This captivating and informative CBC Radio documentary looks at the environmental crisis that looms over the world's oceans. Award-winning environmental journalist Alanna Mitchell joins host Bob McDonald as they explore the major topics in her book, Sea Sick. Mitchell identifies the five biggest problems the oceans face: dead zones, ocean acidification, the demise of the coral reefs, over-fishing and marine debris. Other respected ocean researchers also weigh in on what's plaguing our oceans.