A federal agency will extend the comment period on its proposal to list two ice-dependent seals as threatened because of climate warming. Julie Speegle of the National Marine Fisheries Service says the state of Alaska and representatives of the petroleum industry requested the extension. The agency in December proposed listing ringed seals, the main prey of polar bears, as threatened because of projected sea ice loss and reduced snow cover. The original 60-day comment period would have ended Tuesday. The public will have an additional 45 days to comment.
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