AP: Four Greenpeace activists who had clung to an oil rig off western Greenland with rock-climbing gear were arrested Thursday after an Arctic storm forced them to abandon their environmental protest. Police spokesman Morten Nielsen said the four men — from the U.S., Finland, Poland and Germany — faced preliminary charges of violating a 1,650-feet security perimeter around the Stena Don rig and trespassing by climbing onto the installation. The activists had been suspended under …