A record in the ocean
The daily global sea surface temperature has reached its highest level since records began, according to the Copernicus Climate Change Service. The agency tracks ocean heat using satellite data going back decades, and its records now show a new high across most of the world's oceans.
The new record comes as El Nino conditions in the Pacific help supercharge warming. El Nino releases heat stored in the deep ocean, pushing surface temperatures higher. Climate change adds more heat on top of that natural cycle, and the combination has pushed ocean temperatures past previous peaks.
Why warm oceans matter
Warmer oceans do more than raise beach temperatures. They add energy to storms, making hurricanes and typhoons stronger and wetter. They also cause seawater to expand, which speeds up sea level rise and raises the risk of coastal flooding in low-lying cities.
Heat in the ocean also harms marine life. Corals bleach when water stays too warm for too long, and large reef systems have already suffered repeated bleaching events. Fish move toward cooler waters, which disrupts fishing communities and the food chains that depend on them.
What comes next
Researchers are watching whether the record holds through the rest of the year. El Nino is expected to weaken, which could ease some of the pressure. But the long-term trend is clear: ocean temperatures keep climbing as greenhouse gas emissions continue, and each new record becomes the baseline for the next.
Climate scientists say cutting emissions is the only way to slow ocean warming. Every fraction of a degree matters for marine ecosystems and coastal cities, and the ocean absorbs most of the extra heat trapped by greenhouse gases. The new record adds urgency to those calls from governments and businesses around the world, and it gives negotiators fresh evidence as they prepare for the next round of climate talks.