This threat is called Melting Permafrost. This video can help you understand why melting Permafrost is such an enormous problem: https://www.youtube.com/watch?v=XpqZTqIKMxsWhy is Melting Permafrost such a huge problem? When Permafrost melts, all of this locked up carbon dioxide and methane gets released into the atmosphere. The melting Permafrost releases more carbon dioxide and methane that has been locked up in the Permafrost. As more and more Permafrost melts, the planet gets hotter and hotter.

Source: New York Times October 27, 2023 12:09 UTC