What caused Antarctica’s climate to change from a more temperate climate to its current climate?

Antarctica’s climate became much colder as tectonic plates moved it toward the South Pole, where it receives less direct sunlight. The movement also helped isolate Antarctica from warmer regions. Being surrounded by ocean is part of its present setting, but it did not alone cause the long-term shift from a temperate climate; El Niño is a temporary climate pattern. The best answer is movement of tectonic plates.

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