Environmental Science
The most important reason why summers in the Southern Hemisphere are not warmer than summers in the Northern Hemisphere is that:

Over 80% of the Southern Hemisphere is covered with water
The sun's energy is less intense in the Southern Hemisphere
The earth is closer to the sun in January
The earth is farther from the sun in July

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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:

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

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