As more pipelines are built to take oil to a coast, North American prices will continue to merge with global oil markets. (jeffrubinssmallerworld.com)
In the uncertain, often volatile global oil market, it is difficult to predict long - term fuel costs and, more specifically, costs at the time of the trip. (discovermagazine.com)
Depending too much on natural gas for power has long been seen as risky, because its price was traditionally volatile — largely linked to the roller - coaster global oil market. (news.nationalgeographic.com)