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

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

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Environmental Science
At night, low clouds:

Are often caused by the atmospheric greenhouse effect
Weaken the atmospheric greenhouse effect
Have no effect on the atmospheric greenhouse effect
Enhance the atmospheric greenhouse effect

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