Definitions - b

The natural rate of extinction for a species. Contrasts sharply with Mass Extinction.

The average amount of a substance present in the environment. Originally referring to naturally occurring phenomena. Used in toxic substance monitoring.

A pesticide used to control or destroy bacteria, typically in the home, schools, or hospitals.

The Barra system is a passive solar building technology developed by Horazio Barra in Italy. It uses a collector wall to capture solar radiation in the form of heat. It also uses the thermosiphon effect to distribute the warmed air through channels incorporated into the reinforced concrete floors, warming the floors and hence the building. Alternatively, in hot weather, cool nighttime air can be drawn through the floors to chill them in a form of air conditioning.

The average amount of electric power that a utility must supply in any period.

The Basel Convention on the Control of Transboundary Movements of Hazardous Wastes and their Disposal is an international agreement governing the handling of hazardous and other wastes.

Signed by 172 nations, the Convention has been in force since 1992 and makes it illegal to ship hazardous or landfill waste from one country for in another. It does not cover waste designated for recycling, which can be exported for processing abroad.

The emissions that would occur without policy intervention (in a business-as-usual scenario). Baseline estimates are needed to determine the effectiveness of emissions reduction programs (often called mitigation strategies).

In agriculture and gardening, a beneficial organism is any organism that benefits the growing process, including insects, arachnids, other animals, plants, bacteria, fungi, viruses, and nematodes. Benefits include pest control, pollination, and maintenance of soil health. The opposite of beneficial organisms are pests, which are organisms deemed detrimental to the growing process.

A toxic, six-carbon aromatic component of gasoline. A known carcinogen.

A metal hazardous to human health when inhaled as an airborne pollutant. It is discharged by machine shops, ceramic and propellant plants, and foundries.

59.3 percent - the theoretical maximum efficiency at which a wind generator can operate, by slowing the wind down. If the wind generator slows the wind down too much, air piles up in front of the blades and is not used for extracting energy.

Substances that increase in concentration in living organisms as they take in contaminated air, water, or food because the substances are very slowly metabolized or excreted.

A study of a living organism to measure the effect of a substance, factor, or condition.

Biochar is charcoal created by pyrolysis of biomass. The resulting charcoal-like material can be used as a soil improver to create terra preta, and is a form of carbon capture and storage. Charcoal is a stable solid and rich in carbon content, and thus, can be used to lock carbon in the soil. Biochar is of increasing interest because of concerns about mitigation of global warming being caused by emissions of carbon dioxide and other greenhouse gases.

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The accumulation of a chemical in tissues of an organism to levels greater than in the environment in which the organism lives.

Using natural means like predators to control pests, like growing ginger to repel snails and slugs and nasturtiums to ward off aphids, which are also food for ladybugs and lacewing moths. Goldfish placed in water storage containers eat incoming mosquitoes.

Pollutants that are capable of decomposing under natural conditions.

A type of organic farming founded by Rudolf Steiner. It advocates treating a farm or garden as a unified ecological system, the use of mixtures of fermented herbs and minerals as soil additives, and following an astronomical calendar for planting and sowing.

A biofuel produced by the fermentation of plants rich in sugar/starch (e.g. sugar cane, corn).

Population of various microrganisms, trapped in a layer of slime and excretion products, attached to a surface.

Global warming is the name given to the theory that there is increase in the average temperature of the Earth surface air and oceans since the mid-20th century and its projected continuation.

The exact mechanism of warming is not precisely understood, although it is strongly suspected that Greenhouse gases are to blame, as increasing concentrations of such gases help trap heat in the atmosphere and so raise mean temperatures.

Wikipedia Entry

Amount of dissolved oxygen needed by aerobic decomposers to break down the organic materials in a given volume of water at a certain temperature over a specified time period.

a method of controlling pests (including insects, mites, weeds and plant diseases) that relies on predation, parasitism, herbivory, or other natural mechanisms.

Technology that uses bacteria to consume waste/ organic materials.

The cumulative increase in the concentrations of a persistent substance in successively higher levels of the food chain.

Energy produced by combusting biomass materials such as wood. The carbon dioxide emitted from burning biomass will not increase total atmospheric carbon dioxide if this consumption is done on a sustainable basis (i.e., if in a given period of time, regrowth of biomass takes up as much carbon dioxide as is released from biomass combustion). Biomass energy is often suggested as a replacement for fossil fuel combustion.

The action of light on a biological system that results in the dissociation of a substrate, usually water, to produce hydrogen.

The living and non-living components and processes of the ecosphere. Biophysical measurements of nature quantify the ecosphere in physical units such as cubic metres, kilograms or joules.

The business practice of patenting seeds and other indigenously grown agricultural products.

An area comprising a natural ecological community and bounded by natural borders.

A process using organisms to remove or neutralise contaminants (e.g. petrol), mostly in soil or water.

Nutrient-rich organic materials derived from waste water solids (sewage sludge) that have been stabilised through processing.

Bioswales are landscape elements designed to remove silt and pollution from surface runoff water. They consist of a swaled drainage course with gently sloped sides (less than six percent) and filled with vegetation, compost and/or riprap. The water's flow path, along with the wide and shallow ditch, is designed to maximize the time water spends in the swale, which aids the trapping of pollutants and silt. Depending upon the geometry of land available, a bioswale may have a meandering or almost straight channel alignment. Biological factors also contribute to the breakdown of certain pollutants.

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The plant and animal life of a region or area.

Technology that use living organisms to produce products such as medicines, to improve plants or animals, or to produce microorganisms for bioremediation.

Conversion of a substance into other compounds by organisms; including biodegradation.

Bisphenol-a (BPA) is an industrial chemical best known for making polycarbonate plastic and epoxy resins. Found in hard plastic water bottles and baby bottles, in coatings inside metal food and drink cans, and in paints, adhesives, dental sealants, computers, and other products. BPA is an estrogen-mimicking chemical that, in tests on animals, has been shown to interfere with the reproductive system.

A bladder tank is basically a 'bag' made from reinforced PVC tarpaulin to hold water. These are often used under houses or buildings in the sub floor space to store rain water for use with irrigation or general water supply (such as for flushing toilets or washing clothes). Sizes vary from as little as 2000 litres up to 5000 litres

A wood product used for printed and graphically enhanced card stock, books, and packaging such as food cartons, microwave trays, beverages, candy, cosmetics, pharmaceuticals, and consumer electronic items. Pollutants, such as dioxins and furans, can result from processes that use chlorine in the manufacture of bleached board.

In the formulation of food products, the bliss point is the amount of an ingredient such as salt, sugar, or fat which optimizes palatability. 

There are numerous ways to add a layer of insulation between your interior living spaces and the outside world. Blown-in insulation (also called blown-in batt) is composed of loose insulating fibers such as fiberglass, foam, or cellulose. While rolled or batt insulation might leave voids through which air can pass, blown-in types tend to fill all crevices, making it a more energy-efficient choice.

Blown-in insulation is generally installed by a professional.

The amount of a chemical stored in the body at a given time, especially a potential toxin in the body as the result of exposure.

Northern; cold temperate Northern Hemisphere forests that grow where there is a mean annual temperature < 0°C.

Containers meant to receive beverage bottles which people drop off to be recycled.

Boxes of locally grown or organic food and produce, delivered to people's houses.

Mixed fresh and salt water.

A home-built wind generator design by Hugh Piggott of Scotland.

Addition of chlorine to water until there is enough chlorine present for disinfection of water.

Obsolete electronic products, such as radios and televisions.

A brown search refers to the act of looking for information on recycling and sustainability on the internet. Most 'green' search engines are also able to perform this function as they will index such sites (as the EcoWho search engine does).

A plant cultivated for its triangular grains, which are protected by a hull. This crop is generally grown without herbicides and pesticides.

Building Orientation refers to positioning of a property or building with respect to the Sun, usually done to maximize solar gain at the appropriate time of year when required. This is to reduce heating costs and improve quality of living in the property concerned.

Also called building felt or housewrap; used in the construction of frame houses to block drafts and moisture. Building paper is applied in layers over a house’s walls and sheathing, with the top courses overlapping the bottom courses so that water drains off the wall.

Serious and diagnosable health conditions, usually of the respiratory system, that can be attributed to specific air quality problems within a building.

The accidental harvest of one organism instead of another, such as crustaceans caught in shrimp trawls and dolphins trapped instead of tuna.