Mogpog, Philippines | August 2014: Rice paddy fields present a watery challenge for students making their way home. | (REUTERS/Erik De Castro)

Bijie, China | March 2013: Xu Liangfan, 37, escorts students on a cliff path toward Banpo Primary School, where Xu is headmaster. The narrow path is the only route between the school, located halfway up a mountain, and nearby Gengguan village. | (REUTERS/Stringer)

Banten, Indonesia | January 2012: Students hold on to the steel bars of a collapsed bridge as they cross a river to get to school. | (REUTERS/Beawiharta)

Moshenka, Russia | February 2007: Parents pick up their children from school on a horse-drawn sled. | (REUTERS/Grigory Dukor)

Bangladesh | April 2007: Children cross the Buriganga River in a boat, on their way to school in Dhaka. | (REUTERS/Rafiqur Rahman)

Nowshera, Pakistan | October 2010: A boy walks past burning fuel tankers along the Grand Trunk Road. | (REUTERS/Adrees Latif)

Srinagar, India | May 2012: Kashmiri children cross a damaged footbridge on their way home. | (REUTERS/Danish Ismail/REUTERS/Corbis)

Orllan, Kosovo | February 2012: Children cross the frozen Batllava Lake on their way to school. | (REUTERS/Hazir Reka)

Taytay, Philippines | July 2007: Students use chairs as a make-shift bridge to get to a classroom at Sitio Tapayan Elementary School. Teachers claim that the school grounds, built on a former garbage dump site, have no drainage and are constantly inundated with water. | (REUTERS/Romeo Ranoco)

Ridriguez, Philippines | June 2014: Students sit astride a bamboo raft used to ferry them across a river on their way to Casili Elementary School for the first day of classes. | (REUTERS/Romeo Ranoco)