Former U.S. President Jimmy Carter holds a copy of his new book "A Call to Action: Women, Religion, Violence and Power" during a book signing at a Barnes & Noble in Los Angeles on March 28, 2014. In the book Carter says he believes the biggest challenge facing our world today is the subjugation and abuse of women and girls that manifests itself across the world in the form of child marriage, unequal pay, female genital mutilation, human trafficking, and more. UPI/Jim Ruymen