#environmental

• Activism — A doctrine, attitude, or social and political behavior characterized by dynamic, direct, and militant involvement in public life, aiming to produce structural changes, reforms, or to defend specific rights, humanitarian, or ecological causes. In philosophy, it represents a theory that places human action and will above theoretical contemplation.
• Aerobiology — An interdisciplinary branch of biology that deals with the study of living organisms and particles of biological origin (such as bacteria, fungi, pollen, spores, cysts, and viruses) passively transported through the air, as well as with the analysis of their movement, survival, and impact on the environment and human health.
• Air filter — A technical device or industrial installation designed to retain impurities, dust, pollen, or other suspended particles in the air, ensuring the purification of the gas stream before it enters a room or an internal combustion engine. In ecology, the term also applies to biological systems for natural atmospheric filtration.
• Aerophytobionts — A scientific term used to designate the assembly of plant organisms (microscopic algae, lichens, mosses) that live and carry out their life cycle exclusively in the aerial environment, on the terrestrial surface, on tree bark, or on other substrates directly exposed to the atmosphere, without structural connection to aquatic or subterranean environments.
• Aeropalynology — A branch of palynology that studies spores, pollen grains, and other microparticles of plant or fungal origin suspended in Earth's atmosphere and transported by air currents. This discipline has major importance in establishing pollen calendars, monitoring air quality, and diagnosing respiratory allergies or seasonal rhinitis.
• Aeroscopy — A scientific method, technique, or laboratory investigation consisting of the examination, observation, and analysis of the physical, biological properties, or impurities of atmospheric air through optical devices. This structural discipline enables the identification of microparticles, bacteria, and pollutant compounds suspended in the lower layers of the troposphere, providing essential data for applied meteorology and public hygiene.
• Aerosol — A heterogeneous macromolecular disperse system formed by a collection of fine particles, solid or liquid, stably suspended within a gaseous medium (such as atmospheric air). In a medical or industrial sense, the term designates either natural phenomena like fog and smoke, or pharmaceutical preparations sprayed under pressure for therapeutic inhalation directly into the airways.
• Aeration tank — A large basin, reservoir, or industrial technical installation used in wastewater treatment plants for their aerobic biological treatment. Its structural operation relies on the continuous and forced insufflation of air (oxygenation) into the liquid mass, a process that stimulates the growth of microorganisms in the active sludge which decompose polluting organic substances.
• Aeroterrestrial — Belonging or relating simultaneously to the air and the earth, or performing its specific activity or phenomena within both the aerial and terrestrial environments. In biology, it describes a complex biotope or species relying on soil for shelter and the atmosphere for respiration or movement. In logistics, it applies to mixed transport systems combining air and road routes.
• Aerotropism — A specific form of tropism or oriented growth movement of plant vegetative organs, such as roots or mycelial filaments, determined by the presence of air or the variation of oxygen concentration in the surrounding environment. This structural phenomenon allows plants to guide their roots toward well-aerated soil layers or to develop respiratory structures above water.
• Agroecology — A scientific discipline that studies ecological processes applied to agricultural production systems, integrating principles from ecology, agronomy, and social sciences. This field promotes the sustainable management of agroecosystems by optimizing interactions between plants, animals, humans, and the environment, offering viable alternatives to intensive industrial agriculture.
• Alkalinity — The property of being alkaline; the total concentration of basic substances in a solution capable of neutralizing hydrogen ions. In hydrology and ecology, it represents the buffering capacity of water against acidification, primarily determined by the presence of carbonate, bicarbonate, and hydroxide ions.
• Aldrin — A surname of Germanic or Anglo-Saxon origin, famous due to the American astronaut Buzz Aldrin (b. 1930), the second man to walk on the Moon during the Apollo 11 mission. In the chemical industry and ecotoxicology, the lowercase term (aldrin) designates a highly toxic organochlorine insecticide, banned globally under the Stockholm Convention due to its heavy structural persistence in the environment.
• Ruderal plants — A specialized term used in botany and ecology to designate ruderal plants, weeds, or pioneer vegetal species that grow on degraded lands, roadsides, debris, or anthropized soils deeply modified by human activity. These organisms exhibit outstanding resilience and the ability to rapidly colonize unstable habitats.
• Allobiosis — A physiological state or form of existence of a living organism characterized by adaptation or reaction to an artificially modified, unnatural environment or one completely different from its native one. In experimental ecology, the term describes the structural response of tissues or cellular communities when forced to survive under non-standard biochemical parameters, demonstrating the metabolic plasticity of the system.
• Allochory — A phenomenon or modality of seed, spore, or fruit dispersal through external factors or vectors that are independent of the plant's own biological mechanisms (such as wind, water, animals, or human activity). This structural mechanism ensures the colonization of new geographical habitats and prevents intraspecific competition near the parent plant.
• Ambient — Surrounding a person, object, or organism on all sides; pertaining to the immediate environment or atmosphere. In physics and meteorology, it qualifies parameters like air temperature or pressure of the surrounding space. Sociologically, it describes a cultural or social mood.
• Environmental — Pertaining to the ambient or environment; structurally created to harmoniously integrate into a certain space or to generate a comfortable and relaxing atmosphere. In ecology, it defines external factors. In music, it describes discrete background compositions.
• To threaten — To utter a threat against someone, to express the intention to cause harm, to punish, or to inflict damage with the purpose of intimidating or coercing. In a broad sense, the action describes an imminent danger, a state of vulnerability, or a natural or social risk factor that jeopardizes the safety, integrity, or existence of a person, an object, or an ecological species.
• Amensalism — A form of asymmetric interspecific ecological interaction in which one population or biological species is systematically inhibited, harmed, or destroyed by the presence or metabolic activity of another species, without the latter gaining any direct benefit or suffering any harm. A classic structural example is antibiosis, where antibiotics secreted by a mold destroy surrounding bacteria without a direct metabolic impact on the fungi.