Antarctica's sea ice has been declining since 2015. (Image credit: Patrick J. Endres via Getty Images)
Antarctic waters are becoming saltier, causing sea ice to break up, and scientists aren't exactly sure why.
Antarctic sea ice extent has been declining since 2015, defying forecasts that it would reach a record 0.6 million square miles (1.55 million square kilometers) by 2023, below the expected average. At the height of winter in July that year, there was no ice in the area larger than Western Europe, and there are no signs of recovery.
This reduction represents the most significant environmental change on Earth in decades, which will affect the planet's climate.
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