InsideClimate: When a 65-year-old ExxonMobil pipeline ruptured on March 29 [3] and spilled 210,000 gallons of oil in Mayflower, Ark., it opened the nation's eyes to the potential dangers lurking in the thousands of miles of aging and overlooked pipelines buried beneath neighborhoods and farms.
The spill also brought fresh attention to the debate over the proposed Keystone XL pipeline and the inherent risks of transporting Canadian tar sands across America's heartland. Exxon's Pegasus pipeline was carrying dilbit...