Marine heatwave
AssessTechniques
A prolonged period of unusually warm ocean temperatures in a specific region.
Why it's here
Placed in Assess: 1 article(s) of evidence from 1 source(s), led by research-stage coverage, with 0 in the last 30 days. Confidence 24%. Low accumulated evidence, so it defaults conservatively pending more signal.
Evidence (1)
- 9Hacker News·8/24/2026researchOceans reach record-high surface temperatures
New Copernicus data indicate that the world's oceans outside the polar regions have reached their highest recorded average surface temperature, driven by long-term human-caused warming and a strengthening El Niño. Scientists warn this could intensify extreme weather, raise sea levels, and further stress marine ecosystems.