A proposed mine in Alaska will endanger brown bears – and much more

The world's most productive salmon fishery and a stronghold for the state's bears are under threat from an open-pit gold and copper mine

Towering over the average human and weighing as much as a grand piano, the bears found in south-west Alaska are considered among the best in the world to observe as they pad around in a largely untouched wilderness of soaring mountains, pristine rivers and rocky beaches.

About a third of Alaska's 30,000 brown bears are found on the Alaska Peninsula, which separates the Pacific Ocean from Bristol Bay, a place that hosts the most productive wild salmon fishery in the world and draws large numbers of bears to catch their food in the tumbling waters once they emerge from their winter hibernation.