Alberta oil spill

A pipeline leaked 28,000 barrels of oil into a nearby muskeg and a beaver pond in April 2011.
A pipeline leaked 28,000 barrels of oil into a nearby muskeg and a beaver pond in April 2011. (Briar Stewart/CBC)

One of the largest oil spills in Alberta's history has leaked nearly 28,000 barrels of crude oil since Apr. 29