Scientists warn of too many pink salmon in North Pacific

Biological oceanographer Sonia Batten experienced her lightbulb moment on the perils of too many salmon three years ago as she prepared a talk on the most important North Pacific seafood you'll never see on a plate—zooplankton.

'Toxic' Italian steel plant clean-up is a towering task

Rock climbers scale a giant canopy in Taranto to build the world's biggest iron-ore park cover as steel giant ArcelorMittal strives to clean up and turn around Italy's most polluting plant.