From 1940 to 2025, sea surface temperature compared to the 1991-2020 average. Blue, cooler. Red, warmer. One frame per year.

The map is a Spilhaus projection: it cuts the planet through the continents instead of through the ocean, so you see in one piece what we always treat as four separate oceans. It's one.

The sea has absorbed close to 90% of the excess heat from global warming. This animation is that bill, year by year.

Data: ERA5, Copernicus Climate Change Service (C3S)