Tammy Wade (left) is hugged by Dana Givens in what is left of her home in El Reno, Okla., on Sunday, after it was destroyed by a tornado. Joe Raedle/Getty Images hide caption
natural disasters
A woman carries a child through a flooded road on the island of Mindanao. AFP/Getty Images hide caption
A Pakistani man and boy, displaced by floods, walk through flood waters on Aug. 22, 2010 in the village of Baseera near Muzaffargarh in Punjab, Pakistan. Daniel Berehulak/Getty Images hide caption
Cars sit in debris in a flooded street in Teresopolis, Rio de Janeiro state, Brazil, on Wednesday (Jan. 12, 2011). Roberto Ferreira/AP hide caption