The world’s largest sockeye salmon run passes through Alaska’s Bristol Bay, where an expected 72 million sockeye will return this summer. This thriving and productive fishery is threatened, however, by the proposed Pebble Mine, a massive, open-pit gold and copper mine situated directly upstream from Bristol Bay. In late May, the EPA announced a rule under the Clean Water Act to prohibit discharges of toxic waste from mining the Pebble deposit into the Bristol Bay watershed, marking a potential veto…