A soldier evacuates an elderly woman in a flooded street in La Plata, 39 miles southeast of Buenos Aires, Argentina, on April 3.

People embrace outside a club where the Red Cross set up a center to help flood victims in La Plata, in Argentina's Buenos Aires province, on April 4.

Vilma Gorostiaga cries outside her home as she dries her family pictures on the ground in La Plata, in Argentina's Buenos Aires province, on April 4.

Juan Fernandez sits inside a club where the Red Cross set up a help center for people affected by flooding after his home was damaged in La Plata, in Argentina's Buenos Aires province, on April 4.

A polluted stream which has turned white in Dongchuan district of Kunming, Yunnan province, March 20. According to local media, the source of the pollution is waste water discharged by nearby mining industries.

Farmers dig ditches from a white polluted stream to farm fields for irrigation in Dongchuan district of Kunming, Yunnan province, March 21.

A villager carries buckets of water to be used for drinking from a white polluted stream in Dongchuan district of Kunming, Yunnan province, March 20.

A villager holds two bottles of water, one from the polluted stream, left, and the other normal mineral water, in Dongchuan district of Kunming, Yunnan province, March 21.

University students punch the air as they march through Kim Il Sung Square in downtown Pyongyang, North Korea, on March 29, 2013.

A picture released by the North Korean Central News Agency (KCNA) shows Kim Jong Un convening an urgent operation meeting at 0:30 am on March 29, 2013 at an undisclosed location, in which he ordered strategic rocket forces to be on standby to strike US and South Korean targets at any time.

An aerial view of the Taim Ecological Station on fire, in Rio Grande do Sul state, southern Brazil, on March 27, 2013.

Men peer through the former window of a destroyed school in the village of Budyali, Nangarhar province, Afghanistan, on March 19, 2013. Taliban militants attacked the nearby district headquarters in July 2011, then took refuge in the school. The Afghan National Army requested help from coalition forces, who responded with drones, fighter jets and rockets, leaving the school destroyed, according to village elders.

Ahmed Shah, 12, center, recalls the attack on his village in the yard of a house where he and his family found refuge in the village of Khalis, Nangarhar province, on March 20, 2013.

Boys study in a makeshift school in the village of Budyali, Nangarhar province, on March 19, 2013.

Papers and schoolbooks lie among the debris of a destroyed school in the village of Budyali, Nangarhar province, on March 19, 2013.

Men walk through the debris of the destroyed school in the village of Budyali, Nangarhar province, on March 19, 2013.

A screenshot made from the Google Maps website shows stranded ships left as a testament to the power of the tsunami which hit the area, near a road in Namie, Japan.

A crushed building in Namie, a nuclear no-go zone where former residents have been unable to live since they fled from radioactive contamination near the Fukushima Daiichi nuclear power plant two years ago.

Chinese President Xi Jinping and First Lady Peng Liyuan bid farewell as they board their plane to depart from the Julius Nyerere International Airport in Dar es Salaam, Tanzania, on March 25, 2013.

Peng Liyuan observes a moment of silence during a visit to Gongo la Mboto cemetery, where Chinese workers who died while constructing a railway are buried, on the outskirts of Dar es Salaam on March 25, 2013.

South Africa's President Jacob Zuma shares a joke with Peng Liyuan during an official lunch hosted by Zuma and his wife in Pretoria on March 26, 2013.

Kim Jong Un looks at the latest combat and technical equipment made by unit 1501 of the Korean People's Army, during his visit to the unit on March 24, 2013.

Kim Jong Un holds a gun as he inspects the second battalion under the Korean People's Army Unit 1973, honored with the title of "O Jung Hup-led 7th Regiment", on March 23, 2013.

An anti-Morsi protester stands with the national flag after protesters burned Muslim Brotherhood buses during clashes near the Muslim Brotherhood's national headquarters in Cairo's Moqattam district on March 22, 2013.

Muslim Brotherhood supporters conduct Friday noon prayers in front of the main headquarters of the Brotherhood in Cairo on March 22, 2013.

Egyptians shout anti-Muslim Brotherhood slogans during a march from downtown to the main Brotherhood headquarters in the hilltop neighborhood of Muqattam, Cairo, Egypt, on March 22, 2013. Thousands of protesters from different areas of Cairo are marching on Friday to express their rejection of the Muslim Brotherhood and President Mohammed Morsi's rule.

Supporters of the Egyptian Muslim Brotherhood clash with anti-government protesters near the movements' headquarters in Cairo on March 22, 2013.

Anti-Morsi protesters carry a Muslim Brotherhood member after hitting him during clashes near the Muslim Brotherhood's national headquarters in Cairo on March 22, 2013.

Egyptian policemen write a report at a destroyed branch headquarters of the Muslim Brotherhood after protesters broke in to the building in Cairo, Egypt, on March 22, 2013.

An Egyptian anti-Muslim Brotherhood protester throws a stone towards Muslim Brotherhood supporters during clashes near the party's national headquarters in Cairo on March 22.

An injured Egyptian anti-Muslim brotherhood protester is taken away by his comrades, during clashes near the Muslim Brotherhood's national headquarters in Cairo, Egypt, on March 22.

U.S. President Barack Obama and Palestinian President Mahmoud Abbas walk in the Church of the Nativity during their visit to the West Bank city of Bethlehem on March 22, 2013.

Obama meets Greek Orthodox Patriarch Theophilos III (3rd left) during a tour of the Church of the Nativity.

Obama tours the Hall of Names at the Yad Vashem Holocaust Museum in Jerusalem, alongside Avner Shalev (right), Chairman of the Yad Vashem Directorate, and Israeli Prime Minister Benjamin Netanyahu.

Obama pays his respects in the Hall of Remembrance at Yad Vashem after Marines laid a wreath on his behalf.

Obama listens to Netanyahu during their visit to the Children's Memorial at Yad Vashem.

Obama walks with Rabbi Israel Meir Lau in the Hall of Remembrance at Yad Vashem.

Firemen attempt to extinguish fires during riots in Meikhtila, Myanmar, on March 22, 2013. Unrest between Buddhists and Muslims in central Myanmar has reduced neighborhoods to ashes and stoked fears that last year's sectarian bloodshed is spreading into the country's heartland in a test of Asia's newest democracy.

A riot policeman stands guard next to a burning building in Meikhtila on March 22, 2013. A curfew was imposed for the second night as riots between Buddhists and Muslims continued.

People carry their belongings as they arrive at a temporary rescue center in Meikhtila on March 22, 2013.

Residents sit on a railway track watching buildings burn around a mosque in riot-hit Meikhtila on March 21, 2013.

Burnt houses are seen in Meikhtila on March 21, 2013.