Henry Romero / Reuters
A worker fills tanks with water outside homes,on the outskirts of Mexico City March 22, 2011. The United Nations' (U.N.) World Water Day is held on March 22 every year to increase people's awareness of water's importance in environment, agriculture, health and trade.
Anindito Mukherjee / EPA
An Indian boy rows his makeshift raft over the polluted water of River Yamuna in New Delhi, India, on March 12. Yamuna is one of the most polluted rivers in the world, especially around Delhi, which dumps about 57 per cent of its waste into the river according to media reports. The official United Nations statement for World Water Day reads: This year, UN-Water chose the theme Water and Urbanization under the slogan Water for Cities: Responding to the Urban Challenge. The objective of WWD 2011 is to focus international attention on the impact of rapid urban population growth, industrialization and uncertainties caused by climate change, conflicts and natural disasters on urban water systems.
Noah Seelam AFP - Getty Images
A woman carries a jar of potable water, collected from a government water supply tanker, at a residential colony in Hyderabad on March 22.
Narendra Shrestha / EPA
A Nepalese worker digs around 30 feet under ground while making a well for water source in Kathmandu, Nepal, on March 15.
Mast Irham/ EPA
An Indonesian worker takes garbage out of a polluted river in Jakarta, Indonesia.
Pervez Masih / AP
Pakistani women villagers leave their homes in search of water in the suburbs of Hyderabad, Pakistan on Tuesday, March 22.
David Gray / Reuters
A man fills a container with water from a make-shift tap located next to a construction site and polluted canal in Beijing on March 22. China is now the world's second largest economy, but hundreds of millions of its people still rely on fouled water that will cost billions of dollars to clean. Growing cities, overuse of fertilizers, and factories that heedlessly dump wastewater have degraded China's water supplies to the extent that half the nation's rivers and lakes are severely polluted.