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:

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

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Environmental Science
The primary cause of a radiation inversion is:

Solar radiation absorbed by the earth's surface
Infrared radiation absorbed by the atmosphere and clouds
Solar radiation reflected by the earth's surface
Infrared radiation absorbed by the earth's surface
Infrared radiation emitted by the earth's surface

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