Throughout its history, Earth has continuously fluctuated between "greenhouse" and "icehouse." An icehouse phase known as "Snowball Earth" is the most extreme period of cold our planet has ever witnessed, with ice encasing Earth from the poles to the equator. Somehow, new life manages to survive.

In the Triassic period, dinosaurs rise to dominate our planet for 150 million years. 66 million years ago, the dinosaurs vanish—along with 75% of all species. Did an asteroid cause the last mass extinction? Experts are using the latest scientific methods to discover what killed the dinosaurs.

Shortly after humans appear, they become the dominant species on Earth, but face threats from both above and below—including super volcanic eruptions and falling asteroids. Today, scientists around the world use the latest technology to mitigate future catastrophes.