How Otters Are Saving Earth’s Underwater Forests

There is a surprising natural wonder in the middle of the vast West Texas desert: a prehistoric ocean reef built from the remains of ancient sea life. This fossil-rich landscape tells the story of Earth's most devastating mass extinction—and can help enlighten the climate threats we face today.

In the 1990s, an entire city in the Caribbean vanished under ash. Plymouth, Montserrat, once vibrant, now lies frozen in time—buried by a volcano still simmering beneath the surface. We explore how this community has endured, and how scientists are racing to uncover the volcano’s secrets before it erupts again.

In the southern part of Mexico City lies Xochimilco, a maze of canals filled with boats, music, food and tourists. It’s also one of the last remnants of the interconnected lakes that once surrounded Tenochtitlan, the ancient capital of the Aztecs. And within these canals lies the last remaining wild habitat of a strange, smiling salamander called the axolotl.