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.
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).
A growth layer produced by a tree in a single growth year.
A comprehensive term for non-volatile viscous plant exudates, which either dissolve or swell up in contact with water.