"Proposing critical habitat for this iconic species is one step in the right direction to help this species stave off extinction, recognizing that the greatest threat to the polar bear is the melting of Arctic sea ice caused by climate change," Interior Assistant Secretary for Fish, Wildlife and Parks Tom Strickland said in a statement announcing the move.

The habitat would cover 200,541 square miles (519,399 square kilometeters) and include barrier islands along Alaska's coast, sea ice habitat, land and rivers near the coast where the bears make their dens.

The United States listed the polar bear as a threatened species in May last year, saying climate change has caused a drastic loss of Arctic sea-ice, which is essential for the survival of the bears.

But although the Endangered Species Act calls for a critical habitat to be designated at the same time as a species is declared threatened, wildlife officials under the previous administration of president George W. Bush held off on naming the habitat area.

The Bush administration also pushed forward with the sale of offshore exploration leases in parts of Alaska where polar bears dwell, insisting that developing oil activities in Alaska would not harm the bears.

By contrast, Strickland said the administration of President Barack Obama "is fully committed to the protection and recovery of the polar bear."

But the designated critical habitat for the bears would include "areas where oil and gas exploration activities are known to occur," according to the Fish and Wildlife Services, the branch of the Department of the Interior in charge of nature conservancy.

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