Oceans warming twice as fast, hit record heat in 2025

Oceans are warming twice as fast as two decades ago, absorbing 23 zettajoules of heat in 2025 alone — a ninth consecutive record, per the Copernicus Ocean State Report. Sea levels rise 3.8mm yearly, acidity up 17% since 1985, Arctic losing 190,000 sq miles of ice per decade. Coastal and island communities face growing risks.