As Earth's climate warms, glaciers are retreating. This is evident all around the world.
Glacial retreat isn't always a peaceful process and can significantly affect the landscape. Our fleet of Earth-observing satellites bears witness to these changes.
In 2025, the retreating South Sawyer Glacier in Alaska's Tracy Arm, a fjord near Juneau, triggered a large landslide.
As debris from the landslide smashed into the water, it triggered a megatsunami that swept down the fjord into the ocean.
On its way down, it reached a maximum height of 481 m (1,578 ft) – the second-highest tsunami known to humans.
