A fascinating look at the way we cope with extreme environments

A globetrotting series visits some of the most extraordinary places on our planet to see how the people who live in them survive.

It begins in the Himalayas with a hardy group of yak herders who need to move their 200-strong herd 27 miles down a treacherous mountain trail.

From there we join fearless Mimi and granddaughter in the Canadian Arctic, where Mimi climbs down under the sea ice to find mussels to feed her family.

We also meet firefighters in the Amazon rainforest, Australian outback cowboys who round up their cattle with helicopters, and intrepid mammoth-tusk hunters in the vast Siberian Tundra.