The Saskatchewan Environmental Society (SES) is an environmental charity based in Saskatoon , Saskatchewan . Founded in 1970 as a local volunteer organization, the Society's work has since expanded to encompass the entire province on a wide range of environmental issues.
130-615: In August 1970 the SES was formed as the Saskatoon Environmental Society by a group of 100 local environmentalists during the first wave of the modern environmental movement . The group sprang up initially out of concerns stemming from years of industrial development with little environmental oversight. However, early organizers opted to orient the group on building awareness and making constructive recommendations rather than on narrowly protesting pollution, while basing their outlook in
260-409: A cell wall . Newly dead animals may be covered by an exoskeleton . Fragmentation processes, which break through these protective layers, accelerate the rate of microbial decomposition. Animals fragment detritus as they hunt for food, as does passage through the gut. Freeze-thaw cycles and cycles of wetting and drying also fragment dead material. The chemical alteration of the dead organic matter
390-495: A food chain . Real systems are much more complex than this—organisms will generally feed on more than one form of food, and may feed at more than one trophic level. Carnivores may capture some prey that is part of a plant-based trophic system and others that are part of a detritus-based trophic system (a bird that feeds both on herbivorous grasshoppers and earthworms, which consume detritus). Real systems, with all these complexities, form food webs rather than food chains which present
520-605: A habitat . Ecosystem ecology is the "study of the interactions between organisms and their environment as an integrated system". The size of ecosystems can range up to ten orders of magnitude , from the surface layers of rocks to the surface of the planet. The Hubbard Brook Ecosystem Study started in 1963 to study the White Mountains in New Hampshire . It was the first successful attempt to study an entire watershed as an ecosystem. The study used stream chemistry as
650-609: A central role over a wide range, for example, in the slow development of soil from bare rock and the faster recovery of a community from disturbance . Disturbance also plays an important role in ecological processes. F. Stuart Chapin and coauthors define disturbance as "a relatively discrete event in time that removes plant biomass". This can range from herbivore outbreaks, treefalls, fires, hurricanes, floods, glacial advances , to volcanic eruptions . Such disturbances can cause large changes in plant, animal and microbe populations, as well as soil organic matter content. Disturbance
780-669: A country to actively manage and protect its environment and the health of its citizens. A weighted index is created by giving 50% weight for environmental health objective (health) and 50% for ecosystem vitality (ecosystem); values range from 0–100. No Arab countries were in the top quartile, and 7 countries were in the lowest quartile. South Korea and Taiwan experienced similar growth in industrialization from 1965 to 1990 with few environmental controls. South Korea's Han River and Nakdong River were so polluted by unchecked dumping of industrial waste that they were close to being classified as biologically dead. Taiwan's formula for balanced growth
910-507: A critical role in global nutrient cycling and ecosystem function. Phosphorus enters ecosystems through weathering . As ecosystems age this supply diminishes, making phosphorus-limitation more common in older landscapes (especially in the tropics). Calcium and sulfur are also produced by weathering, but acid deposition is an important source of sulfur in many ecosystems. Although magnesium and manganese are produced by weathering, exchanges between soil organic matter and living cells account for
1040-611: A debate about growth, affluence and "flawed technology." Additionally, an association of scientists and political leaders known as the Club of Rome published their report The Limits to Growth in 1972, and drew attention to the growing pressure on natural resources from human activities. Meanwhile, technological accomplishments such as nuclear proliferation and photos of the Earth from outer space provided both new insights and new reasons for concern over Earth's seemingly small and unique place in
1170-682: A decade before began to have some political success. In 1986, there was a nuclear accident in Chernobyl , Ukraine . A large-scale environmental campaign was staged in Ukraine in 1986. The end of the 1980s and start of the 1990s saw the fall of communism across central and Eastern Europe, the fall of the Berlin Wall , and the Union of East and West Germany. In 1992 there was a UN summit held in Rio de Janeiro where Agenda 21
1300-517: A faster recovery. More severe and more frequent disturbance result in longer recovery times. From one year to another, ecosystems experience variation in their biotic and abiotic environments. A drought , a colder than usual winter, and a pest outbreak all are short-term variability in environmental conditions. Animal populations vary from year to year, building up during resource-rich periods and crashing as they overshoot their food supply. Longer-term changes also shape ecosystem processes. For example,
1430-454: A form that can be readily used by plants and microbes. Ecosystems provide a variety of goods and services upon which people depend, and may be part of. Ecosystem goods include the "tangible, material products" of ecosystem processes such as water, food, fuel, construction material, and medicinal plants . Ecosystem services , on the other hand, are generally "improvements in the condition or location of things of value". These include things like
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#17328987463481560-427: A function-based typology has been proposed to leverage the strengths of these different approaches into a unified system. Human activities are important in almost all ecosystems. Although humans exist and operate within ecosystems, their cumulative effects are large enough to influence external factors like climate. Ecosystems provide a variety of goods and services upon which people depend. Ecosystem goods include
1690-698: A general level, for example, tropical forests , temperate grasslands , and arctic tundra . There can be any degree of subcategories among ecosystem types that comprise a biome, e.g., needle-leafed boreal forests or wet tropical forests. Although ecosystems are most commonly categorized by their structure and geography, there are also other ways to categorize and classify ecosystems such as by their level of human impact (see anthropogenic biome ), or by their integration with social processes or technological processes or their novelty (e.g. novel ecosystem ). Each of these taxonomies of ecosystems tends to emphasize different structural or functional properties. None of these
1820-449: A heart to enjoy". The modern conservation movement was first manifested in the forests of India , with the practical application of scientific conservation principles. The conservation ethic that began to evolve included three core principles: human activity damaged the environment , there was a civic duty to maintain the environment for future generations, and scientific, empirically based methods should be applied to ensure this duty
1950-542: A large inflow of immigrants that are living in substandard housing. Enforcement of the pollution standards is lax and penalties are minimal; in Venezuela, the largest penalty for violating an environmental law is 50,000 bolivar fine ($ 3,400) and three days in jail. In the 1970s or 1980s, many Latin American countries were transitioning from military dictatorships to democratic governments. In 1992, Brazil came under scrutiny with
2080-523: A long-term and holistic concept of sustainability. The group's early activity focused on press releases and government briefs, and the SES was instrumental in the formation of Saskatoon's first Environmental Advisory Council in 1973 to monitor and advise the city on environmental issues. The SES was also instrumental in the passage of the Saskatchewan Heritage Act. The group did at times find itself protesting, such as successfully organizing against
2210-665: A means of monitoring ecosystem properties, and developed a detailed biogeochemical model of the ecosystem. Long-term research at the site led to the discovery of acid rain in North America in 1972. Researchers documented the depletion of soil cations (especially calcium) over the next several decades. Ecosystems can be studied through a variety of approaches—theoretical studies, studies monitoring specific ecosystems over long periods of time, those that look at differences between ecosystems to elucidate how they work and direct manipulative experimentation. Studies can be carried out at
2340-473: A ministry is also indicative of the level of engagement. Saudi Arabia was the first to establish environmental law in 1992 followed by Egypt in 1994. Somalia is the only country without environmental law. In 2010 the Environmental Performance Index listed Algeria as the top Arab country at 42 of 163; Morocco was at 52 and Syria at 56. The Environmental Performance Index measures the ability of
2470-528: A more important role in moving nutrients around. This can be especially important as the soil thaws in the spring, creating a pulse of nutrients that become available. Decomposition rates are low under very wet or very dry conditions. Decomposition rates are highest in wet, moist conditions with adequate levels of oxygen. Wet soils tend to become deficient in oxygen (this is especially true in wetlands ), which slows microbial growth. In dry soils, decomposition slows as well, but bacteria continue to grow (albeit at
2600-471: A mythical Utopia and advocated a return to it. John Ruskin argued that people should return to a "small piece of English ground, beautiful, peaceful, and fruitful. We will have no steam engines upon it ... we will have plenty of flowers and vegetables ... we will have some music and poetry; the children will learn to dance to it and sing it." Practical ventures in the establishment of small cooperative farms were even attempted and old rural traditions, without
2730-406: A number of common, non random properties in the topology of their network. The carbon and nutrients in dead organic matter are broken down by a group of processes known as decomposition. This releases nutrients that can then be re-used for plant and microbial production and returns carbon dioxide to the atmosphere (or water) where it can be used for photosynthesis. In the absence of decomposition,
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#17328987463482860-421: A process known as denitrification . Mycorrhizal fungi which are symbiotic with plant roots, use carbohydrates supplied by the plants and in return transfer phosphorus and nitrogen compounds back to the plant roots. This is an important pathway of organic nitrogen transfer from dead organic matter to plants. This mechanism may contribute to more than 70 Tg of annually assimilated plant nitrogen, thereby playing
2990-411: A professional botanist who systematically adopted a forest conservation programme based on scientific principles. This was the first case of state management of forests in the world. Eventually, the government under Governor-General Lord Dalhousie introduced the first permanent and large-scale forest conservation programme in the world in 1855, a model that soon spread to other colonies , as well as
3120-687: A provincial role and the SES did rebrand with 'Saskatchewan' replacing 'Saskatoon' in its name. The following year, members endorsed a 12-point plan for the Society that touched on a number of activities and sectors such as agriculture, forestry, mining, water and land management, and the nuclear arms race. The SES' influence continued to expand in the following years, attracting enough funding to hire staff members and securing invitations to government consultations, including Environment Canada 's first public consultation meeting in Ottawa in 1982. Beyond government lobbying,
3250-620: A series of investigations into the Desirability of establishing a 'Close-time' for the preservation of indigenous animals between 1872 and 1903. His advocacy for legislation to protect animals from hunting during the mating season led to the formation of the Plumage League (later the Royal Society for the Protection of Birds) in 1889. The society acted as a protest group campaigning against
3380-696: A significant portion of ecosystem fluxes. Potassium is primarily cycled between living cells and soil organic matter. Biodiversity plays an important role in ecosystem functioning. Ecosystem processes are driven by the species in an ecosystem, the nature of the individual species, and the relative abundance of organisms among these species. Ecosystem processes are the net effect of the actions of individual organisms as they interact with their environment. Ecological theory suggests that in order to coexist, species must have some level of limiting similarity —they must be different from one another in some fundamental way, otherwise, one species would competitively exclude
3510-555: A simple life. He published his experiences in the book Walden , which argues that people should become intimately close with nature. Muir came to believe in nature's inherent right, especially after spending time hiking in Yosemite Valley and studying both the ecology and geology. He successfully lobbied congress to form Yosemite National Park and went on to set up the Sierra Club in 1892. The conservationist principles as well as
3640-408: A slower rate) even after soils become too dry to support plant growth. Ecosystems are dynamic entities. They are subject to periodic disturbances and are always in the process of recovering from past disturbances. When a perturbation occurs, an ecosystem responds by moving away from its initial state. The tendency of an ecosystem to remain close to its equilibrium state, despite that disturbance,
3770-464: A small effect on ecosystem function. Ecologically distinct species, on the other hand, have a much larger effect. Similarly, dominant species have a large effect on ecosystem function, while rare species tend to have a small effect. Keystone species tend to have an effect on ecosystem function that is disproportionate to their abundance in an ecosystem. An ecosystem engineer is any organism that creates, significantly modifies, maintains or destroys
3900-548: A successful campaign to prevent the construction of railways to carry slate from the quarries, which would have ruined the unspoilt valleys of Newlands and Ennerdale . This success led to the formation of the Lake District Defence Society (later to become The Friends of the Lake District). In 1893 Hill, Hunter and Rawnsley agreed to set up a national body to coordinate environmental conservation efforts across
4030-526: A system to absorb disturbance and reorganize while undergoing change so as to retain essentially the same function, structure, identity, and feedbacks is termed its ecological resilience . Ecosystems can be studied through a variety of approaches—theoretical studies, studies monitoring specific ecosystems over long periods of time, those that look at differences between ecosystems to elucidate how they work and direct manipulative experimentation. Biomes are general classes or categories of ecosystems. However, there
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4160-522: A variety of scales, ranging from whole-ecosystem studies to studying microcosms or mesocosms (simplified representations of ecosystems). American ecologist Stephen R. Carpenter has argued that microcosm experiments can be "irrelevant and diversionary" if they are not carried out in conjunction with field studies done at the ecosystem scale. In such cases, microcosm experiments may fail to accurately predict ecosystem-level dynamics. Biomes are general classes or categories of ecosystems. However, there
4290-634: A wider appeal and influence. Although it lacked a single co-ordinating organization the anti-nuclear movement 's efforts gained a great deal of attention, especially in the United Kingdom and United States. In the aftermath of the Three Mile Island accident in 1979, many mass demonstrations took place. The largest one was held in New York City in September 1979 and involved 200,000 people. Since
4420-466: Is also on the rise and environmentalists argue that these also contain risks, if these organisms were ever to end up in nature. This, as unlike with genetically modified organisms, synthetic biology even uses base pairs that do not exist in nature. In the early 1990s, multiple environmental activists in the United States became targets of violent attacks. In 2022, Global Witness reported that, in
4550-454: Is an international synthesis by over 1000 of the world's leading biological scientists that analyzes the state of the Earth's ecosystems and provides summaries and guidelines for decision-makers. The report identified four major categories of ecosystem services: provisioning, regulating, cultural and supporting services. It concludes that human activity is having a significant and escalating impact on
4680-672: Is characterized by the rise of environmental NGOs, policy advocacy, spontaneous alliances, and protests that often only occur at the local level. Environmental protests in China are increasingly expanding their scope of concerns, calling for broader participation "in the name of the public." The Chinese have realized the ability of riots and protests to have success and had led to an increase in disputes in China by 30% since 2005 to more than 50,000 events. Protests cover topics such as environmental issues, land loss , income, and political issues. They have also grown in size from about 10 people or fewer in
4810-442: Is consumed by animals while still alive and enters the plant-based trophic system. After plants and animals die, the organic matter contained in them enters the detritus-based trophic system. Ecosystem respiration is the sum of respiration by all living organisms (plants, animals, and decomposers) in the ecosystem. Net ecosystem production is the difference between gross primary production (GPP) and ecosystem respiration. In
4940-423: Is controlled by internal factors. Therefore, internal factors not only control ecosystem processes but are also controlled by them. Ecosystems are dynamic entities—they are subject to periodic disturbances and are always in the process of recovering from some past disturbance. The tendency of an ecosystem to remain close to its equilibrium state, despite that disturbance, is termed its resistance . The capacity of
5070-569: Is followed by succession, a "directional change in ecosystem structure and functioning resulting from biotically driven changes in resource supply." The frequency and severity of disturbance determine the way it affects ecosystem function. A major disturbance like a volcanic eruption or glacial advance and retreat leave behind soils that lack plants, animals or organic matter. Ecosystems that experience such disturbances undergo primary succession . A less severe disturbance like forest fires, hurricanes or cultivation result in secondary succession and
5200-554: Is governed by three sets of factors—the physical environment (temperature, moisture, and soil properties), the quantity and quality of the dead material available to decomposers, and the nature of the microbial community itself. Temperature controls the rate of microbial respiration; the higher the temperature, the faster the microbial decomposition occurs. Temperature also affects soil moisture, which affects decomposition. Freeze-thaw cycles also affect decomposition—freezing temperatures kill soil microorganisms, which allows leaching to play
5330-405: Is no clear distinction between biomes and ecosystems. Biomes are always defined at a very general level. Ecosystems can be described at levels that range from very general (in which case the names are sometimes the same as those of biomes) to very specific, such as "wet coastal needle-leafed forests". Biomes vary due to global variations in climate . Biomes are often defined by their structure: at
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5460-516: Is no clear distinction between biomes and ecosystems. Ecosystem classifications are specific kinds of ecological classifications that consider all four elements of the definition of ecosystems : a biotic component, an abiotic complex, the interactions between and within them, and the physical space they occupy. Biotic factors of the ecosystem are living things; such as plants, animals, and bacteria, while abiotic are non-living components; such as water, soil and atmosphere. Plants allow energy to enter
5590-531: Is primarily achieved through bacterial and fungal action. Fungal hyphae produce enzymes that can break through the tough outer structures surrounding dead plant material. They also produce enzymes that break down lignin , which allows them access to both cell contents and the nitrogen in the lignin. Fungi can transfer carbon and nitrogen through their hyphal networks and thus, unlike bacteria, are not dependent solely on locally available resources. Decomposition rates vary among ecosystems. The rate of decomposition
5720-485: Is termed its resistance . The capacity of a system to absorb disturbance and reorganize while undergoing change so as to retain essentially the same function, structure, identity, and feedbacks is termed its ecological resilience . Resilience thinking also includes humanity as an integral part of the biosphere where we are dependent on ecosystem services for our survival and must build and maintain their natural capacities to withstand shocks and disturbances. Time plays
5850-422: Is the "best" classification. Ecosystem classifications are specific kinds of ecological classifications that consider all four elements of the definition of ecosystems : a biotic component, an abiotic complex, the interactions between and within them, and the physical space they occupy. Different approaches to ecological classifications have been developed in terrestrial, freshwater and marine disciplines, and
5980-801: The Aarhus Convention . In 2023, the Environmental Protection Agency announced on Jan 10. that the first $ 100 million in federal environmental justice will open up to community organizations, local governments and other qualified applicants in the coming weeks. Beginning in the conservation movement at the beginning of the 20th century, the contemporary environmental movement's roots can be traced back to Rachel Carson 's 1962 book Silent Spring , Murray Bookchin 's 1962 book Our Synthetic Environment , and Paul R. Ehrlich 's 1968 The Population Bomb . American environmentalists have campaigned against nuclear weapons and nuclear power in
6110-621: The United Nations Conference on Environment and Development in Rio de Janeiro. Brazil has a history of little environmental awareness. It has the highest biodiversity in the world and also the highest amount of habitat destruction . One-third of the world's forests lie in Brazil. It is home to the largest river, The Amazon , and the largest rainforest, the Amazon Rainforest . People have raised funds to create state parks and increase
6240-654: The United States . In 1860, the Department banned the use of shifting cultivation . Hugh Cleghorn 's 1861 manual, The forests and gardens of South India , became the definitive work on the subject and was widely used by forest assistants in the subcontinent. Dietrich Brandis joined the British service in 1856 as superintendent of the teak forests of Pegu division in eastern Burma . During that time Burma's teak forests were controlled by militant Karen tribals. He introduced
6370-427: The ecology movement ) is a social movement that aims to protect the natural world from harmful environmental practices in order to create sustainable living . Environmentalists advocate the just and sustainable management of resources and stewardship of the environment through changes in public policy and individual behavior. In its recognition of humanity as a participant in (not an enemy of) ecosystems ,
6500-555: The resource inputs are generally controlled by external processes like climate and parent material, the availability of these resources within the ecosystem is controlled by internal factors like decomposition, root competition or shading. Other factors like disturbance, succession or the types of species present are also internal factors. Primary production is the production of organic matter from inorganic carbon sources. This mainly occurs through photosynthesis . The energy incorporated through this process supports life on earth, while
6630-578: The "taint of manufacture or the canker of artificiality", were enthusiastically revived, including the Morris dance and the maypole . The movement in the United States began in the late 19th century, out of concerns for protecting the natural resources of the West, with individuals such as John Muir and Henry David Thoreau making key philosophical contributions. Thoreau was interested in peoples' relationship with nature and studied this by living close to nature in
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#17328987463486760-435: The "tangible, material products" of ecosystem processes such as water, food, fuel, construction material, and medicinal plants . They also include less tangible items like tourism and recreation, and genes from wild plants and animals that can be used to improve domestic species. Ecosystem services , on the other hand, are generally "improvements in the condition or location of things of value". These include things like
6890-483: The "taungya" system, in which Karen villagers provided labour for clearing, planting, and weeding teak plantations. Also, he formulated new forest legislation and helped establish research and training institutions. Brandis as well as founded the Imperial Forestry School at Dehradun. The late 19th century saw the formation of the first wildlife conservation societies. The zoologist Alfred Newton published
7020-691: The 1960s and 1970s, acid rain in the 1980s, ozone depletion and deforestation in the 1990s, and most recently climate change and global warming . The United States passed many pieces of environmental legislation in the 1970s, such as the Clean Water Act , the Clean Air Act , the Endangered Species Act , and the National Environmental Policy Act . These remain as the foundations for current environmental standards. In
7150-565: The 1970s, public awareness, environmental sciences , ecology , and technology have advanced to include modern focus points like ozone depletion, global climate change , acid rain , mutation breeding , genetically modified crops and genetically modified livestock . With mutation breeding, crop cultivars were created by exposing seeds to chemicals or radiation. Many of these cultivars are still being used today. Genetically modified plants and animals are said by some environmentalists to be inherently bad because they are unnatural. Others point out
7280-690: The 1990s, the anti-environmental 'Wise Use' movement emerged in the United States. After the International Environmental Conference in Stockholm in 1972 Latin American officials returned with a high hope of growth and protection of the fairly untouched natural resources. Governments spent millions of dollars, and created departments and pollution standards. However, the outcomes have not always been what officials had initially hoped. Activists blame this on growing urban populations and industrial growth. Many Latin American countries have had
7410-552: The 20th century, environmental ideas continued to grow in popularity and recognition. Efforts were beginning to be made to save wildlife, particularly the American bison . The death of the last passenger pigeon as well as the endangerment of the American bison helped to focus the minds of conservationists and popularize their concerns. In 1916, the National Park Service was founded by U.S. President Woodrow Wilson . Pioneers of
7540-557: The 23-man crew of the Japanese fishing vessel Lucky Dragon 5 to radioactive fallout. The incident is known as Castle Bravo , the largest thermonuclear device ever detonated by the United States and the first in a series of high-yield thermonuclear weapon design tests. In 1967 the oil tanker Torrey Canyon ran aground off the coast of Cornwall , and in 1969 oil spilled from an offshore well in California's Santa Barbara Channel . In 1971,
7670-906: The Co-op announced a new project that plans to build a nearly 1,000-panel solar array on an industrial site in Saskatoon. Another prominent project is the Renewable Rides program, which helped the Saskatoon Car-Share Co-op become the first public car-share with solar-powered electric vehicles. SES has also placed a focus on rural Saskatchewan communities, including through the Low Carbon Stories project, which engaged rural communities, farmers, and Indigenous communities to highlight innovative local climate solutions. Environmental movement The environmental movement (sometimes referred to as
7800-646: The EPA. Beginning in 1969 and continuing into the 1970s, Illinois-based environmental activist James F. Phillips engaged in numerous covert anti-pollution campaigns using the pseudonym "the Fox." His activities included plugging illegal sewage outfall pipes and dumping toxic wastewater produced by a US Steel factory inside the company's Chicago corporate office. Phillips' "ecotage" campaigns attracted considerable media attention and subsequently inspired other direct action protests against environmental destruction. The first Earth Day
7930-704: The Indian environmental movement consider global warming, sea levels rising, and glaciers retreating decreasing the amount of water flowing into streams to be the biggest challenges for them to face in the early twenty-first century. Eco Revolution movement has been started by Eco Needs Foundation in 2008 from Aurangabad Maharashtra that seeks the participation of children, youth, researchers, spiritual and political leaders to organise awareness programmes and conferences. Child activists against air pollution in India and greenhouse gas emissions by India include Licypriya Kangujam . From
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#17328987463488060-471: The League of Arab States have demonstrated an interest in environmental issues, on paper some environmental activists have doubts about the level of commitment to environmental issues; being a part of the world community may have obliged these countries to portray concern for the environment. The initial level of environmental awareness may be the creation of a ministry of the environment. The year of establishment of
8190-481: The absence of disturbance, net ecosystem production is equivalent to the net carbon accumulation in the ecosystem. Energy can also be released from an ecosystem through disturbances such as wildfire or transferred to other ecosystems (e.g., from a forest to a stream to a lake) by erosion . In aquatic systems , the proportion of plant biomass that gets consumed by herbivores is much higher than in terrestrial systems. In trophic systems, photosynthetic organisms are
8320-559: The amenity movement in Britain in the 1870s, which was a reaction to industrialization , the growth of cities, and worsening air and water pollution . Starting with the formation of the Commons Preservation Society in 1865, the movement championed rural preservation against the encroachments of industrialisation. Robert Hunter , solicitor for the society, worked with Hardwicke Rawnsley , Octavia Hill , and John Ruskin to lead
8450-402: The amount of energy available to the ecosystem. Parent material determines the nature of the soil in an ecosystem, and influences the supply of mineral nutrients. Topography also controls ecosystem processes by affecting things like microclimate , soil development and the movement of water through a system. For example, ecosystems can be quite different if situated in a small depression on
8580-504: The amount of light available, the amount of leaf area a plant has to capture light (shading by other plants is a major limitation of photosynthesis), the rate at which carbon dioxide can be supplied to the chloroplasts to support photosynthesis, the availability of water, and the availability of suitable temperatures for carrying out photosynthesis. Energy and carbon enter ecosystems through photosynthesis, are incorporated into living tissue, transferred to other organisms that feed on
8710-492: The belief in an inherent right of nature were to become the bedrock of modern environmentalism. However, the early movement in the U.S. developed with a contradiction; preservationists like John Muir wanted land and nature set aside for its own sake, and conservationists, such as Gifford Pinchot (appointed as the first Chief of the US Forest Service from 1905 to 1910), wanted to manage natural resources for human use. In
8840-408: The carbon makes up much of the organic matter in living and dead biomass, soil carbon and fossil fuels . It also drives the carbon cycle , which influences global climate via the greenhouse effect . Through the process of photosynthesis, plants capture energy from light and use it to combine carbon dioxide and water to produce carbohydrates and oxygen . The photosynthesis carried out by all
8970-628: The coast. In 1972, in Stockholm, the United Nations Conference on the Human Environment created the UN Environment Programme . The EU's environmental policy was formally founded by a European Council declaration and the first five-year environment programme was adopted. The main idea of the declaration was that prevention is better than the cure and the polluter should pay. In the 1980s the green parties that were created
9100-432: The combustion of fossil fuels, ammonia gas which evaporates from agricultural fields which have had fertilizers applied to them, and dust. Anthropogenic nitrogen inputs account for about 80% of all nitrogen fluxes in ecosystems. When plant tissues are shed or are eaten, the nitrogen in those tissues becomes available to animals and microbes. Microbial decomposition releases nitrogen compounds from dead organic matter in
9230-524: The coming years. Environmental and public health is an ongoing struggle within India. The first seed of an environmental movement in India was the foundation in 1964 of Dasholi Gram Swarajya Sangh , a labour cooperative started by Chandi Prasad Bhatt . It was inaugurated by Sucheta Kriplani and founded on land donated by Shyma Devi. This initiative was eventually followed up with the Chipko movement starting in 1974. The most severe single event underpinning
9360-418: The concept to draw attention to the importance of transfers of materials between organisms and their environment. He later refined the term, describing it as "The whole system, ... including not only the organism-complex, but also the whole complex of physical factors forming what we call the environment". Tansley regarded ecosystems not simply as natural units, but as "mental isolates". Tansley later defined
9490-526: The conclusion of a lawsuit in Japan drew international attention to the effects of decades of mercury poisoning on the people of Minamata . At the same time, emerging scientific research drew new attention to existing and hypothetical threats to the environment and humanity. Among them were Paul R. Ehrlich , whose book The Population Bomb (1968) revived Malthusian concerns about the impact of exponential population growth. Biologist Barry Commoner generated
9620-436: The concomitant immense growth in coal consumption gave rise to an unprecedented level of air pollution in industrial centers; after 1900 the large volume of industrial chemical discharges added to the growing load of untreated human waste. Under increasing political pressure from the urban middle-class, the first large-scale, modern environmental laws came in the form of Britain's Alkali Acts , passed in 1863, to regulate
9750-481: The consciousness of people who have destroyed forests and polluted waterways. From 1973 to the 1990s, and then in the 2000s, indigenous communities and rubber tappers also carried out blockades that protected much rainforest. It is home to several organizations that have fronted the environmental movement. The Blue Wave Foundation was created in 1989 and has partnered with advertising companies to promote national education campaigns to keep Brazil's beaches clean. Funatura
9880-428: The costs of environmental negligence, disease, and the expansion of air and water pollution through the occurrence of several environmental disasters that occurred post-World War II. Aldo Leopold published A Sand County Almanac in 1949. He believed in a land ethic that recognized that maintaining the "beauty, integrity, and health of natural systems" as a moral and ethical imperative. Another major literary force in
10010-453: The country; the " National Trust for Places of Historic Interest or Natural Beauty " was formally inaugurated in 1894. The organisation obtained secure footing through the 1907 National Trust Bill, which gave the trust the status of a statutory corporation. and the bill was passed in August 1907. An early "Back-to-Nature" movement, which anticipated the romantic ideal of modern environmentalism,
10140-419: The creation of Earth First! , a group with an ecocentric view of the world – believing in equality between the rights of humans to flourish, the rights of all other species to flourish and the rights of life-sustaining systems to flourish. In the 1950s, 1960s, and 1970s, several events illustrated the magnitude of environmental damage caused by humans. In 1954, a hydrogen bomb test at Bikini Atoll exposed
10270-583: The damming of the Churchill River and consequent flooding of large tracts of the province's boreal forest , and organizing against uranium and nuclear power development. Despite involving itself in a number of issues of provincial concern, the SES was initially reluctant to officially expand its mandate and members voted against re-branding as the Saskatchewan Environmental Society in 1975. By 1981 this reluctance gave way to embracing
10400-403: The dead organic matter would accumulate in an ecosystem, and nutrients and atmospheric carbon dioxide would be depleted. Decomposition processes can be separated into three categories— leaching , fragmentation and chemical alteration of dead material. As water moves through dead organic matter, it dissolves and carries with it the water-soluble components. These are then taken up by organisms in
10530-589: The deleterious air pollution ( gaseous hydrochloric acid ) given off by the Leblanc process , used to produce soda ash . Early interest in the environment was a feature of the Romantic movement in the early 19th century. The poet William Wordsworth had travelled extensively in England's Lake District and wrote that it is a "sort of national property in which every man has a right and interest who has an eye to perceive and
10660-501: The early 2000s, activists believed that environmental policy concerns were overshadowed by energy security, globalism, and terrorism. Since that time major movements concerning issues such as climate change, fracking and other issues have arisen. The environmental movement is reaching the less developed world with different degrees of success. The Arab world , including the Middle East and North Africa , has different adaptations of
10790-643: The ecosystem or to gradual disruption of biotic processes and degradation of abiotic conditions of the ecosystem. Once the original ecosystem has lost its defining features, it is considered "collapsed ". Ecosystem restoration can contribute to achieving the Sustainable Development Goals . An ecosystem (or ecological system) consists of all the organisms and the abiotic pools (or physical environment) with which they interact. The biotic and abiotic components are linked together through nutrient cycles and energy flows. "Ecosystem processes" are
10920-431: The environmental movement in India is the anti-dam movement. Dam creation has been thought of as a way for India to catch up with the West by connecting to the power grid with giant dams, coal or oil-powered plants, or nuclear plants. Jhola Aandolan a mass movement is conducting as fighting against polyethylene carry bags uses and promoting cloth/jute/paper carry bags to protect the environment and nature . Activists in
11050-668: The environmental movement. Countries on the Persian Gulf have high incomes and rely heavily on the large amount of energy resources in the area. Each country in the Arab world has varying combinations of low or high amounts of natural resources and low or high amounts of labor. The League of Arab States has one specialized sub-committee, of 12 standing specialized subcommittees in the Foreign Affairs Ministerial Committees, which deals with Environmental Issues. Countries in
11180-564: The environmentally harmful Carajás iron ore mine. In 1952 the Great London Smog episode killed thousands of people and led the UK to create the first Clean Air Act in 1956. In 1957 the first major nuclear accident occurred in Windscale in northern England. The supertanker Torrey Canyon ran aground off the coast of Cornwall in 1967, causing the first major oil leak that killed marine life along
11310-436: The experience of China, South Korea, Japan and Taiwan reveals that the impact of environmental activism is heavily modified by domestic political context, particularly the level of integration of mass-based protests and policy advocacy NGOs. Hinted by the history of neighboring Japan and South Korea, the possible convergence of NGOs and anti-pollution protests will have significant implications for Chinese environmental politics in
11440-421: The flow of energy through a lake was the primary driver of the ecosystem. Hutchinson's students, brothers Howard T. Odum and Eugene P. Odum , further developed a "systems approach" to the study of ecosystems. This allowed them to study the flow of energy and material through ecological systems. Ecosystems are controlled by both external and internal factors. External factors, also called state factors, control
11570-452: The forests of eastern North America still show legacies of cultivation which ceased in 1850 when large areas were reverted to forests. Another example is the methane production in eastern Siberian lakes that is controlled by organic matter which accumulated during the Pleistocene . Ecosystems continually exchange energy and carbon with the wider environment . Mineral nutrients, on
11700-450: The group focused on public outreach, including through the production of materials for school teachers. The Environmental Society's activities today are an outgrowth of its activities in previous decades, with a continued emphasis on briefing and lobbying governments and on public outreach and education. The SES has placed a particular emphasis on classroom materials and on energy efficiency training, including for building operators. One of
11830-477: The highest per-capita emitters globally, and offering numerous recommendations on areas where the province could take stronger action. SES has also focused on building localized partnerships to advance practical solutions to lowering greenhouse gas emissions. One such solution has been the development of the SES Solar Co-op, which works toward accelerating the adoption of solar power in the province. In May 2020,
11960-691: The landscape, versus one present on an adjacent steep hillside. Other external factors that play an important role in ecosystem functioning include time and potential biota , the organisms that are present in a region and could potentially occupy a particular site. Ecosystems in similar environments that are located in different parts of the world can end up doing things very differently simply because they have different pools of species present. The introduction of non-native species can cause substantial shifts in ecosystem function. Unlike external factors, internal factors in ecosystems not only control ecosystem processes but are also controlled by them. While
12090-423: The living and dead plant matter, and eventually released through respiration. The carbon and energy incorporated into plant tissues (net primary production) is either consumed by animals while the plant is alive, or it remains uneaten when the plant tissue dies and becomes detritus . In terrestrial ecosystems , the vast majority of the net primary production ends up being broken down by decomposers . The remainder
12220-510: The main issues the SES focuses on currently is climate change in Saskatchewan . The group has been highly critical of the province's response to climate change and has produced numerous briefs and press releases to urge stronger legislation. In 2018 SES criticized the provincial government's "Prairie Resilience" climate strategy, arguing that it did not offer nearly enough ambition in reducing greenhouse gas emissions, with Saskatchewan being one of
12350-471: The maintenance of hydrological cycles , cleaning air and water, the maintenance of oxygen in the atmosphere, crop pollination and even things like beauty, inspiration and opportunities for research. Many ecosystems become degraded through human impacts, such as soil loss , air and water pollution , habitat fragmentation , water diversion , fire suppression , and introduced species and invasive species . These threats can lead to abrupt transformation of
12480-408: The maintenance of hydrological cycles, cleaning air and water, the maintenance of oxygen in the atmosphere, crop pollination and even things like beauty, inspiration and opportunities for research. While material from the ecosystem had traditionally been recognized as being the basis for things of economic value, ecosystem services tend to be taken for granted. The Millennium Ecosystem Assessment
12610-685: The mid to late 2010s a coalition of urban and Indigenous communities came together to protect Aarey , a forest located in the suburbs of Mumbai . Farming and indigenous communities have also opposed pollution and clearing caused by mining in states such as Goa , Odisha , and Chhattisgarh . Ecosystem An ecosystem (or ecological system ) is a system that environments and their organisms form through their interaction. The biotic and abiotic components are linked together through nutrient cycles and energy flows. Ecosystems are controlled by external and internal factors . External factors such as climate , parent material which forms
12740-585: The mid-1990s to 52 people per incident in 2004. China has more relaxed environmental laws than other countries in Asia, so many polluting factories have relocated to China, causing pollution in China . Water pollution , water scarcity , soil pollution , soil degradation , and desertification are issues currently in discussion in China. The groundwater table of the North China Plain is dropping by 1.5 m (5 ft) per year. This groundwater table occurs in
12870-617: The movement called for more efficient and professional management of natural resources. They fought for reform because they believed the destruction of forests, fertile soil, minerals, wildlife, and water resources would lead to the downfall of society. The group that has been the most active in recent years is the climate movement . "The conservation of natural resources is the fundamental problem. Unless we solve that problem, it will avail us little to solve all others". Theodore Roosevelt (4 October 1907) The U.S. movement began to take off after World War II , as people began to recognize
13000-564: The movement includes private citizens, professionals, religious devotees , politicians, scientists, nonprofit organizations , and individual advocates like former Wisconsin Senator Gaylord Nelson and Rachel Carson in the 20th century. The origins of the environmental movement lay in response to increasing levels of smoke pollution in the atmosphere during the Industrial Revolution . The emergence of great factories and
13130-431: The movement is centered on ecology , health , as well as human rights . The environmental movement is an international movement, represented by a range of environmental organizations, from enterprises to grassroots and varies from country to country. Due to its large membership, varying and strong beliefs, and occasionally speculative nature, the environmental movement is not always united in its goals. At its broadest,
13260-508: The movement was the Bhopal gas leakage on 3 December 1984. 40 tons of methyl isocyanate was released, immediately killing 2,259 people and ultimately affecting 700,000 citizens. India has a national campaign against Coca-Cola and Pepsi Cola plants due to their practices of drawing groundwater and contaminating fields with sludge. The movement is characterized by local struggles against intensive aquaculture farms. The most influential part of
13390-537: The other hand, are mostly cycled back and forth between plants, animals, microbes and the soil. Most nitrogen enters ecosystems through biological nitrogen fixation , is deposited through precipitation, dust, gases or is applied as fertilizer . Most terrestrial ecosystems are nitrogen-limited in the short term making nitrogen cycling an important control on ecosystem production. Over the long term, phosphorus availability can also be critical. Macronutrients which are required by all plants in large quantities include
13520-509: The other. Despite this, the cumulative effect of additional species in an ecosystem is not linear: additional species may enhance nitrogen retention, for example. However, beyond some level of species richness, additional species may have little additive effect unless they differ substantially from species already present. This is the case for example for exotic species . The addition (or loss) of species that are ecologically similar to those already present in an ecosystem tends to only have
13650-403: The overall structure of an ecosystem and the way things work within it, but are not themselves influenced by the ecosystem. On broad geographic scales, climate is the factor that "most strongly determines ecosystem processes and structure". Climate determines the biome in which the ecosystem is embedded. Rainfall patterns and seasonal temperatures influence photosynthesis and thereby determine
13780-639: The people learned that protesting can bring results. The polluting factories were forced to make immediate improvements to the conditions or pay compensation to victims. Some were even forced to shut down or move locations. The people were able to force the government to come out with new restrictive rules on toxins, industrial waste, and air pollution. All of these new regulations caused the migration of those polluting industries from Taiwan and South Korea to China and other countries in Southeast Asia with more relaxed environmental laws. China's environmental movement
13910-405: The plants in an ecosystem is called the gross primary production (GPP). About half of the gross GPP is respired by plants in order to provide the energy that supports their growth and maintenance. The remainder, that portion of GPP that is not used up by respiration, is known as the net primary production (NPP). Total photosynthesis is limited by a range of environmental factors. These include
14040-423: The possible benefits of GM crops such as water conservation through corn modified to be less "thirsty" and decreased pesticide use through insect – resistant crops. They also point out that some genetically modified livestock have accelerated growth which means there are shorter production cycles which again results in a more efficient use of feed. Besides genetically modified crops and livestock, synthetic biology
14170-598: The preceding decade, more than 1,700 land and environmental defenders were killed, about one every two days. Brazil, Colombia, Philippines, and Mexico were the deadliest countries. Violence and intimidation against environmental activists have also been reported in Central and Eastern Europe . In Romania , anti-logging activists have been killed, while in Belarus , the government arrested several environmental activists and dissolved their organizations. Belarus has also withdrawn from
14300-585: The primary nutrients (which are most limiting as they are used in largest amounts): Nitrogen, phosphorus, potassium. Secondary major nutrients (less often limiting) include: Calcium, magnesium, sulfur. Micronutrients required by all plants in small quantities include boron, chloride, copper, iron, manganese, molybdenum, zinc. Finally, there are also beneficial nutrients which may be required by certain plants or by plants under specific environmental conditions: aluminum, cobalt, iodine, nickel, selenium, silicon, sodium, vanadium. Until modern times, nitrogen fixation
14430-413: The primary producers. The organisms that consume their tissues are called primary consumers or secondary producers — herbivores . Organisms which feed on microbes ( bacteria and fungi ) are termed microbivores . Animals that feed on primary consumers— carnivores —are secondary consumers. Each of these constitutes a trophic level. The sequence of consumption—from plant to herbivore, to carnivore—forms
14560-480: The promotion of the environmental movement was Rachel Carson 's 1962 book Silent Spring about declining bird populations due to DDT , an insecticide, pollutant, and man's attempts to control nature through the use of synthetic substances. Her core message for her readers was to identify the complex and fragile ecosystem and the threats facing the population. In 1958, Carson started to work on her last book, with an idea that nature needs human protection. Her influence
14690-483: The region of China that produces 40% of the country's grain. The Center for Legal Assistance to Pollution Victims works to confront legal issues associated with environmental justice by hearing court cases that expose the narratives of victims of environmental pollution. As China continues domestic economic reforms and integration into global markets, there emerge new linkages between China's domestic environmental degradation and global ecological crisis. Comparing
14820-409: The soil and topography , control the overall structure of an ecosystem but are not themselves influenced by the ecosystem. Internal factors are controlled, for example, by decomposition , root competition, shading, disturbance, succession, and the types of species present. While the resource inputs are generally controlled by external processes, the availability of these resources within the ecosystem
14950-611: The soil, react with mineral soil, or are transported beyond the confines of the ecosystem (and are considered lost to it). Newly shed leaves and newly dead animals have high concentrations of water-soluble components and include sugars , amino acids and mineral nutrients. Leaching is more important in wet environments and less important in dry ones. Fragmentation processes break organic material into smaller pieces, exposing new surfaces for colonization by microbes. Freshly shed leaf litter may be inaccessible due to an outer layer of cuticle or bark , and cell contents are protected by
15080-511: The soil, where plants, fungi, and bacteria compete for it. Some soil bacteria use organic nitrogen-containing compounds as a source of carbon, and release ammonium ions into the soil. This process is known as nitrogen mineralization . Others convert ammonium to nitrite and nitrate ions, a process known as nitrification . Nitric oxide and nitrous oxide are also produced during nitrification. Under nitrogen-rich and oxygen-poor conditions, nitrates and nitrites are converted to nitrogen gas ,
15210-483: The spatial extent of ecosystems using the term " ecotope ". G. Evelyn Hutchinson , a limnologist who was a contemporary of Tansley's, combined Charles Elton 's ideas about trophic ecology with those of Russian geochemist Vladimir Vernadsky . As a result, he suggested that mineral nutrient availability in a lake limited algal production . This would, in turn, limit the abundance of animals that feed on algae. Raymond Lindeman took these ideas further to suggest that
15340-454: The system through photosynthesis , building up plant tissue. Animals play an important role in the movement of matter and energy through the system, by feeding on plants and on one another. They also influence the quantity of plant and microbial biomass present. By breaking down dead organic matter , decomposers release carbon back to the atmosphere and facilitate nutrient cycling by converting nutrients stored in dead biomass back to
15470-421: The transfers of energy and materials from one pool to another. Ecosystem processes are known to "take place at a wide range of scales". Therefore, the correct scale of study depends on the question asked. The term "ecosystem" was first used in 1935 in a publication by British ecologist Arthur Tansley . The term was coined by Arthur Roy Clapham , who came up with the word at Tansley's request. Tansley devised
15600-568: The universe. In 1972, the United Nations Conference on the Human Environment was held in Stockholm , and for the first time united the representatives of multiple governments in discussion relating to the state of the global environment. This conference led directly to the creation of government environmental agencies and the UN Environment Program . By the mid-1970s anti-nuclear activism had moved beyond local protests and politics to gain
15730-508: The use of great crested grebe and kittiwake skins and feathers in fur clothing . The Society attracted growing support from the suburban middle-classes, and influenced the passage of the Sea Birds Preservation Act in 1869 as the first nature protection law in the world. For most of the century from 1850 to 1950, however, the primary environmental cause was the mitigation of air pollution. The Coal Smoke Abatement Society
15860-631: Was adopted. The Kyoto Protocol was created in 1997, setting specific targets and deadlines to reduce global greenhouse gas emissions. The Kyoto Protocol has 192 signatories, including the European Union, Cook Islands, Niue, and all UN member states except Andorra, Canada, South Sudan, and the United States. In the 1990s blockades were held in Germany, the UK, France and the Netherlands to protect forests and other areas from clearing for road construction. In
15990-408: Was advocated by intellectuals such as John Ruskin , William Morris , and Edward Carpenter , who were all against consumerism , pollution and other activities that were harmful to the natural world. The movement was a reaction to the urban conditions of the industrial towns, where sanitation was awful, pollution levels intolerable and housing terribly cramped. Idealists championed the rural life as
16120-546: Was carried out. James Ranald Martin was prominent in promoting this ideology, publishing many medico-topographical reports that demonstrated the scale of damage wrought through large-scale deforestation and desiccation, and lobbying extensively for the institutionalization of forest conservation activities in British India through the establishment of Forest Departments . The Madras Board of Revenue started local conservation efforts in 1842, headed by Alexander Gibson ,
16250-423: Was celebrated on April 22, 1970. Its founder, former Wisconsin Senator Gaylord Nelson , was inspired to create this day of environmental education and awareness after seeing the oil spill off the coast of Santa Barbara in 1969 . Greenpeace was created in 1971 as an organization that believed that political advocacy and legislation were ineffective or inefficient solutions and supported non-violent action. 1980 saw
16380-553: Was created in 1986 and is a wildlife sanctuary program. Pro-Natura International is a private environmental organization created in 1986. From the late 2000s onwards community resistance saw the formerly pro-mining southeastern state of Minas Gerais cancel a number of projects that threatened to destroy forests. In northern Brazil’s Pará state the Movimento dos Trabalhadores Rurais Sem Terra (Landless Workers Movement) and others campaigned and took part in occupations and blockades against
16510-484: Was formed in 1898 making it one of the oldest environmental NGOs. It was founded by artist Sir William Blake Richmond , frustrated with the pall cast by coal smoke. Although there were earlier pieces of legislation, the Public Health Act 1875 required all furnaces and fireplaces to consume their own smoke. Systematic and general efforts on behalf of the environment only began in the late 19th century; it grew out of
16640-414: Was radioactive fallout, smog, food additives, and pesticide use. Carson's main focus was on pesticides, which led her to identify nature as fragile. She believed the use of technology dangerous to humans and other species. Both of these books helped bring the issues into the public eye Rachel Carson's Silent Spring sold over two million copies and is linked to a nationwide ban on DDT and the creation of
16770-679: Was the major source of nitrogen for ecosystems. Nitrogen-fixing bacteria either live symbiotically with plants or live freely in the soil. The energetic cost is high for plants that support nitrogen-fixing symbionts—as much as 25% of gross primary production when measured in controlled conditions. Many members of the legume plant family support nitrogen-fixing symbionts. Some cyanobacteria are also capable of nitrogen fixation. These are phototrophs , which carry out photosynthesis. Like other nitrogen-fixing bacteria, they can either be free-living or have symbiotic relationships with plants. Other sources of nitrogen include acid deposition produced through
16900-470: Was to prevent industrial concentration and encourage manufacturers to set up in the countryside. This led to 20% of the farmland being polluted by industrial waste and 30% of the rice grown on the island was contaminated with heavy metals. Both countries had spontaneous environmental movements drawing participants from different classes. Their demands were linked with issues of employment, occupational health, and agricultural crisis. They were also quite militant;
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