Canary in the coal mine – shellfish growers

Ocean acidification is sometimes called the evil twin of climate change: Both are caused by rising amounts of carbon dioxide in the atmosphere. More CO2 dissolved in the water is making it harder for many creatures to form shells.

Senator Maria Cantwell (D-Washington) said the rising acidity of the world’s oceans needs to be a national priority for economic reasons. “Ocean acidification is a jobs issue,” Cantwell said. “Shellfish growers are the canary in the coal mine.”
KUOW.org, Seattle News, 12 Aug 2014