From CBSNews.com on YouTube:

Bob Simon gets a glimpse of an ancient tuna fishing method called “la mattanza” off the coast of Sardinia. The global demand of sushi-grade tuna is having a big impact on the local fishermen. (CBSNews.com)

On the Net: The King Of Sushi, Growing Demand For Sushi Is Having A Big Impact On The Bluefin Population – CBS News