Elementary school children, evacuated from Tomioka town near the disaster stricken area, listen to a teacher as their school reopened at a temporary school at Miharu town in Fukushima prefecture on September 1, 2011. Environmental group Greenpeace urged Japanese government to delay the September 1 opening of schools in Fukushima city, arguing that radiation in the air and soil spell a health threat to children. AFP PHOTO / JIJI PRESS