In southern Italy, ash is an export

In southern Italy, in the shadow of Mt. Etna, volcanic ash is part of life, and for generations its been used as fertilizer for agriculture. Now, the rest of the world is catching on, and companies are popping up in the region to collect and sell that ash elsewhere. The World's Host Carolyn Beeler speaks with Mario Pagliaro, research director at Italy's National Resource Council, about why volcanic ash works as a fertilizer.