Baltimore Sun: If Americans needed a reminder of the serious environmental risks posed by the proposed Keystone XL pipeline, they got it last week with the oil spill in Mayflower, a suburb of Little Rock, Arkansas. More than 12,000 barrels of crude spilled into the town like a black river, coating lawns and forcing evacuations.
It's still not certain what caused a leak from the ExxonMobil pipeline that carries Canadian crude oil from Illinois to the Texas Gulf Coast. But what is clear is that such pipeline spills...