According to journalist Adam Minter, we're experiencing a global "crisis of stuff." Americans discard more than 100 billion pounds of unwanted items annually, from electronics to textiles to furniture. Meanwhile, demand for our castoffs is shrinking: Twenty years ago, China was a major importer of used clothing. Now it's a major exporter. We'll talk to Minter about what he calls "the rising tide of unwanted secondhand" and what we can do to stem it. His new book is "Secondhand: Travels in the New Global Garage Sale."