'There's nowhere like it': Alaska's wildlife refuge fears death by drilling

The Trump administration plans to allow oil and gas exploration in the Arctic sanctuary protected since the 1950s as the last fully intact ecosystem in the US

Biologist George Schaller has traversed the Amazon rainforest, studied lions in the Serengeti and searched for rare antelope in Tibet, but for him nothing quite compares to a vast and little-known wilderness found in the north-eastern reaches of Alaska.

Schaller first encountered the region in the 1950s, taking a canoe down the Colville River, a waterway that drains into the Arctic Ocean, and trudging across the bumpy tundra to excitedly document the astonishing trove of wildlife found in the last fully intact ecosystem left in the United States.