Reuters: The waters off Alaska, teeming with enough fish to support more than half the U.S. commercial seafood catch, face a new threat — increasing acidification from the same atmospheric carbon linked to global warming. Although nobody knows for sure what the effects of higher acidity levels will be, reports of smaller salmon catches are worrying scientists and cast a pall over the state’s $3.6 billion fishing industry. “These waters are becoming corrosive and harmful to marine …