The Northern Hemisphere, because it has twice as much land mass as the Southern Hemisphere, has greater influence on the Earth’s climate and temperatures.
About 40% of the surface of the Northern Hemisphere is landmass, with about 60% covered by water. The Southern Hemisphere, by comparison, is about 20% landmass and covered by about 80% water.
So when more of the Northern Hemisphere’s land is covered with snow, more sunlight is reflected, cooling the planet.
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