are backed by peer-reviewed research.[6]

See also

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References

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  1. ^ a b c Birnbaum Fox, Juliana (9 June 2010). "Indigenous Science". Cultural Survival Quarterly. 33 (1) – via Indiana University. Bill Mollison, often called the 'father of permaculture,' worked with indigenous people in his native Tasmania and worldwide, and credits them with inspiring his work. "I believe that unless we adopt sophisticated aboriginal belief systems and learn respect for all life, then we lose our own," he wrote in the seminal Permaculture: A Designers' Manual.
  2. ^ a b Holmgren, David (2007). "Essence of Permaculture" (PDF). Permaculture: Principles & Pathways Beyond Sustainability: 7. This focus in permaculture on learning from indigenous, tribal and cultures of place is based on the evidence that these cultures have existed in relative balance with their environment, and survived for longer than any of our more recent experiments in civilisation.
  3. ^ a b Schaeffer, John (2014). Real Goods Solar Living Sourcebook. New Society Publishers. p. 292. ISBN 9780865717848. Bill Mollison and a younger David Holmgren, who were studying the unstable and unsustainable characteristics of Western industrialized culture [...] They were drawn to indigenous worldviews...
  4. ^ a b "Permaculture for Sceptics". The Permaculture Research Institute. 11 March 2021. Archived from the original on 21 April 2021. Retrieved 22 July 2021.
  5. ^ a b c d e Peter Harper (2003). "A Critique of Permaculture: Cleaning out the stables" (PDF). Academia-danubiana.net. Retrieved 5 March 2022.
  6. ^ a b Reiff, Julius; Jungkunst, Hermann F.; Mauser, Ken M.; Kampel, Sophie; Regending, Sophie; Rösch, Verena; Zaller, Johann G.; Entling, Martin H. (4 July 2024). "Permaculture enhances carbon stocks, soil quality and biodiversity in Central Europe". Communications Earth & Environment. 5 (1): 305. Bibcode:2024ComEE...5..305R. doi:10.1038/s43247-024-01405-8. ISSN 2662-4435.
  7. ^ Castle, Sarah E.; Miller, Daniel C.; Merten, Nikolas; Ordonez, Pablo J.; Baylis, Kathy (17 March 2022). "Evidence for the impacts of agroforestry on ecosystem services and human well-being in high-income countries: a systematic map". Environmental Evidence. 11 (1): 10. Bibcode:2022EnvEv..11...10C. doi:10.1186/s13750-022-00260-4. ISSN 2047-2382. PMC 11378871. PMID 39294716.
  8. ^ Brooker, Rob W.; Bennett, Alison E.; Cong, Wen-Feng; Daniell, Tim J.; George, Timothy S.; Hallett, Paul D.; Hawes, Cathy; Iannetta, Pietro P. M.; Jones, Hamlyn G.; Karley, Alison J.; Li, Long; McKenzie, Blair M.; Pakeman, Robin J.; Paterson, Eric; Schöb, Christian (April 2015). "Improving intercropping: a synthesis of research in agronomy, plant physiology and ecology". New Phytologist. 206 (1): 107–117. doi:10.1111/nph.13132. ISSN 0028-646X. PMID 25866856.
  9. ^ Chen, Tong; Wang, Mo; Su, Jin; Li, Jianjun (January 2023). "Unlocking the Positive Impact of Bio-Swales on Hydrology, Water Quality, and Biodiversity: A Bibliometric Review". Sustainability. 15 (10): 8141. doi:10.3390/su15108141. ISSN 2071-1050.
  10. ^ King 1911, p. Title page.
  11. ^ Smith, Joseph Russell; Smith, John (1987). Tree Crops: A permanent agriculture. Island Press. ISBN 978-1-59726873-8.
  12. ^ Hart 1996, p. 41.
  13. ^ "Biodiversity Heritage Library" How to build up and maintain the virgin fertility of our soils, Holding institute: U.S. Department of Agriculture, National Agricultural Library; Sponsor: U.S. Department of Agriculture, National Agricultural Library; Date Scanned: 08/10/2016. Retrieved 2022-08-19
  14. ^ "Henry Ford Collections and Research" How to Build Up and Maintain the Virgin Fertility of Our Soils, October 1936. Retrieved 2022-08-19
  15. ^ "National Agricultural Library, George Washington Carver: A national agricultural digital exhibit" About George Washington Carver, scans of multiple publications by Carver. Retrieved 2022-08-19.
  16. ^ Holmgren, David (2006). "The Essence of Permaculture". Holmgren Design Services. Archived from the original on 26 May 2008. Retrieved 10 September 2011.
  17. ^ Mollison, Bill (15–21 September 1978). "The One-Straw Revolution by Masanobu Fukuoka". Nation Review. p. 18.
  18. ^ a b Introduction to Permaculture, 1991, Mollison, p.v
  19. ^ Permaculture One. Transworld Publishers. 1978. p. 128. ISBN 978-0552980753.
  20. ^ Mollison, B. C. (1991). Introduction to permaculture. Slay, Reny Mia., Jeeves, Andrew. Tyalgum, Australia: Tagari Publications. ISBN 0-908228-05-8. OCLC 24484204.
  21. ^ Lillington, Ian; Holmgren, David; Francis, Robyn; Rosenfeldt, Robyn. "The Permaculture Story: From 'Rugged Individuals' to a Million Member Movement" (PDF). Pip Magazine. Retrieved 9 July 2015.
  22. ^ Massicotte, Marie-Josée; Kelly-Bisson, Christopher (1 September 2019). "What's wrong with permaculture design courses? Brazilian lessons for agroecological movement-building in Canada". Agriculture and Human Values. 36 (3): 581–594. doi:10.1007/s10460-018-9870-8. ISSN 1572-8366. S2CID 158253671.
  23. ^ a b c d Mollison 1988, p. 2.
  24. ^ a b Holmgren, David (2002). Permaculture: Principles & Pathways Beyond Sustainability. Holmgren Design Services. p. 1. ISBN 978-0-646-41844-5.
  25. ^ Rhodes, Christopher J. (2015). "Permaculture: regenerative - not merely sustainable". Science Progress. 98 (4): 405. doi:10.3184/003685015X14467291596242. PMC 10365330. PMID 26790178. S2CID 31694833.
  26. ^ a b "Edible Forest Gardening". Archived from the original on 1 November 2011. Retrieved 5 April 2012.
  27. ^ Ferguson, Rafter Sass; Lovell, Sarah Taylor (1 April 2014). "Permaculture for agroecology: design, movement, practice, and worldview. A review". Agronomy for Sustainable Development. 34 (2): 251–274. Bibcode:2014AgSD...34..251F. doi:10.1007/s13593-013-0181-6. ISSN 1773-0155. S2CID 15089504.
  28. ^ Veteto, James R.; Lockyear, Joshua (2008). "Environmental Anthropology Engaging Permaculture: Moving Theory and Practice Toward Sustainability". Culture & Agriculture. 30 (1–2): 50–53. doi:10.1111/j.1556-486X.2008.00007.x – via AnthroSource.
  29. ^ Holmgren, David (1997). "Weeds or Wild Nature" (PDF). Permaculture International Journal. Retrieved 10 September 2011.
  30. ^ a b Mollison, Bill. "A quote from Permaculture". www.goodreads.com. Retrieved 27 December 2022.
  31. ^ a b c d e f g h i j k l m "Permaculture: Principles and Pathways Beyond Sustainability". Holmgren Design. Retrieved 21 October 2013.
  32. ^ Simberloff, D.; Dayan, T. (1991). "The Guild Concept and the Structure of Ecological Communities". Annual Review of Ecology and Systematics. 22: 115. doi:10.1146/annurev.es.22.110191.000555.
  33. ^ Williams, S.E.; Hero, J.M. (1998). "Rainforest frogs of the Australian Wet Tropics: guild classification and the ecological similarity of declining species". Proceedings: Biological Sciences. 265 (1396): 597–602. doi:10.1098/rspb.1998.0336. PMC 1689015. PMID 9881468.
  34. ^ a b c d e f Bloom, Jessi; Boehnlein, Dave (2015). Practical Permaculture: For Home Landscapes, Your Community, and the Whole Earth. Timber Press. pp. 223–24, 232–33. ISBN 9781604694437.
  35. ^ a b c d e f g Burnett 2001, p. 26.
  36. ^ "Permacultuur course". Netherlands: WUR.
  37. ^ a b Hemenway 2009, pp. 45–47, 286.
  38. ^ "10. Edge Effect". Deep Green Permaculture. 3 April 2013. Retrieved 19 January 2017.
  39. ^ Wheaton, Paul. "Raised garden beds: hugelkultur instead of irrigation" Richsoil. Retrieved 15 July 2012.
  40. ^ Hemenway 2009, pp. 84–85.
  41. ^ Feineigle, Mark. "Hugelkultur: Composting Whole Trees With Ease" Archived 28 September 2015 at the Wayback Machine. Permaculture Research Institute of Australia. Retrieved 15 July 2012.
  42. ^ Gordon Glore, Angela (2014). "A worldwide tour of (almost) permaculture". Journal of Agriculture, Food Systems, and Community Development. 5: 151.
  43. ^ Laffoon, Megan; Meier, Albert; Groves, Chris (2015). "Potential Application of Hugelkultur to Increase Water Holding Capacity of Karst Rocky Desertified Lands". National Cave and Karst Management Symposium. 21: 9–11.
  44. ^ a b "Sheet Mulching: Greater Plant and Soil Health for Less Work". Agroforestry. 3 September 2011. Archived from the original on 10 December 2002. Retrieved 21 October 2011.
  45. ^ Toensmeier, Eric (24 November 2022). "Sheet Mulching in 9 Easy Steps". Permaculture.co.uk. Retrieved 18 October 2023.
  46. ^ Stratton, Margie Lynn; Barker, Allen; Ragsdale, James (April 2000). "Sheet composting overpowers weeds in restoration project". BioCycle. 41 (4): 57.
  47. ^ Faulkner, Edward (1943). Plowman's Folly. University of Oklahoma Press. OCLC 563317.
  48. ^ King, F. C. (1946). Is Digging Necessary?. New Times.
  49. ^ Guest, A. (1948). Gardening without Digging. Wigfield.
  50. ^ "Resource: The One-Straw Revolution: An Introduction to Natural Farming". oceanofpdf.com. Retrieved 30 July 2023.
  51. ^ "Michael Rothman, Building Fertile Soil". www.motherearthnews.com. Retrieved 30 July 2023.
  52. ^ "Preston Sullivan, NCAT Agriculture Specialist, Sustainable Soil Management". Archived from the original on 5 March 2009. Retrieved 10 March 2009.
  53. ^ Engels, Jonathon (18 November 2016). "How and Why to Rotate Your Annual Crops". Permaculture Research Institute. Retrieved 18 October 2023.
  54. ^ Ludwig-Cooper, Stephanie (2 December 2011). "Companion Planting Information and Chart". Permaculture News. Retrieved 18 October 2023.
  55. ^ McClure, Susan (1995). "Companion Planting Made Easy" (PDF). Hpfb.org. pp. 4–6. Archived from the original (PDF) on 9 February 2022. Retrieved 9 February 2022. excerpted from McClure, Susan (1994). Companion Planting. Rodale Press. ISBN 978-0-87596-616-8.
  56. ^ "Rainwater harvesting". Germany: Aramo. 2012. Archived from the original on 6 June 2013. Retrieved 19 August 2015.
  57. ^ "Rainwater harvesting: regulatory position statement". GOV.UK. Retrieved 27 December 2022.
  58. ^ "Stormwater harvesting | Melbourne Water". www.melbournewater.com.au. Retrieved 27 December 2022.
  59. ^ "Greywater Recycling". TheGreenAge. 14 April 2013. Retrieved 27 December 2022.
  60. ^ Yeomas, P.A (1954). The Keyline plan. Australia: Authour. p. 120.
  61. ^ Tipping, Don (4 January 2013). "Creating Permaculture Keyline Water Systems" (video). UK: Beaver State Permaculture.
  62. ^ Beyers, R; MacLean, S. "Developing an educational curriculum for organic farming and permaculture in theDistrict of Santa Fe" (PDF). La Foundación Héctor Gallego: 16. All the permaculture farms we visited had large, fully-functioning vermicompost which produced fertilizer that was naturally rich in nutrients and acid that was used as a substance for fumigation instead of synthetic based substances.
  63. ^ a b Reza, Shamim (24 March 2016). "Vermicomposting – A Great Way to Turn the Burdens into Resources". Permaculture Research Institute.
  64. ^ de la Vega, Anna (2016). "Vermicomposting: The Future of Sustainable Agriculture and Organic Waste Management" (PDF). Winston Churchill Report: 29–31.
  65. ^ Tilley, E.; Ulrich, L.; Lüthi, C.; Reymond, Ph.; Zurbrügg, C. (2014). Compendium of Sanitation Systems and Technologies (2nd Revised ed.). Duebendorf, Switzerland: Swiss Federal Institute of Aquatic Science and Technology (Eawag). p. 10. ISBN 978-3-906484-57-0.
  66. ^ Engels, Jonathon (17 April 2015). "The Magic and Mystery of Constructing a Herb Spiral and Why Every Suburban Lawn Should Have One". Permaculture News. Permaculture Research Institute. Retrieved 9 September 2023.
  67. ^ "Advantages of an Herb Spiral". The Herb Exchange. The Growers Exchange. 12 July 2018. Retrieved 9 September 2023.
  68. ^ Mollison 1988, p. 5: 'Deer, rabbits, sheep, and herbivorous fish are very useful to us, in that they convert unusable herbage to acceptable human food. Animals represent a valid method of storing inedible vegetation as food.'
  69. ^ a b "Backyard Animals". Permaculture.org. Archived from the original on 17 December 2014. Retrieved 6 April 2017.
  70. ^ "Permaculture Animals as a Discipline to the System". The Permaculture Research Institute. 7 March 2016. Retrieved 6 April 2017.
  71. ^ a b Masanobu, Fukuoka (1987) [1985], The Natural Way of Farming – The Theory and Practice of Green Philosophy (rev ed.), Tokyo: Japan Publications, p. 204
  72. ^ Fukuoka 1978, pp. 13, 15–18, 46, 58–60.
  73. ^ "Masanobu Fukuoka", Public Service (biography), Philippines: The Ramon Magsaysay Award Foundation, 1988, archived from the original on 15 January 2009, retrieved 27 November 2013.
  74. ^ "USDA National Agroforestry Center (NAC)". UNL. 1 August 2011. Archived from the original on 12 August 2012. Retrieved 21 October 2011.
  75. ^ "USDA Agroforestry Strategic Framework" (PDF). United States Department of Agriculture. 1 August 2011. Retrieved 19 January 2017.
  76. ^ "Graham Bell's Forest Garden". Permaculture. Media mice. Archived from the original on 8 March 2012.
  77. ^ "Establishing a Food Forest" (film review). Transition culture. 11 February 2009.
  78. ^ a b c d e f g h "Nine layers of the edible forest garden". TC permaculture. 27 May 2013..
  79. ^ "Seven layers of a forest", Food forests, CA: Permaculture school, archived from the original on 19 May 2015, retrieved 5 May 2014.
  80. ^ Wildfire. Vol. 6. University of Virginia. 1992. p. 22.
  81. ^ Spencer, Jan (Winter 2017). "Green and Resilient Neighborhoods: Portland, Oregon and Beyond". Communities. 177: 49–54 – via ProQuest.
  82. ^ "Suburban Permaculture". Suburban Permaculture. Retrieved 12 January 2021.
  83. ^ a b c Korsunsky, Alex (2019). "From vacant land to urban fallows: a permacultural approach to wasted land in cities and suburbs". Journal of Political Ecology. 26: 293–294. doi:10.2458/v26i1.22949. S2CID 199175607.
  84. ^ Kuipers, Dean (23 April 2020). "Digging the Dirt on an L.A. Farm". Alta Online.
  85. ^ Ngo, Audrey (20 August 2018). "Hope Grows at the Once 'Magical' Site Of LA's South Central Farm". LAist. Archived from the original on 20 August 2018.
  86. ^ Alpert Reyes, Emily (2 July 2019). "Latest battle over South Central Farm ends – this time not with arrests, but a vote". Los Angeles Times.
  87. ^ "Climate Foundation: Marine Permaculture". Climate Foundation. Retrieved 29 July 2020.
  88. ^ a b "Santa Barbara Permaculture Network - local to global, an educational non-profit since 2000 - Events". Sbpermaculture.org. Retrieved 29 July 2020.
  89. ^ Hollarsmith, Jordan A.; Buschmann, Alejandro H.; Camus, Carolina; Grosholz, Edwin D. (1 January 2020). "Varying reproductive success under ocean warming and acidification across giant kelp (Macrocystis pyrifera) populations". Journal of Experimental Marine Biology and Ecology. 522: 151247. Bibcode:2020JEMBE.52251247H. doi:10.1016/j.jembe.2019.151247. ISSN 0022-0981. S2CID 208555472.
  90. ^ a b Flannery, Tim (2017). Sunlight and Seaweed: An Argument for How to Feed, Power and Clean Up the World. Melbourne, Victoria: Text Publishing House Melbourne. ISBN 9781925498684.
  91. ^ Jiang, Zhibing; Liu, Jingjing; Li, Shanglu; et al. (10 March 2020). "Kelp cultivation effectively improves water quality and regulates phytoplankton community in a turbid, highly eutrophic bay". Science of the Total Environment. 707: 135561. Bibcode:2020ScTEn.70735561J. doi:10.1016/j.scitotenv.2019.135561. ISSN 0048-9697. PMID 31972904. S2CID 209725048.
  92. ^ Wernberg, Thomas; Krumhansl, Kira; Filbee-Dexter, Karen; Pedersen, Morten F. (1 January 2019), "Status and Trends for the World's Kelp Forests", in Sheppard, Charles (ed.), World Seas: an Environmental Evaluation (Second Edition), Academic Press, pp. 57–78, doi:10.1016/b978-0-12-805052-1.00003-6, ISBN 978-0-12-805052-1, S2CID 134294676, retrieved 29 July 2020
  93. ^ Belanche, Alejandro; Jones, Eleanor; Parveen, Ifat; Newbold, Charles J. (2016). "A Metagenomics Approach to Evaluate the Impact of Dietary Supplementation with Ascophyllum nodosum or Laminaria digitata on Rumen Function in Rusitec Fermenters". Frontiers in Microbiology. 7: 299. doi:10.3389/fmicb.2016.00299. ISSN 1664-302X. PMC 4785176. PMID 27014222.
  94. ^ Girão, Mariana; Ribeiro, Inês; Ribeiro, Tiago; et al. (2019). "Actinobacteria Isolated From Laminaria ochroleuca: A Source of New Bioactive Compounds". Frontiers in Microbiology. 10: 683. doi:10.3389/fmicb.2019.00683. ISSN 1664-302X. PMC 6465344. PMID 31024480.
  95. ^ Laurens, Lieve M. L.; Lane, Madeline; Nelson, Robert S. (6 May 2020). "Sustainable Seaweed Biotechnology Solutions for Carbon Capture, Composition, and Deconstruction". Trends in Biotechnology. 38 (11): 1232–1244. doi:10.1016/j.tibtech.2020.03.015. ISSN 0167-7799. PMID 32386971.
  96. ^ Buschmann, Alejandro H.; Prescott, Steven; Potin, Philippe; et al. (1 January 2014), Bourgougnon, Nathalie (ed.), "Chapter Six - The Status of Kelp Exploitation and Marine Agronomy, with Emphasis on Macrocystis pyrifera, in Chile", Advances in Botanical Research, Sea Plants, vol. 71, Academic Press, pp. 161–188, doi:10.1016/b978-0-12-408062-1.00006-8, hdl:10533/128618, retrieved 29 July 2020
  97. ^ Flannery, Tim (23 September 2019), Can seaweed help curb global warming?, retrieved 29 July 2020
  98. ^ Krause-Jensen, Dorte; Lavery, Paul; Serrano, Oscar; et al. (30 June 2018). "Sequestration of macroalgal carbon: the elephant in the Blue Carbon room". Biology Letters. 14 (6): 20180236. doi:10.1098/rsbl.2018.0236. PMC 6030603. PMID 29925564.
  99. ^ Barton, E. D.; Field, D. B.; Roy, C. (1 September 2013). "Canary current upwelling: More or less?". Progress in Oceanography. 116: 167–178. Bibcode:2013PrOce.116..167B. doi:10.1016/j.pocean.2013.07.007. hdl:10261/80552. ISSN 0079-6611.
  100. ^ Thomsen, Mads S.; Mondardini, Luca; Alestra, Tommaso; et al. (2019). "Local Extinction of Bull Kelp (Durvillaea spp.) Due to a Marine Heatwave". Frontiers in Marine Science. 6. doi:10.3389/fmars.2019.00084. ISSN 2296-7745. S2CID 69173935.
  101. ^ Straub, Sandra C.; Wernberg, Thomas; Thomsen, Mads S.; et al. (2019). "Resistance, Extinction, and Everything in Between – The Diverse Responses of Seaweeds to Marine Heatwaves". Frontiers in Marine Science. 6. doi:10.3389/fmars.2019.00763. hdl:2160/465c66d5-e36f-4392-b45d-e76611368800. ISSN 2296-7745. S2CID 209324664.
  102. ^ Wernberg, T.; Bennett, S.; Babcock, R. C.; et al. (8 July 2016). "Climate-driven regime shift of a temperate marine ecosystem". Science. 353 (6295): 169–172. Bibcode:2016Sci...353..169W. doi:10.1126/science.aad8745. hdl:20.500.11937/31133. ISSN 0036-8075. PMID 27387951. S2CID 206645399.
  103. ^ Archived at Ghostarchive and the Wayback Machine: Powers, Matt (10 July 2019). "Marine Permaculture with Brian Von Herzen Episode 113 A Regenerative Future". Youtube.
  104. ^ Archived at Ghostarchive and the Wayback Machine: Gamble, Morag (3 December 2019). "Marine Permaculture with Dr Brian von Herzen & Morag Gamble". Youtube.
  105. ^ "Prince Charles sends a message to IUCN's World Conservation Congress". International Union for Conservation of Nature. 26 August 2012. Archived from the original on 15 March 2013. Retrieved 6 April 2013.
  106. ^ Undersander, Dan; et al. "Grassland birds: Fostering habitat using rotational grazing" (PDF). University of Wisconsin-Extension. Retrieved 5 April 2013.
  107. ^ Fairlie, Simon (2010). Meat: A Benign Extravagance. Chelsea Green. pp. 191–93. ISBN 978-1-60358325-1.
  108. ^ Bradley, Kirsten (26 April 2010). "Holistic Management: Herbivores, Hats, and Hope". Milkwood. Retrieved 25 March 2014.
  109. ^ Ash, Andrew (2002), The Ecograze Project – developing guidelines to better manage grazing country (PDF), et al., CSIRO, ISBN 978-0-9579842-0-2, archived from the original (PDF) on 10 April 2012, retrieved 7 April 2013
  110. ^ McCarthy, Caroline. "Things to make you happy: Google employs goats". CNET. Retrieved 7 April 2013.
  111. ^ Gordon, Ian. "A systems approach to livestock/resource interactions in tropical pasture systems" (PDF). The James Hutton Institute. Archived from the original (PDF) on 3 February 2014. Retrieved 7 April 2013.
  112. ^ "Munching sheep replace lawn mowers in Paris". The Straits Times. 4 April 2013. Retrieved 7 April 2013.
  113. ^ Klynstra, Elizabeth. "Hungry sheep invade Candler Park". CBS Atlanta. Archived from the original on 3 February 2014. Retrieved 7 April 2013.
  114. ^ Littman, Margaret (26 July 2011). "Getting your goat: Eco-friendly mowers". Chicago Tribune News. Archived from the original on 12 May 2013. Retrieved 7 April 2013.
  115. ^ Stevens, Alexis. "Kudzu-eating sheep take a bite out of weeds". The Atlanta Journal-Constitution. Retrieved 8 June 2021.
  116. ^ Quiquivix, Linda (2017). "Beyond Permaculture Ethics: Review of Permaculture Magazine's Film Series, "Living with the Land"". Capitalism Nature Socialism. 28 (3): 130. doi:10.1080/10455752.2017.1353229. S2CID 148659771 – via Taylor & Francis.
  117. ^ Grayson, Russ (2011). "The Permaculture Papers 5: time of change and challenge - 2000–2004". Pacific edge. Retrieved 8 September 2011.
  118. ^ United States Patent and Trademark Office (2011). "Trademark Electronic Search System (TESS)". U.S. Department of Commerce. Archived from the original on 16 March 2017. Retrieved 8 September 2011.
  119. ^ "Result". IP Australia. 2011. Archived from the original on 14 May 2015. Retrieved 8 September 2011.
  120. ^ Ferguson and Lovell 2013
  121. ^ Robert Scott. "A Critical Review of Permaculture in the United States" (PDF). Robscott.net. Retrieved 5 March 2022.
  122. ^ Krebs, Julius; Bach, Sonja (2018). "Permaculture—Scientific evidence of principles for the agroecological design of farming systems". Sustainability. 10 (9): 3218. doi:10.3390/su10093218.
  123. ^ Ferguson, Rafter Sass; Lovell, Sarah Taylor (2 May 2017). "Livelihoods and production diversity on U.S. permaculture farms" (PDF). Agroecology and Sustainable Food Systems. 41 (6). Informa UK: 588–613. Bibcode:2017AgSFS..41..588F. doi:10.1080/21683565.2017.1320349. ISSN 2168-3565. S2CID 157437298.
  124. ^ Hirschfeld, Sarah; Acker, Rene Van (June 2020). "Permaculture farmers consistently cultivate perennials, crop diversity, landscape heterogeneity and nature conservation". Renewable Agriculture and Food Systems. 35 (3): 342–351. doi:10.1017/S1742170519000012. ISSN 1742-1705.

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