They're members of the global-minded teens club: (left to right) Toluwanimi Sola-Adeyemi of Lagos, Chloe McGill of Seattle and Emine Arcasoy of Chapel Hill. Courtesy of Tolu Sola-Adeyemi, Chloe McGill and Emine Arcasoy. hide caption

itoggle caption Courtesy of Tolu Sola-Adeyemi, Chloe McGill and Emine Arcasoy.

A man carries old plastic containers in March 2012 through the Kibera slum in Nairobi, Kenya. Kenyans living in poverty often collect plastics that they can turn into cash by taking it to companies that recycle it. Carl de Souza/AFP/Getty Images hide caption

itoggle caption Carl de Souza/AFP/Getty Images

John Mayer sings to tens of thousands at the 2013 Global Citizen Festival in Central Park. The event is part of an effort to end extreme poverty. Stephen Lovekin/Getty Images hide caption

itoggle caption Stephen Lovekin/Getty Images

Haley Nordeen, 19, is spending the entire summer at the Prodesenh center in San Mateo Milpas Altas, Guatemala. The American University student helped build the center's new library. Carrie Kahn/NPR hide caption

itoggle caption Carrie Kahn/NPR

Jackson Merrick, a sixth-grader from McLean, Va., says he donates half of his allowance to charity. Morgan Walker/NPR hide caption

itoggle caption Morgan Walker/NPR