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Activated sludge
Activated sludge is a process in sewage treatment in which air or oxygen is forced into sewage liquor to develop a biological floc which reduces the organic content of the ... > more -
Rachel Carson
Rachel Louise Carson (May 27, 1907 - April 14, 1964) was a Pittsburgh, Pennsylvania-born zoologist and biologist whose landmark book, Silent Spring, is often credited with having launched the global ... > more -
Ozone depletion
Ozone depletion describes the observed loss of ozone in the stratosphere over the past 50 years. It encompasses both a steady thinning of the ozone layer at mid-latitudes and its catastrophic ... > more -
Deforestation
Deforestation is the conversion of forested areas to non-forest land use such as arable land, urban use, logged area or wasteland. Historically, this meant conversion to grassland or to its ... > more -
Fertilizer
Fertilizers or fertilisers are compounds given to plants with the intention of promoting growth; they are usually applied either via the soil, for uptake by plant roots, or by foliar spraying, for ... > more -
Wildland fire suppression
Wildland fire suppression is a unique aspect of firefighting. Wildland firefighting requires different tactics, equipment, and training from the normal structure fire fighting found in populated ... > more -
Civil engineering
In modern usage, civil engineering is a broad field of engineering that deals with the planning, construction, and maintenance of fixed structures, or public works, as they are related to earth, ... > more -
Air conditioning
An air conditioner (AC or air-con) is an appliance or mechanism designed to extract heat from an area using a refrigeration cycle. In construction, a complete system of heating, ventilation and air ... > more
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