(AP) The Interior Department declared the polar bear a threatened species Wednesday, saying it must be protected because of the decline in Arctic sea ice from global warming.

Interior Secretary Dirk Kempthorne cited dramatic declines in sea ice over the last three decades and projections of continued losses. These declines, he told a news conference, mean the polar bear is a species likely to be in danger of extinction in the near future.

Kempthorne also said, though, that it would be "inappropriate" to use the protection of the bear to reduce greenhouse gases, or to broadly address climate change.

Reflecting views recently expressed by President Bush, Kempthorne said the Endangered Species Act was "never meant to regulate global climate change."

He said the decision to list the bear includes administrative actions aimed at limiting the impact of the decision on energy development and other climate related activities.

"This listing will not stop global climate change or prevent any sea ice from melting," said Kempthorne. He said he had consulted with the White House on the decision, but "at no time was there ever a suggestion that this was not my decision."

Kempthorne cited as support for his decision conclusions by the department's scientists that sea ice loss will likely result in two-thirds of the polar bears disappearing by mid-century.

Notwithstanding the secretary's disclaimers, this is the first time the Endangered Species Act has been used to protect a species threatened by the impacts of global warming. There has been concern within the business community that such an action could have far-reaching impact and could be used to regulate carbon dioxide.

Kempthorne proposed 15 months ago to investigate whether the polar bear should be declared threatened under the Endangered Species Act.

That triggered a year of studies into the threats facing the bear and its survival prospects at a time when scientists predict a continuing warming and loss of Arctic sea ice. The Arctic sea ice serves as a primary habitat for the bear and is critical to its survival, scientists say.

"The science is absolutely clear that polar bear needs protection under the Endangered Species Act," said Andrew Wetzler, director of the endangered species program at the Natural Resources Defense Council.

A decision had been expected early this year, but the Interior Department said it needed more time to work out many of the details, prompting criticism from members of Congress and environmentalists. Environmentalists filed a lawsuit aimed at forcing a decision and a federal court on April 29 set a May 15 deadline for a decision.

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