"The science is perfectly clear. There's no dispute. The polar bear is an endangered species," she said.

In response to the petition filed in 2005, the Fish and Wildlife Service proposed in December 2006 that polar bears be listed as threatened under the Endangered Species Act because of the loss of their primary habitat, Arctic sea ice.

Summer sea ice shrank last year to a record low, about 1.65 million square miles in September, nearly 40 percent less ice than the long-term average between 1979 and 2000. Some climate models have predicted the Arctic will be free of summer sea ice by 2030. A U.S. Geological Survey study generated in response to the listing petition predicted polar bears in Alaska could be wiped out by 2050.

A decision on the proposed listing was due Jan. 9, but Fish and Wildlife Service Director Dale Hall said in January that a delay was needed to make sure it came in a form easily understood. He promised a decision within a month, but that deadline also passed and the Center for Biological Diversity, the Natural Resources Defense Council and Greenpeace sued in March.

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On the Net: Fish and Wildlife Service Alaska: alaska.fws.gov/

Center for Biological Diversity: www.biologicaldiversity.org/
Natural Resources Defense Council: www.nrdc.org/
Greenpeace USA: www.greenpeace.org/usa/