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gas molecules absorb some of the heat radiating from the ground (see infrared radiation), so that it all doesn't escape into outer space
{{merge|greenhouse gas}}
{{merge|greenhouse gas}}
The '''greenhouse effect''' refers to the retention of heat by a planet's [[atmosphere]] which results when gas molecules reduce the escape of [[infrared radiation]] into [[outer space]]. It was discovered in 1824 by [[Joseph Fourier]].
The '''greenhouse effect''' refers to the retention of heat by a planet's [[atmosphere]].
It happens because gas molecules absorb some of the heat radiating from the ground (see [[infrared radiation]]), so that it all doesn't escape into [[outer space]]. It was discovered in 1824 by [[Joseph Fourier]].
The effect has been compared to that of the glass roof and walls of a [[greenhouse]], although the process is different. A gardener's greenhouse simply traps warm air inside the building.
The effect has been compared to that of the glass roof and walls of a [[greenhouse]], although the process is different. A gardener's greenhouse simply traps warm air inside the building.