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greenhouse effect

The effect produced as greenhouse gases allow incoming solar radiation to pass through the earth's atmosphere, but prevent part of the outgoing infrared radiation from the earth's surface and lower atmosphere from escaping into outer space. This process occurs naturally and has kept the earth's temperature about 59 degrees Fahrenheit (15 degrees Celsius) warmer than it would otherwise be. Current life on earth could not be sustained without the natural greenhouse effect.

Synonyms - global warming
greenhouse gases

Those gaseous constituents of the atmosphere both natural anthropogenic, that absorb and re-emit infrared radiation. The major GHGs are carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O). Less prevalent – but very powerful – greenhouse gases are hydrofluorocarbons (HFCs), perfluorocarbons (PFCs) and sulphur hexafluoride (SF6).

gross output

The actual market value of minerals or mineral products from its mining area as defined in the National Internal Revenue Code.

ground water

Water in the ground that is in the zone of saturation, from which wells, springs and ground water and runoff are supplied.

growing stock

An area with significant habitat and species values where management practices are required periodically to maintain specific non-climax habitat types or conditions required by rare, threatened or endangered species.

growth ring

A growth layer produced by a tree in a single growth year.

gum

A comprehensive term for non-volatile viscous plant exudates, which either dissolve or swell up in contact with water.