

Argentine artist Nicolas Garcia Uriburu, accompanied by Greenpeace activists, throws a green substance in the Riachuelo River as part of a protest in Buenos Aires, Argentina, on March 22. Greenpeace dyed the river green, the most polluted in the nation's capital, to mark World Water Day. Natacha Pisarenko/AP
A worker washes his face in Mumbai, India, on March 22, World Water Day. More than a billion people lack access to clean water in the world. Arko Datta/Reuters
Afghan children collect water from a pump in Kabul, Afghanistan, on March 22. Omar Sobhani/Reuters
Villagers carry drinking water in plastic containers on March 21 in Dela Township, in Rangoon, Burma (Yangon, Myanmar). The theme for World Water Day 2010 is Clean Water for a Healthy World. Khin Maung Win/AP
On World Water Day 2010, a boy plays at the Taipei Water Park in Taiwan, on March 22. Pichi Chuang/Reuters
A man dives into a polluted section of the River Yamuna to scavenge for ornaments and coins left by Hindus at the river bank in New Delhi, India, on March 22. On World Water Day, officials say factories are ignoring regulations and dumping untreated sewage and industrial pollution into the river that gives much of the capital its drinking water. Gurinder Osan/AP
A Cambodian villager waters a farm field near Chriev village, Cambodia, on March 21 ahead of World Water Day. Heng Sinith/AP
On World Water Day in Berhampur, India, an Indian boy runs through a parched field on March 22. Biswaranjan Rout/AP
A Pakistani youth looks out of a water reservoir as he bathes, and others wait their turn on World Water Day in the outskirts of Islamabad, Pakistan, on March 22. Muhammed Muheisen/AP
Homes in the Lake Shore subdivision in Fargo, ND, are surrounded by flood waters from the swollen Red River, which crested on Sunday at just under 37 feet. M. Spencer Green/AP
Baby bottles containing polluted water stand on the Budesplatz in Bern, Switzerland, on March 22. The action was organized by the Swiss association for International Cooperation Helvetas to highlight the UN's World Water Day. Peter Klaunzer/AP
A woman walks past empty water containers in a treatment plant in Colombo, Sri Lanka, on March 22. Andrew Caballero-Reynolds/Reuters
In Mumbai, India, a worker sleeps on bottled water stacked inside a transport vehicle on March 22, World Water Day. Arko Datta/Reuters
Indian women line up to fill water containers from a tanker at a shanty town in Calcutta, India, on March 22. Bikas Das/AP
Afghan children try to collect water from a broken pipe in Kabul, Afghanistan, on March 22. Omar Sobhani/Reuters
Filipino women rowers are doused with water by firefighters during a hot day in Manila, Philippines, on March 21. The athletes are competing at the Manila Bay Summer Sea Sports Festival, an annual water sports event held ahead of World Water Day and amid a drought that has affected farmlands and destroyed crops in many parts of the country. Aaron Favila/AP