Argentina’s Perito Moreno Glacier, once known for its unusual stability, experienced a dramatic calving event on April 21, 2025, when a massive block of ice collapsed into Lake Argentino.

Scientists are now raising concerns about the glacier's shifting behavior amid broader global climate changes. This glacier, located in the UNESCO-listed Los Glaciares National Park, is now showing signs of accelerated mass loss.

Key Points:

• A huge chunk of ice, as tall as a 20-storey building, broke off from the Perito Moreno Glacier on April 21, 2025, in a spectacular display.
• Perito Moreno had long been considered stable, unlike many other glaciers worldwide that have been retreating due to global warming.
• Recent studies, including a 2024 Argentine government-backed report, show the glacier has been losing mass at the fastest and longest rate in nearly five decades.
• Scientists note that the glacier’s retreat has accelerated since 2020, averaging a 0.85-meter loss in ice depth each year.
• While the glacier remains a major tourist attraction, the increasing size and frequency of calving events now serve as warning signs of climate-driven changes in the region.