Around 10,000 years ago, the Arctic region was a warm forest rather than the icy landscape we see today. Geologists have discovered numerous fossilized trees in northern Canada, species that now only grow in northern China. In Siberia, scientists found a well-preserved mammoth carcass, which contradicts the cold climate of that time, raising many questions about prehistoric climate change. With the advancement of modern freezing technology, these questions have become even more complex. Archaeological evidence shows that temperatures in Siberia underwent a dramatic shift 11,000 years ago, leading to the burial of many animal and human remains beneath layers of ice. These findings reveal a mysterious and challenging era.