Today marks the twentieth anniversary of the Exxon Valdez oil spill, one of the worst environmental disasters in history. The Exxon Valdez spilled between 11 and 38 million gallons of crude oil into the fishing waters of Prince William Sound. The spill contaminated more than 1,200 miles of Alaska’s shoreline and killed hundreds of thousands of seabirds and marine animals. It also dealt a staggering blow to the residents of local fishing towns, and the effects of the disaster are still being felt today. We speak with Riki Ott, a community activist, marine toxicologist, former commercial salmon fisherma’am and author of two books on the spill. Her latest is Not One Drop: Betrayal and Courage in the Wake of the Exxon Valdez Spill. [includes rush transcript]