10 things to know about 6-ton ivory crush - Article Photos 1/8

Edward Grace, a wildlife enforcement agent, holds a carved ivory tusk at the the National Wildlife Property Repository at the Rocky Mountain Arsenal National Wildlife Refuge near Commerce City, Colo., on Wednesday, Nov. 13, 2013. The tusk is part over 6-tons of ivory tusk and carvings worth millions of dollars that will be crushed at the facility on Thursday. The items were seized from smugglers, traders and tourists at U.S. ports of entry after a global ban on the ivory trade went into effect in 1989. (AP Photo/Ed Andrieski)