Environmental Science
Although the polar regions radiate away more heat energy than they receive by insolation in the course of a year, they are prevented from becoming progressively colder each year by the:

Release of latent heat to the atmosphere when polar ice melts
The insulating properties of snow
Circulation of heat by the atmosphere and oceans
Concentration of earth's magnetic field lines at the poles
Conduction of heat through the interior of the earth

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Environmental Science
The atmospheric greenhouse effect is produced mainly by the:

Absorption and re-emission of visible light by the ground
Absorption and re-emission of infrared radiation by the atmosphere
Absorption and re-emission of visible light by clouds
Absorption and re-emission of visible light by the atmosphere
Absorption and re-emission of ultraviolet radiation by the atmosphere

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