Like for the local couple that went long-distance ice skating here on the Swedish west coast recently, there are disconcerting rumblings of change underfoot in the European refining industry. This couple saw a wave rolling toward them one morning as they skated half a mile from the mainland. It was from a large tugboat, whose portly progress created a slow wash that slipped under the soft salt ice and continued toward them. In its wake, they were stranded on a small iceberg. Much to their chagrin, they began a slow drift out to sea.