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Definition

greenhouse effect

The Greenhouse effect is the warming effect of the sun on greenhouse gases like CO2 that act to trap this heat in our atmosphere.

Greenhouse gases in the earth’s atmosphere release heat absorbed from the sun's infrared radiation (IR). Some of the heat released reaches the earth, along with heat from the sun that has penetrated the atmosphere. Both the solar heat and the radiated heat are absorbed by the earth and released; some is reabsorbed by greenhouse gases to perpetuate the cycle. The more of these gases that exists, the more heat is prevented from escaping into space and, consequently, the more the earth heats. 

Some degree of greenhouse gases in our environment is only natural -- without the greenhouse effect our ecosystem would not be possible. Since the dawn of the industrial age in the 1750s, however, carbon dioxide alone has increased by 40%. Concerns about the greenhouse effect's contribution to global warming have prompted agreements between various governments on targets for reduction of greenhouse gas emissions.

While the same principle technically applies to an actual greenhouse, the effect is a small contributor to the structure’s total heat when compared with its prevention of heat loss through convection. In contrast, it is estimated that the greenhouse effect, both natural and man-made, raise the average temperature of the earth by thirty-three degrees Celsius.

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This was last updated in May 2019

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