Scientists have uncovered evidence that the protective magnetic shield around the Earth could be fading. Are our planet's magnetic poles on the verge of flipping?
Grizzlies, wolves, and moose roam this terrain just 200 miles (320 kilometers) from the Arctic Circle, but it is the altitude here that defines which wild conditions—and creatures—dominate.
How did Earth evolve to support life, which requires very special living conditions to survive? An imaginary time traveler takes us on a journey back to the moment our solar system was born.
Create a short film or PSA and enter the National Geographic Channel's first annual Preserve Our Planet Film and PSA Contest. You could win $5,000 and meet top National Geographic explorers!