A rag picker takes a nap on a sack filled with used plastic bottles, at the side of a road in New Delhi, India. REUTERS/Anindito Mukherjee

A boy tries to avoid scattered garbage floating on a flooded street in Shantou, Guangdong province August 23, 2013. REUTERS/Stringer

Palestinian Olympic runner Nader Al-Masri stretches near his house in Beit Hanoun in the northern Gaza Strip April 10, 2014. Masri, who has participated in 40 international contests including the 2008 Olympics in Beijing, was denied a permit by Israeli authorities to travel to the occupied West Bank for the Palestine Marathon on Friday. REUTERS/Mohammed Salem

A Muslim girl, who is protected by local Christians, sits outside a house in the town of Gaga April 6, 2014. REUTERS/Goran Tomasevic

Afghan schoolchildren follow ISAF soldiers with the German Federal Armed Forces (Bundeswehr) patrolling the mountain villages on the outskirts of Feyzabad on September 27, 2008. (AP Photo/Anja Niedringhaus)

Afghan day laborer Zekrullah, 23, takes a break after preparing kilns to fire the bricks at a brick kiln factory on the outskirts of Kabul, on November 7, 2013. In the last two years as US and NATO troops prepare to leave Afghanistan, brick makers say business has dropped off by almost half. (AP Photo/Anja Niedringhaus)

Photojournalist Anja Niedringhaus Killed in Afghanistan

One of the last images captured by photojournalist Anja Niedringhaus. An Afghan girl helps her brother down from a security barrier set up outside the Independent Election Commission (IEC) office in the eastern Afghan city of Khost, on April 3, 2014. Afghans head to the polls to elect a new President on April 5, 2014. (AP Photo/Anja Niedringhaus)

A child whose parents work in a brick kiln attends a class in an open air school at Krishnadevpur village, north of Kolkata, February 11, 2014. REUTERS/AHMAD MASOOD

A Syrian refugee child who fled the violence from the Syrian town of Flita, near Yabroud, poses for a photograph at the border town of Arsal, in the eastern Bekaa Valley March 20, 2014. REUTERS/Hassan Abdallah

Pakistani Christian boy, Suhail Pervez, 9, plays snooker on a table he built, in a slum that hosts Christian families, in Islamabad, Pakistan, on March 27. Pakistani authorities plan to demolish slums, mostly occupied by Christians and people displaced in tribal areas and neighboring Afghanistan, saying it poses a security threat to the already vulnerable capital. (Muhammed Muheisen/Associated Press)