Forestry & Forest Sciences · Foundations · also Principles of Forestry, Introduction to Forestry and Natural Resources, FOR 101
What forestry is, how the profession grew from timber management to multiple-use and sustainable forest management, the extent and change of the world's forests, and the roles of forests in economies and livelihoods.
In the exams: ICAR AIEEA-PG Group 09 Unit I and forest-importance topics; ICAR AICE-JRF 59 Unit 1 (extent and role of forests); background to every forest service exam
Forestry is the science, art and practice of managing forests, tree plantations and related natural resources to meet human needs and goals while sustaining the ecosystems that provide them. It began as the craft of keeping a steady supply of timber and fuel from royal and state forests, and has grown into a profession that manages forests for wood and non-wood products, water, soil, biodiversity, carbon, recreation, cultural values and the livelihoods of the many people who live in and around forests. Foresters work in government services, companies, community organisations, research institutes, conservation bodies, certification and carbon markets on every continent.
This manual introduces the field. It begins with the definitions of forest, other wooded land and forestry used in international reporting by the Food and Agriculture Organization of the United Nations (FAO), and traces the history of scientific forestry from its German and French roots and its spread through colonial forest services, including the British-Indian service, to forestry in the Americas, Africa and Asia. It then describes the extent, distribution and change of the world's forests from the FAO Global Forest Resources Assessments, the productive, protective and ameliorative roles of forests, and their place in national economies and in rural and indigenous livelihoods. The central management ideas, sustained yield, multiple use and sustainable forest management, are followed by forest ownership and tenure, the branches of forestry and the forester's professional roles, the drivers and trends of deforestation and forest degradation, and the international forest institutions.
Each of these topics is developed further in later subjects of this track: silviculture, mensuration, management, policy and law, community forestry, forest ecology and forests and climate. Here the aim is the overview every forester needs from the first week of study and keeps returning to.
Entrance tests for forestry degrees, postgraduate entrance and doctoral fellowship examinations in forestry, civil-service forest examinations for officer and ranger posts in many countries, foresters' licensure examinations and professional certification all ask about this material: the FAO forest definition thresholds, headline figures of forest area and change, the founders and milestones of scientific forestry, the meaning of sustained yield and sustainable forest management, tenure categories, the main drivers of deforestation, and the mandates of FAO, UNFF, IUFRO and ITTO.
Definitions matter because forest statistics, laws, carbon accounting and certification all depend on them, and because the same piece of land can be counted as forest under one definition and not under another. The definitions used in FAO's Global Forest Resources Assessment (FRA), which most countries apply in international reporting, are the common reference. Forest is land spanning more than 0.5 hectares with trees higher than 5 metres and a canopy cover of more than 10 percent, or trees able to reach these thresholds in situ. It does not include land that is predominantly under agricultural or urban land use. Three points in this definition are often misunderstood. First, it is a land-use as well as a land-cover definition: an area temporarily without trees after harvest or fire remains forest if it is expected to regenerate, because its use has not changed. Second, young stands and plantations that have not yet reached 5 metres or 10 percent cover count as forest if they are able to reach these thresholds. Third, tree crops on agricultural land are excluded: fruit orchards, oil palm plantations, olive groves and agroforestry systems where crops are grown under tree cover are not forest in FRA terms, whereas rubber-wood plantations and stands of bamboo and palms that meet the thresholds and are not under agricultural use are included. Other wooded land is land not classified as forest, spanning more than 0.5 hectares, with trees higher than 5 metres and a canopy cover of 5 to 10 percent, or trees able to reach these thresholds, or with a combined cover of shrubs, bushes and trees above 10 percent. Other land with tree cover covers trees outside forests, such as orchards, agroforestry and urban trees. Many countries use national definitions with different thresholds, such as 20 or 30 percent canopy cover or 1 hectare minimum area, and under the climate convention each country chooses thresholds within ranges for its own reporting, so comparisons between sources must check definitions first.
Forestry has been defined in many ways; a common modern definition is the science, art and practice of managing forests and associated resources for human benefit in a sustainable manner. Silviculture, the art and science of establishing and tending forest stands, is its technical core, and the word forest itself comes from the medieval Latin foresta, which referred to land placed under special royal law, usually for hunting, rather than land covered in trees. This legal origin survives in the idea of forest land as a category of land designated by law for forest use, which may contain large treeless areas such as grasslands, wetlands, rock or water bodies, while some tree-covered land lies outside it. Recorded forest area in national statistics often means this legal or administrative category rather than tree cover measured by satellite, which explains much of the disagreement between official figures and global tree-cover maps. Other FRA terms used throughout this track include naturally regenerating forest, composed predominantly of trees established through natural regeneration; planted forest, composed predominantly of trees established by planting or deliberate seeding; plantation forest, a planted forest that is intensively managed and composed of one or two species, even-aged and regularly spaced, at planting and maturity; and primary forest, a naturally regenerated forest of native species where there are no clearly visible indications of human activities and the ecological processes are not significantly disturbed. Deforestation in FRA terms is the conversion of forest to other land use, whether human-induced or not, and does not include harvesting where the forest is expected to regenerate. Afforestation establishes forest on land not previously classified as forest; reforestation re-establishes forest on land classified as forest. Forest degradation has no single agreed definition; it generally means a reduction in the capacity of a forest to provide goods and services, and is measured in different ways by different bodies.
Laws to protect forests are ancient, but scientific forestry, the systematic measurement and planning of forests to secure continuous yields, began in early modern Europe as wood shortages threatened mining, smelting, shipbuilding and fuel supplies. In France, the Forest Ordinance of 1669 issued under the minister Colbert reorganised the administration of royal forests to secure timber for the navy, regulating cutting and requiring reserve trees, and its long rotations produced the oak high forests still managed in France today. In the German states, Hans Carl von Carlowitz, a mining administrator in Saxony, published Sylvicultura oeconomica in 1713, arguing that forests should be used in a continuous, steady and sustaining way; his term nachhaltende Nutzung is the origin of the German word Nachhaltigkeit, sustainability. Around 1800 German foresters built the techniques that defined the discipline: forest inventory and volume tables, yield tables, rotation planning, regulation of the annual cut by area and by volume, and the reafforestation of degraded land with conifers such as Norway spruce and Scots pine. Georg Ludwig Hartig and Heinrich Cotta founded forestry schools, Cotta's at Tharandt in Saxony becoming a state academy in 1816, and the concept of the normal forest, a forest with a complete and evenly distributed series of age classes producing an equal yield every year, became the ideal of management planning. In 1849 Martin Faustmann published the formula for the value of bare forest land under an infinite series of rotations, still the basis of forest economics. In the later nineteenth century, Karl Gayer criticised pure even-aged conifer plantations and advocated mixed, naturally regenerated stands, and in the 1920s Alfred Möller's continuous-cover forest (Dauerwald) idea extended this; such ideas have returned in close-to-nature forestry in Europe. The French national forestry school at Nancy, founded in 1824, trained foresters who spread these methods to other countries.
In the nineteenth century scientific forestry spread worldwide, mostly through colonial forest services that adopted German methods. The British-Indian tradition is the most influential example. Early teak plantations were established in the Malabar region in the 1840s. Dietrich Brandis, a German botanist, organised the management of the teak forests of Burma in the 1850s and in 1864 became the first Inspector General of Forests in British India, where he set up a forest department, systems of reserved and protected forests, working plans and forest legislation from the 1860s and 1870s. A forest school was founded at Dehra Dun in 1878, and a research institute there in 1906; British officers for the service were trained in Germany and France, then at Coopers Hill and later at Oxford. The model of a state forest department with reserved forests, working plans and a cadre of trained officers was carried to Burma, Malaya, East and West Africa, Cyprus and elsewhere, and similar state services were built by the French, Dutch and other colonial administrations, for example in Java and in French West Africa. The legacy is double-edged: these services developed silviculture of tropical species, long-term records and research institutions still in use, but they also enclosed customary lands, restricted the rights of forest-dwelling and shifting-cultivating peoples and favoured commercial timber, conflicts whose consequences shape community forestry and tenure reform today. Brandis also influenced North American forestry: he advised Gifford Pinchot, who became the first chief of the United States Forest Service in 1905 and promoted the utilitarian goal of the greatest good for the greatest number in the long run, and Carl Schenck, who founded the Biltmore Forest School in 1898. Forestry schools spread through the twentieth century to Latin America, Africa and Asia, and national traditions developed their own emphases, such as plantation forestry in the Southern Hemisphere, community forestry in South Asia and Mexico, and wilderness and ecosystem management in North America.
FAO has assessed the world's forests at intervals since 1946, and the Global Forest Resources Assessment has been published every five years since 1990. FRA is compiled from country reports prepared by national correspondents using common definitions, supplemented since 2010 by a global remote-sensing survey that samples satellite imagery to give independent estimates of land-use change. Country reports depend on national forest inventories of very different age and quality, so FRA figures carry uncertainty and are revised between assessments as countries improve their data; each new FRA recalculates the whole series back to 1990, and figures from different editions should not be mixed. According to FRA 2020, the world had about 4.06 billion hectares of forest, 31 percent of the total land area, or about 0.5 hectares per person. The distribution is very uneven: more than half of the world's forest is in five countries, the Russian Federation, Brazil, Canada, the United States and China, and about two-thirds is in ten countries. By climatic domain, the tropical domain holds the largest share, about 45 percent, followed by the boreal (about 27 percent), temperate (about 16 percent) and subtropical (about 11 percent) domains. About 93 percent of forest area is naturally regenerating and 7 percent planted; plantation forests, the intensively managed part of planted forest, cover about 3 percent, with the largest shares in South America and the lowest in Europe, where planted forests are mostly not classed as plantations. Primary forests cover more than 1 billion hectares, about a third of which are in Brazil, Canada and the Russian Federation together. Roughly 18 percent of forest area lies within legally established protected areas. A newer assessment, FRA 2025, has updated these figures; students should use the latest edition and the same edition throughout any comparison, and expect small revisions.
Forest change has two sides: gross loss through deforestation and gross gain through afforestation and natural expansion, and their difference is net change. FRA 2020 estimated that deforestation fell from about 16 million hectares per year in the 1990s to about 10 million hectares per year in 2015–2020. Net forest loss declined from about 7.8 million hectares per year in 1990–2000 to 5.2 million in 2000–2010 and 4.7 million in 2010–2020, because deforestation slowed in some regions and forest expansion continued in others; over the three decades the world lost a net area of about 178 million hectares. Regionally, in 2010–2020 Africa had the highest annual rate of net loss (about 3.9 million hectares per year), followed by South America (about 2.6 million), while Asia had the largest net gain, followed by Oceania and Europe; forest area in North and Central America changed little. Net change hides important detail. A region can show stable forest area while losing old natural forest and gaining young plantations, which differ greatly in carbon, biodiversity and services. Gross tree-cover loss estimated from satellite data, which includes harvest and natural disturbance, is much larger than deforestation in the FRA land-use sense, and must not be confused with it. Natural disturbances are increasing in some biomes: large fires in boreal, temperate and tropical forests, insect outbreaks such as bark beetles in conifer forests, drought mortality and storms. Forest expansion includes deliberate afforestation for wood, erosion control and carbon, and natural regrowth on abandoned farmland, which has expanded forest area in parts of Europe, North America and East Asia. Monitoring these changes requires both national inventories and remote sensing, which are developed in the inventory and remote sensing subjects of this track.
Classical forestry texts group the functions of forests into productive, protective and ameliorative (or bioaesthetic and regulatory) roles, a classification still used in many syllabi and closely matched by the ecosystem-service categories of provisioning, regulating, supporting and cultural services. The productive role is the supply of goods. Wood is the most visible: industrial roundwood for sawnwood, plywood, panels, pulp and paper and poles, and wood fuel as firewood and charcoal. Global wood removals are of the order of 4 billion cubic metres a year, and about half of this is wood fuel, which dominates removals in Africa and parts of Asia, while industrial roundwood dominates in North America, Europe and the plantation economies of the Southern Hemisphere. Non-wood forest products (NWFPs, also called non-timber forest products) include foods such as nuts, fruits, mushrooms, honey, bushmeat and leaves; fodder and grazing; medicinal plants; resins, gums, latex and tannins; fibres such as rattan and bamboo; and materials for crafts and construction. Their value is often greater than that of timber for rural households, though it is poorly captured in national statistics because much is consumed or traded informally. Forests are also sources of genetic resources for breeding and of compounds for pharmaceuticals. Wood is a renewable material with a lower embodied energy than steel, concrete or aluminium in many uses, and engineered wood products have extended its use in multi-storey construction, a substitution benefit counted in climate strategies. Plantation forests, though a small share of forest area, supply a large and growing share of industrial roundwood because their growth rates are much higher than those of natural forests, and they can reduce harvesting pressure on natural forests when well located. Productive use must be balanced with other roles, which is the core task of forest management.
The protective role covers the defence of soil, water and infrastructure. Forest canopies, litter and roots intercept rainfall, increase infiltration and bind soil, so forested catchments generally yield cleaner water with lower sediment loads and more stable dry-season baseflow than degraded land, although forests also use more water than shorter vegetation, so planting trees can reduce total water yield in some catchments; the relation between forests and water depends on climate, species and soil. Protection forests on steep slopes guard against landslides, rockfall and avalanches in mountain regions and are managed specifically for this purpose in the Alps and other ranges. Mangroves and coastal forests reduce the force of waves and storm surges and trap sediment; shelterbelts and windbreaks protect crops, livestock and soil from wind erosion in drylands and plains, and sand-dune fixation by planting has stabilised coasts and deserts on several continents. The ameliorative role refers to the moderation of environmental conditions. Forests moderate local microclimate, reducing temperature extremes, raising humidity and providing shade; at landscape and regional scale, transpiration from large forests recycles moisture to the atmosphere and contributes to rainfall downwind, as shown for the Amazon and Congo basins. Forests store large amounts of carbon in biomass, dead wood, litter and soil, and absorb carbon dioxide as they grow, so they are central to climate mitigation; deforestation and degradation release this carbon. They provide habitat for most of the world's terrestrial species, support pollinators and natural pest control, and filter air pollutants. Urban trees cool cities and reduce stormwater runoff. Finally, forests have aesthetic, recreational, spiritual and cultural value: sacred groves conserved by communities on several continents, and the recreational use of forests near cities, are part of their contribution to well-being.
The forest sector includes forestry (growing and harvesting), wood processing (sawmilling, panels, furniture) and pulp and paper. Its formal contribution to the global economy is modest as a share of gross domestic product, estimated by FAO at around 1 percent in the early 2010s, but much higher in some countries and regions: in parts of Northern Europe, in Canada, in plantation economies of the Southern Hemisphere and in some tropical countries, forest products are among the leading exports. FAO's State of the World's Forests 2014 estimated formal forest-sector employment at about 13 million people, with at least 40 million more in informal activities such as fuelwood and charcoal production, small-scale logging and the collection of non-wood products, figures that are uncertain but show that informal work exceeds formal employment. International trade in forest products is dominated by sawnwood, panels, pulp and paper, with large flows from Russia, Canada, Northern Europe, the United States, Brazil, Indonesia and New Zealand, and large importing markets in China, Europe, the United States and Japan. Tropical timber trade is a smaller share but important for producer countries and the subject of legality regulations in importing markets. National accounts usually record timber and some processed products but omit most non-wood products, subsistence use and ecosystem services such as watershed protection and carbon storage; natural capital accounting under the UN System of Environmental-Economic Accounting aims to correct this. Forest revenues to governments come from stumpage fees, concession rents, royalties and export taxes, and their collection and fair distribution are long-standing governance issues. The economic case for forests therefore depends on what is counted: when ecosystem services and livelihoods are included, the value of forests is several times the recorded value of timber.
Hundreds of millions of people rely directly on forests for part of their living, and commonly cited estimates from the World Bank and FAO put the number of people who depend on forests to some degree at more than 1 billion. FAO estimated in 2014 that about 2.4 billion people cook with wood fuel, mostly in Africa, Asia and Latin America, making wood the main household energy source for a third of humanity; charcoal supplies many African cities and is a major driver of woodland degradation around them. For rural households, forests provide food, fodder, fuel, medicine, building materials and cash income, and act as a safety net in bad years when crops fail; studies across many tropical countries found that forest and environmental income can account for around a fifth or more of household income on average, with poorer households often more dependent in relative terms. Indigenous peoples and local communities live in or manage a large share of the world's forests, with cultural, spiritual and identity ties to them; their customary rights, knowledge of species and practices such as rotational farming, fire management and sacred groves are increasingly recognised in law and policy, though often still contested. Gender matters: women and men use and value different forest products, women often carry the burden of fuelwood and water collection, and women's rights to forest land and decision-making are frequently weaker. Forest-dependent people are also often among the poorest and most remote, with limited access to markets, credit and services. Policies that restrict access to forests for conservation or production can therefore harm livelihoods unless rights, benefit sharing and alternatives are addressed, and approaches such as community forestry, payments for ecosystem services and small and medium forest enterprises seek to link forest conservation with poverty reduction. Measuring forest dependence requires household surveys, because national statistics rarely capture it.
Sustained yield is the oldest management principle of scientific forestry: the quantity of wood harvested over a period should not exceed what the forest grows, so that a continuous, even flow of timber can be maintained indefinitely. It is put into practice through the normal forest model, rotation ages, annual allowable cuts and yield regulation by area (cutting an equal area each year, area divided by rotation), by volume (cutting a volume based on stock and increment) or by combinations of both. A forest of 6000 hectares managed on a 60-year rotation by area control, for example, cuts 100 hectares each year. Sustained yield was a powerful idea, but in its narrow form it treated forests as timber factories, could be met by replacing diverse natural forests with uniform plantations, and said nothing about non-timber values or people. Multiple use broadened the goal to manage forests for several outputs at once: timber, water, grazing, wildlife, recreation and later wilderness. The concept was written into law in some countries, as in the Multiple-Use Sustained-Yield Act passed in the United States in 1960, and into forest policy in many others. Multiple use can be achieved on the same area (integrated management, for example harvesting with retention of habitat trees and buffer strips) or by zoning different areas for dominant uses within a larger forest (segregation, as in production, protection and conservation zones). The debate between integration (land sharing) and segregation (land sparing) continues and depends on how outputs trade off. Multiple use did not resolve conflicts among users, and its practice often still favoured timber, but it laid the foundation for the broader concept that followed.
Sustainable forest management (SFM) emerged in the late 1980s and early 1990s as the international expression of sustainable development in forests. The non-legally binding Forest Principles adopted at the 1992 UN Conference on Environment and Development in Rio de Janeiro stated that forest resources and forest lands should be sustainably managed to meet the social, economic, ecological, cultural and spiritual needs of present and future generations. The UN General Assembly's Non-Legally Binding Instrument on All Types of Forests of 2007, now called the UN Forest Instrument, describes SFM as a dynamic and evolving concept that aims to maintain and enhance the economic, social and environmental values of all types of forests for the benefit of present and future generations, and lists seven thematic elements: extent of forest resources; forest biological diversity; forest health and vitality; productive functions of forest resources; protective functions of forest resources; socio-economic functions of forests; and the legal, policy and institutional framework. These elements derive from regional criteria-and-indicator (C&I) processes that translate SFM into measurable terms: the ITTO criteria for tropical forests, first issued in 1992; the Pan-European process now called Forest Europe; the Montreal Process for temperate and boreal forests outside Europe; and others such as the Tarapoto proposal for the Amazon and processes for dry-zone Africa and the Near East. Criteria define the essential elements of SFM, and indicators are measurable variables used to track them over time, such as forest area, growing stock, the share of forest in protected areas and forest-sector employment. At the level of the forest management unit, SFM is applied through management plans, reduced-impact logging, high-conservation-value assessment, stakeholder consultation and voluntary certification schemes, which began in the 1990s. The UN Strategic Plan for Forests 2017–2030 sets six Global Forest Goals, the first being to reverse the loss of forest cover worldwide through SFM, with a target to increase forest area by 3 percent by 2030.
Forest tenure determines who owns forests, who may use them, for what and on what terms. It shapes incentives for management and conservation more than almost any technical factor. FRA classifies ownership as public (owned by the state or public administrations at any level, or by institutions or corporations owned by them), private (owned by individuals and families, private businesses and institutions, and local, tribal and indigenous communities when they hold legal ownership), and unknown or other. According to FRA 2020, about 73 percent of the world's forests were publicly owned and about 22 percent privately owned, with the rest unknown; public ownership dominates in most of Africa, Asia, the Russian Federation and Canada, while private ownership is high in parts of Europe, the United States, Oceania and some Latin American countries. Ownership is only part of tenure. FRA also records who holds management rights on public forests: in many countries governments retain them, but in others large areas are assigned to companies through concessions, or to communities through community forestry or co-management. Researchers describe tenure as a bundle of rights, following Schlager and Ostrom: access (to enter), withdrawal (to take products), management (to regulate use and transform the resource), exclusion (to decide who else may use it) and alienation (to sell or lease these rights). An owner holds the full bundle; others hold some rights only, for example a community with access and withdrawal rights but no right to exclude outsiders or to manage. Security of tenure, the confidence that rights will be respected over time and enforced, matters as much as the formal type: insecure rights discourage investment in planting and protection and may encourage rapid clearing.
Industrial concessions grant companies rights to harvest timber, sometimes for decades, on public land, and are widespread in Central Africa, Southeast Asia, Russia and parts of South America. Concession agreements set harvest limits, fees and management obligations, but weak enforcement, short-term interests and overlapping customary claims have often led to overharvesting and conflict; certification and legality verification are partial responses. Since the 1970s many countries have devolved forest rights to communities. Examples include community forestry in Nepal, where community forest user groups manage large areas of national forest under approved operational plans; joint forest management and recognition of forest rights in parts of South Asia; community ownership of forests in Mexico, where ejidos and agrarian communities own most forest land and many run commercial forestry enterprises; village land forest reserves in Tanzania; community forest concessions in the Maya Biosphere Reserve in Guatemala; and recognition of indigenous territories in Brazil, Colombia and other Amazonian countries. Independent analyses of statutory tenure have reported that the share of forests legally owned by or designated for indigenous peoples and local communities has grown since the early 2000s, though it remains well below the area they claim under customary rights. Evidence from many countries suggests that secure community and indigenous tenure is often associated with lower deforestation, particularly where rights include exclusion and are enforced, although outcomes vary with local institutions, markets and government support. Elinor Ostrom's design principles for long-enduring common-property institutions, including clearly defined boundaries, rules matched to local conditions, participation of users in making rules, monitoring, graduated sanctions, conflict-resolution mechanisms and recognition of rights by government, explain why some community systems succeed. Tenure reform is part of international frameworks such as the Voluntary Guidelines on the Responsible Governance of Tenure endorsed by the Committee on World Food Security in 2012.
Forestry draws on biology, earth sciences, engineering, economics and social science, and its subject matter is commonly divided into branches. Silviculture deals with establishing, tending and regenerating forest stands, including silvicultural systems such as clear-felling, shelterwood, selection and coppice, and the silviculture of individual species. Forest mensuration and inventory measure trees and stands (diameter, height, volume, growth) and estimate resources over large areas by sampling, increasingly with remote sensing and LiDAR. Forest management plans the forest as a whole over time: setting objectives, regulating yield, preparing working or management plans and organising operations. Forest economics values forests and their products and services and analyses investment, markets and policy instruments; forest policy and law deal with the rules governing forests and their administration. Forest protection covers threats from insects (forest entomology), diseases (forest pathology), fire, invasive species, grazing and illegal activities. Forest utilisation, harvesting and engineering cover logging, roads and transport, while wood science and technology deals with wood anatomy and properties, seasoning, preservation and products. Forest ecology, forest botany and dendrology provide the biological foundations, and forest genetics and tree improvement develop better planting stock. Newer or allied branches include wildlife science and protected-area management, agroforestry, social and community forestry, urban forestry and arboriculture, watershed management, rangeland management, forest hydrology and forest carbon and climate. Forestry education is organised around these branches, and this track follows the same structure.
Foresters work in diverse settings. In government forest services, they manage public forests, prepare and implement management plans, regulate harvesting on public and private land, protect forests against fire, pests and illegal use, run nurseries and plantation programmes, manage protected areas and wildlife in many countries, support community forestry and extension, and report on forests nationally and internationally. Officer cadres in many countries are recruited through civil-service examinations, and rangers and forest guards through separate recruitment. In industry, foresters plan harvests, establish and manage plantations, procure wood, manage supply chains and implement certification and legality requirements. Consulting foresters advise private owners, investors and governments on inventory, valuation, management and environmental assessment. Researchers and teachers work in universities and research institutes, including international centres. Non-governmental and community organisations employ foresters in conservation, restoration, community enterprise and advocacy. Newer roles include carbon project development and verification, certification auditing, deforestation-free supply-chain monitoring, geospatial analysis and urban forestry. Professional standing is organised differently across countries. Some jurisdictions license or register foresters by law, through examinations or professional review, as in the Philippines, several Canadian provinces and some US states; others recognise professional bodies with chartered or certified status, as in the United Kingdom, Australia, New Zealand and South Africa, or rely on degrees and government recruitment alone. Professional codes of ethics commit foresters to stewardship, honesty, competence and service to society. Across these roles the forester's distinctive skill is integrating biological knowledge, measurement and long time horizons with economic and social realities, and communicating with owners, communities and policy-makers.
Deforestation results from proximate (direct) causes, the human activities that physically remove forest, and underlying causes, the social, economic and political processes that drive those activities. A widely cited synthesis of case studies by Geist and Lambin (2002) identified three main proximate causes, agricultural expansion, wood extraction and infrastructure extension, and five groups of underlying causes: demographic, economic, technological, policy and institutional, and cultural factors, usually acting in combination rather than singly. Agricultural expansion is by far the leading proximate driver: FAO's remote-sensing survey for FRA 2020 found that almost 90 percent of global deforestation was due to agricultural expansion, roughly half to cropland and nearly 40 percent to livestock grazing. The mix differs by region. In South America, conversion to cattle pasture and, to a lesser degree, soy and other commercial crops has dominated; in Southeast Asia, oil palm, pulpwood plantations, rubber and other tree crops along with smallholder farming; in Africa, smallholder and shifting cultivation, often expanding under population growth and poverty, together with charcoal and fuelwood. Commodities produced for distant markets, such as beef, soy, palm oil, cocoa, coffee, rubber and wood, link deforestation to global trade and consumption, which is why importing regions have introduced due-diligence requirements; the European Union's deforestation regulation of 2023 requires that certain commodities placed on its market not come from land deforested after 31 December 2020. Mining, roads, dams and urban expansion are smaller drivers by area but open forests to further clearing: new roads into forest frontiers are among the strongest predictors of deforestation. Underlying causes include insecure tenure, weak governance and corruption, subsidies and credit for agriculture, commodity prices, exchange rates and policies that reward clearing as proof of land use.
Forest degradation reduces carbon stocks, biodiversity and the provision of services without changing land use. Its main drivers are selective and illegal logging, particularly in Latin America and Southeast Asia; fuelwood and charcoal collection, particularly in Africa and South Asia; uncontrolled fire, often escaping from agricultural burning; overgrazing; and fragmentation, which exposes forest edges to drying, wind and fire. Degraded forests are more flammable, and repeated fires can push humid tropical forests towards a more open, savanna-like state. Degradation is harder to measure than deforestation because canopy cover may remain above the forest threshold, and different definitions give very different estimates. Over time, many countries have followed a forest transition, a pattern described by Mather in which forest area first declines with agricultural expansion and then, as economies urbanise and farming intensifies on the best land, stabilises and recovers through abandonment of marginal land and planting. Western Europe, the eastern United States, and more recently China, Vietnam, India and others report recovering forest area, but transitions can partly displace deforestation to other countries through imports of food and wood. International responses include protected areas and indigenous territories; reducing emissions from deforestation and forest degradation (REDD+), developed under the UN climate convention, which offers results-based payments to developing countries; zero-deforestation commitments by companies; legality regulations for timber in importing markets; the New York Declaration on Forests (2014) and the Glasgow Leaders' Declaration on Forests and Land Use (2021), which committed signatories to halt and reverse forest loss and land degradation by 2030; and restoration initiatives such as the Bonn Challenge and the UN Decade on Ecosystem Restoration (2021–2030). Independent assessments have found that the world is not on track to meet the 2030 goal. Effective action usually combines enforcement, secure tenure, support for productive agriculture on already cleared land, finance and transparent monitoring.
No single global treaty governs forests; instead, forests are addressed by several institutions and by conventions on climate, biodiversity, desertification, wetlands and trade in endangered species. The Food and Agriculture Organization of the United Nations, founded in 1945 with headquarters in Rome, hosts the main technical forestry programme of the UN system. It compiles the Global Forest Resources Assessment every five years, publishes the State of the World's Forests, maintains global statistics on forest products production and trade, supports national forest monitoring, policies and programmes, and convenes the Committee on Forestry (COFO), its main intergovernmental forestry body, and regional forestry commissions. It also co-organises the World Forestry Congress, held about every six years since the first in Rome in 1926. The United Nations Forum on Forests (UNFF) was established in 2000 by the UN Economic and Social Council as a subsidiary body with universal membership, to promote the management, conservation and sustainable development of all types of forests and strengthen long-term political commitment. It negotiated the UN Forest Instrument (2007) and the UN Strategic Plan for Forests 2017–2030 with its six Global Forest Goals, and it reviews progress through national reports. The Collaborative Partnership on Forests (CPF), formed in 2001, links international organisations with forest programmes, including FAO, which chairs it, the UNFF secretariat, the secretariats of the climate, biodiversity and desertification conventions, ITTO, IUFRO, the World Bank, UNEP, UNDP, the Global Environment Facility and research centres, to coordinate their work. The UN General Assembly proclaimed 21 March as the International Day of Forests in 2012.
The International Union of Forest Research Organizations (IUFRO), founded in 1892 by forest research institutes in German-speaking Europe, is the global network for forest science, with hundreds of member organisations and thousands of scientists in most countries. Its headquarters are in Vienna. It organises research groups by discipline, holds a World Congress every five years, and runs science-policy programmes, including Global Forest Expert Panels that produce assessments on topics such as forests and water, forests and food security, and forest fires. The International Tropical Timber Organization (ITTO), headquartered in Yokohama, Japan, was established under the International Tropical Timber Agreement of 1983 and became operational in the mid-1980s; later agreements were concluded in 1994 and 2006. It is unusual among commodity bodies in that its members are both producer countries, with tropical forests, and consumer countries that import tropical timber, and its objectives combine expansion and diversification of international trade in tropical timber from sustainably managed and legally harvested forests with the sustainable management of tropical forests. ITTO pioneered criteria and indicators for sustainable tropical forest management in 1992, issues guidelines on topics such as restoration and forest fire, funds projects in member countries and publishes market information. Other important bodies include the UN Framework Convention on Climate Change, under which REDD+ was agreed; the Convention on Biological Diversity, with its forest biodiversity work and the Kunming–Montreal Global Biodiversity Framework of 2022; the UN Convention to Combat Desertification for drylands; CITES, which regulates international trade in listed tree species such as some rosewoods and mahoganies; the World Bank and its forest carbon funds; the Center for International Forestry Research and World Agroforestry (CIFOR-ICRAF); and regional bodies and networks in Africa, Asia-Pacific and Latin America. Voluntary certification organisations for forest management and chain of custody, founded in the 1990s, are non-governmental but influential parts of international forest governance.
A student uses this subject as the map of the whole degree: what each later subject covers and how they fit together. The skills to build are applying the FAO definitions to real cases (an oil palm estate, a clear-felled plantation, an open woodland), reading FRA tables without mixing editions or confusing tree-cover loss with deforestation, explaining sustained yield and SFM precisely, and naming the drivers of deforestation in different regions. Examiners repeatedly test definitions, thresholds, dates and institutions.
A forester five years into a forest service, company or NGO applies these concepts daily: checking whether a planned conversion counts as deforestation under national law and buyers' requirements, preparing reports that use FRA definitions, negotiating with communities whose tenure rights overlap a concession or plantation, and explaining to managers how certification and C&I translate SFM into field practice. Knowing the international bodies helps in finding guidance, funding and data.
A senior forester with twenty-five years of experience shapes national programmes and corporate strategies: setting forest-area and restoration targets, reforming tenure and concession systems, responding to deforestation-free trade rules, and representing a country or company in FAO, UNFF, ITTO or climate negotiations. Judgements involve weighing production against protection, balancing state, private and community roles, and using the lessons of forestry's colonial and industrial history to avoid repeating its mistakes.
A researcher with a PhD and long experience studies forest transitions, the effects of tenure on deforestation, the accuracy of global forest statistics and the history of forestry institutions, often contributing to FRA, IUFRO assessments or IPCC and IPBES reports. Such researchers teach the introductory course that frames the profession for new students, supervise theses across branches and set examination questions, so they must keep definitions, figures and institutional facts current with each new assessment.
Global figures in this manual are from FRA 2020 and earlier FAO publications; FRA 2025 has since revised forest area and change estimates, and readers should use the latest edition consistently. Employment, dependence and GDP figures are FAO or World Bank estimates with large uncertainty. The history chapter focuses on the European roots and the British-Indian service named in the curriculum and gives only brief notes on forest traditions in East Asia, Latin America and Africa, and on pre-colonial indigenous forest management, which deserve fuller treatment. National forest laws and agencies are not described country by country.
Original practice questions written to the syllabus and pattern of the exams named in each question's examTags. They are not past papers and do not reproduce any board's questions.
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