An Afghan carries a bundle of wood in Nahr-i Sufi near the DHQ (Char Dara District Police Headquarter) in the province of Kunduz on March 30, 2012. The Afghan economy has always been based on agriculture, despite the fact that only 13 percent of its total land is arable and just eight percent is currently cultivated. (AFP/Getty Images/Johannes Eisele)
AFP PHOTO/ FRANCISCO LEONG
Chelsea's defender John Terry (up) vies with Benfica's Argentinian midfielder Pablo Aimar (down) during their UEFA Champions League quarter finals football match at Luz Stadium in Lisbon on March 27, 2012.
This NASA image obtained March 27, 2012 shows wispy tendrils of hot dust and gas glowing in this ultraviolet image of the Cygnus Loop Nebula, taken by NASA‚€™s Galaxy Evolution Explorer. The nebula lies about 1,500 light-years away, and is a supernova remnant, left over from a massive stellar explosion that occurred 5,000-8,000 years ago. The Cygnus Loop extends more than three times the size of the full moon in the night sky, and is tucked next to one of the 'swan‚€™s wings' in the constellation of Cygnus. The filaments of gas and dust visible here in ultraviolet light were heated by the shockwave from the supernova, which is still spreading outward from the original explosion. The original supernova would have been bright enough to be seen clearly from Earth with the naked eye.
Tibetan exile Janphel Yeshi, 27, runs as he is engulfed in flames after he set himself on fire during a protest in New Delhi on March 26, 2012. A Tibetan exile set himself on fire on Monday during a rally in New Delhi to protest against an upcoming visit to India by Chinese President Hu Jintao, police said. (AFP/Getty Images)
Feriha Kaya attends a rally demanding justice for Trayvon Martin in Freedom Plaza, Saturday, March 24, 2012, in Washington. Martin, an unarmed young black teen, was fatally shot by a volunteer neighborhood watchman. (AP/Haraz N. Ghanbari)
Policemen arrest an Occupy Wall Street movement supporter while they were marching from Zuccotti Park to Union Square to protest perceived police brutality in New York, March 24, 2012. (Reuters/Carlo Allegri)
People gather for a rally for slain teenager Trayvon Martin in Washington, D.C., Saturday, March 24, 2012. (Keith Lane/MCT)
Occupy Wall Street movement supporters lay on the ground in protest during a march from Zuccotti Park to Union Square to protest perceived police brutality in New York, March 24, 2012. (Reuters/Carlo Allegri)
World Water Day, which is celebrated on March 22, aims to focus on water and food security, and the sustainable management of water resources, according to the United Nations. World Water Day calls for international attention on the impact of rapid urban growth, industrialisation and uncertainties caused by climate change, conflicts and natural disasters on urban water systems.
PUNIT PARANJPE/AFP/Getty Images
An Indian girl carries a stainless steel pot on her head as she stand outside the house in the fisherman colony in Mumbai on March 22, 2012.
A boy is silhouetted against the setting sun while arranging bottles of drinking water for sale at 10 PKR ($0.11) along Karachi's Clifton beach March 15, 2012. World Water Day, which is celebrated on March 22, aims to focus on water and food security, according to the United Nations.
ITAN ABRAMOVICH/AFP/Getty Images
A woman smokes tobacco during a ceremony held on World Water Day in Bogota, on March 22, 2012. Hundreds of people gathered in different parks and wetlands of Colombia to celebrate World Water Day with songs and prayers, in an initiative aimed at raising awareness about the importance of water resources.
AP Photo/Mahesh Kumar A.
Indians collect water from a public tap at a slum area in Hyderabad, India, March 22, 2012. The U.N. estimates that more than one in six people worldwide do not have access to 20-50 liters (5-13 gallons) of safe freshwater a day to ensure their basic needs for drinking, cooking and cleaning.
TONY KARUMBA/AFP/Getty Images
A water-vendor collects water in jerrycans to sell on March 22, 2012 in the Mathare slum, Nairobi ,where a water shortage continues to bite on World Water Day. A hundred and thirty countries on Tuesday urged the upcoming Rio Summit to speed action on providing the poor with access to clean water and sanitation and fix worsening problems of water scarcity and pollution. Slum dwellers in Kenya, Nigeria, Ghana and Zimbabwe hold a meeting in Nairobi, organised by Amnesty International, to draw attention to their plight as African ministers hold talks on housing problems.
AP Photo/Rafiq Maqbool
A young Indian boy holds a pot after collecting water from a broken pipe in a slum on the outskirts of Mumbai, India, March 22, 2012.
AP Photo/Sushanta Das
A young Indian boy drinks water from a public tap in Agartala, India, Wednesday, March 21, 2012. As the world gears up to celebrate World Water Day on March 22, 2012.
AP Photo/Biswaranjan Rout
A woman bathes using water collected from various areas on World Water Day at a slum in Bhubaneswar, India, March 22, 2012.
A fisherman casts a net over the waters of Lake Cocibolca, also known as Lake of Nicaragua March 21, 2012. The lake, with an area of 3,166 square miles (8,200 square km), is the biggest in the country.
A dead fish lies on the cracked earth of the drought-stricken La Sorrueda reservoir near Santa Lucia village, at the Spain's Canary island of Gran Canaria, March 22, 2012.
AP Photo/Rajesh Kumar Singh
A Hindu women offers prayers on the banks of the River Ganges, on World Water Day in Allahabad, India, March 22, 2012.
Manchester City's Micah Richards (R) challenges Chelsea's Gary Cahill during their English Premier League soccer match at the Etihad Stadium in Manchester, northern England, March 21, 2012.