ICYMI: Earth’s sea ice reached a new low in 2025. 🌊🧊 Every year, sea ice cover in the Arctic grows in the dark and cold of the Northern Hemisphere winter, reaching its annual peak. Arctic sea ice hit its peak on March 22, 2025 at 5.53 million square miles (14.33 million square kilometers), making it the lowest annual peak on record. In the Antarctic, sea ice melts during the Southern Hemisphere summer to its annual minimum extent. This year, Antarctic sea ice retreated to 764,000 square miles