The New York Times has created a visualization showing how marine heat waves have intensified since 2000. Using NOAA satellite data, the graphic highlights the monthly share of the global ocean surface experiencing extreme heat, defined as sea-surface temperatures above the 90th percentile of historical norms. The map displays affected regions in orange, with May 2025 showing nearly 24 percent of ocean surface in a heat wave.
Mapping Warming Ocean Temperatures
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