One lawsuit aims to halt Wednesday's lease sales in the Chukchi Sea. Another would contest any listing of the polar bear as 'threatened.'
A federal agency is poised to say whether global warming means the bear should be added to the 'threatened species' list.
Scientists say drastic measures need to be taken to restore the bluefin.
Northwest's dams are a source of clean energy. But scientists say they endanger salmon and orcas.