Canary in the coal mine – oysters

A company near San Diego raises oysters. Last year, Dennis Peterson says they could only get a quarter of the young oysters, or seed, they need from hatcheries in the Pacific Northwest. Dennis Peterson worries about what that means for his oysters.

“When it comes to climate change,” he says, “the oyster in the ocean is like a canary in a coal mine.”
CBS News, 27 Sep 2013