Traveling around the Earth, finding where the sun always shines and where it's rarely seen; finding where water is abundant and where it's scarce.

Touring the mightiest mountain ranges.

The descent of rivers from their mountain sources to the sea.

Exploring caves and their unique habitats.

Around 30% of the land's surface is desert, the most varied of our ecosystems despite the lack of rain. Unravel the secrets of desert survival and experience the ephemeral nature of this dynamic environment. Watch Saharan sandstorms nearly a mile high and desert rivers that run for a single day.In the Gobi Desert, rare Bactrian camels get moisture from the snow. In the Atacama, guanacos survive by licking dew off cactus spines. In the USA, the brief blooming of Death Valley triggers a plague of locusts 65km wide and 160km long. A unique aerial voyage over the Namibian desert reveals elephants on a long trek for food and desert lions searching for wandering oryx.

New science about the dynamics of emperor penguin behavior and aerial images of a polar bear swimming.