In a remote corner of North America, salmon and mining companies are vying for new territory.

The Tulsequah Glacier meanders down a broad valley in northwest British Columbia, 7 miles from the Alaska border. At the foot of the glacier sits a silty, gray lake, a reservoir of glacial runoff. The lake is vast, deeper than Seattle’s Space Needle is tall. But it didn’t exist a few decades ago, before 2 miles of ice had melted.

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