Reuters: The Obama administration dealt a setback to Royal Dutch Shell's Arctic oil exploration plans on Tuesday, saying established walrus and polar bear protections prevent the company from drilling with two rigs simultaneously at close range, as it had planned. The U.S. Fish and Wildlife Service issued Shell a permit which emphasized that under 2013 federal wildlife protections, companies must maintain a 15-mile (24-km) buffer between two rigs drilling simultaneously. The rule is meant to protect populations...