Reuters: The state of Alaska has sued the U.S. government, arguing that listing polar bears as a threatened species will hurt Alaskan oil and gas exploration, fisheries and tourism. The lawsuit, filed on Monday in federal court in Washington, seeks the withdrawal of a May 14 decision to list the big Arctic bears as threatened under the Endangered Species Act because climate change is melting their sea ice habitat. “We believe that the … decision to list the polar bear was not based on …