The Interior Department failed to adequately consider the effects that oil and gas development could have on climate change and wildlife. Environmentalists, who have battled for decades to keep energy companies out of the refuge and other opponents, including some Alaska Native groups, are expected to file lawsuits to try to block lease sales. >"The decision sets up a fierce legal battle over the fate of a vast, remote area that is home to polar bears, caribou and the promise of oil wealth."