greenhouse effect

[ green-hous i-fekt ]

noun

1. Often the greenhouse effect. a phenomenon in which carbon dioxide, water vapor, methane, and other gases in a planet's atmosphere absorb infrared radiation from the sun and reradiate it through the atmosphere, heating the planet: increased levels of carbon dioxide and other gases cause more of this heating radiation to be trapped on the planet and circulated through the atmosphere, contributing to a corresponding increase in the planet's overall temperature. greenhouse gas ( def ).

greenhouse effect

noun

1. an effect occurring in greenhouses, etc, in which radiant heat from the sun passes through the glass warming the contents, the radiant heat from inside being trapped by the glass
2. the application of this effect to a planet's atmosphere; carbon dioxide and some other gases in the planet's atmosphere can absorb the infrared radiation emitted by the planet's surface as a result of exposure to solar radiation, thus increasing the mean temperature of the planet

greenhouse effect

/ grēn′hous′ /

1. The retention of part of the Sun's energy in the Earth's atmosphere in the form of heat as a result of the presence of greenhouse gases. Solar energy, mostly in the form of short-wavelength visible radiation, penetrates the atmosphere and is absorbed by the Earth's surface. The heated surface then radiates some of that energy into the atmosphere in the form of longer-wavelength infrared radiation. Although some of this radiation escapes into space, much of it is absorbed by greenhouse gases in the lower atmosphere, which in turn re-radiate a portion back to the Earth's surface. The atmosphere thus acts in a manner roughly analagous to the glass in a greenhouse, which allows sunlight to penetrate and warm the plants and soil but which traps most of the resulting heat energy inside. The greenhouse effect is essential to life on Earth; however, the intensification of its effect due to increased levels of greenhouse gases in the atmosphere is considered to be the main contributing factor to global warming .

greenhouse effect

1. A term used to describe the heating of the atmosphere owing to the presence of carbon dioxide and other gas es. Without the presence of these gases, heat from the sun would return to space in the form of infrared radiation . Carbon dioxide and other gases absorb some of this radiation and prevent its release, thereby warming the Earth . This is an effect analogous to what happens in a greenhouse, where glass traps the infrared radiation and warms the air.

Notes

The burning of fossil fuels adds carbon dioxide to the atmosphere, and therefore places the Earth at risk from an increase of this effect.

Word History and Origins

Origin of greenhouse effect¹

First recorded in 1935–40

Example Sentences

For example, methane is of particular relevance to the global greenhouse effect because its warming potential is 25 times higher than that of carbon dioxide.

From Science Daily

This buries organic carbon, which would otherwise contribute to ocean acidification and the greenhouse effect.

From Science Daily

One theory holds that, eons ago, several apocalyptic eruptions set off a runaway greenhouse effect on Venus, turning it from a temperate, waterlogged world into an arid desert of burned glass.

From New York Times

When carbon dioxideenters the atmosphere, it contributes to warming of the climate due to the greenhouse effect.

From Science Daily

Clouds of carbon dioxide in Venus' atmosphere kicked off the most powerful greenhouse effect in the solar system, eventually raising temperatures at the surface to a roasting 900 degrees Fahrenheit.

From Science Daily

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