Governments in every part of the world encourage tourism as a way to boost their economies and improve the standard of living in their nations. But a certain percentage of tourists aren't traveling to see the sights or enjoy the weather. A conference at the University of Minnesota this weekend looks at the disturbing growth of sexual trafficking of children and how leaders in the tourism industry can help combat the problem. One of the keynote speakers at the "United Front for Children" Conference is the head of the United Nations Children's Fund, Ann Veneman. Veneman is a former U.S. Secretary of Agriculture and has led UNICEF for nearly a year. She says the underground nature of the problem makes statistics hard to come by, but the U-N estimates that 1-point-2 million children are trafficked around the world each year.