permafrost

Imagine the ground beneath your feet staying frozen for at least two years straight, even in summer. That's what this word means. It is not just surface ice, but a layer of soil, rock, and plant material that stays at or below 0°C (32°F) for a very long time. You find it in places like Alaska, Canada, Russia, and Greenland, where the climate is very cold.

It acts like a giant freezer, preserving ancient plants, animals, and even tiny living things from long ago. But as the climate warms, it is starting to thaw, releasing greenhouse gases and changing the land. You can think of it as nature's deep freeze, slowly starting to melt.

Permafrost, from "permanent" and "frost," is ground that stays at or below freezing for at least two years in a row. It is not just a sheet of surface ice. It can be a mix of soil, rock, sand, gravel, and organic matter, often held together with ice. While many people picture Antarctica, it is found across large parts of the Northern Hemisphere, including Alaska, Canada, Siberia, and parts of China.

For thousands of years, it has been a stable part of these landscapes, supporting ecosystems and serving as a base for human settlements. Indigenous communities have lived with it for generations, building homes and travel routes in ways that work with the frozen ground.

However, with rising global temperatures, it is thawing faster. This thaw can release trapped carbon dioxide and methane, both greenhouse gases that add to climate change. Thawing ground can also become unstable, leading to landslides, sinkholes, and damage to buildings, roads, and pipelines, while also changing rivers and wetlands. Scientists study it closely because what happens to it affects climate, landscapes, and daily life in cold regions.

So, while it may seem like a faraway Arctic issue, its thaw has global effects. It influences climate change, infrastructure, and ecosystems, and it may even expose ancient microbes. It is a frozen world undergoing rapid change, with effects we are still trying to understand.