Environmental Science
Without the atmospheric greenhouse effect, the average surface temperature would be:

Higher than at present
Much more variable than it is now
The same as it is now
Lower than at present

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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
Circulation of heat by the atmosphere and oceans
Release of latent heat to the atmosphere when polar ice melts
Conduction of heat through the interior of the earth
The insulating properties of snow

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