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Polar bear habitat at center of Alaska drilling debate

One lawsuit aims to halt Wednesday's lease sales in the Chukchi Sea. Another would contest any listing of the polar bear as 'threatened.'

On thin ice: Environmentalists say polar bears like these in northern Alaska will be in danger if the US allows sales of new drilling leases in the Chukchi Sea, set to begin Wednesday.

steve amstrup/ap/u.s. fish and wildlife service/file

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The political fight over offshore oil and gas drilling in Alaska intensifies this week.

Native Alaskans and environmentalists have filed a suit to prevent the federal government's sale of drilling leases in Alaska's Chukchi Sea. The sales, set to begin Wednesday, will allow drilling in about 30 million acres, including critical polar bear habitat, environmentalists say. A decision on whether to list polar bears as "threatened" under the Endangered Species Act (ESA) is expected this week as well.

The potential designation has left the Pacific Legal Foundation, a conservative public-interest law firm, poised to challenge "any arbitrary, unjustified ESA listing" of the iconic Arctic bear, setting up a likely court battle. Property-rights advocates and business groups have been weighing in as well.

Researchers differing over the impact of climate change also affects the debate. Hundreds of prominent scientists are urging Congress to pass legislation that would curb global warming in order to protect wildlife, including polar bears. But other experts say the data used to bolster the argument for ESA listing – in particular computer modeling showing declines in polar bear populations because of climate change and other factors – are based on "questionable assumptions."

All of this is uncharted territory for government-ordered species protection, which typically is based on numbers dwindling toward extinction.

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