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"Water security is defined as the capacity of a population to safeguard sustainable access to adequate quantities of acceptable quality water for sustaining livelihoods, human well-being, and socio-economic development, for ensuring protection against water-borne pollution and water-related disasters, and for preserving ecosystems in a climate of peace and political stability. (UN-Water, 2013)"

"f the global community is to adequately address water challenges and associated risks, cooperation is imperative"

"If India can deploy adequate technology to treat water, it could significantly expand its water supply and better water means better public health and economic development"

"Texas voters last night approved the creation of a water bank expected to fund nearly $30bn in water infrastructure projects in the coming decades. The passage of Proposition 6 means the state will begin putting its 2012 State Water Plan - which calls for more than $50b in spending on new water infrastructure by 2060 - into action."

It's estimated that we use 9tn cubic metres of water every year. As the global population grows, it is becoming an increasingly precious resource, with millions forced to walk for more than a mile to collect their daily supply. We investigate the innovative technologies that will help tackle our water crisis in future.

Bill Gates sipping from a glass of water doesn't sound like riveting television. But add the subtitle: "This water was human waste five minutes earlier" and people will sit up and take notice.

Low water levels already are disrupting industries - including shipping and tourism - that rely on the world's largest navigation system and freshwater resource

Cost overruns, debt, inflation and harmful consequences make large dams very risky projects, says Oxford University report

The recent World Economic Forum Global Risks report identifies the 10 "biggest threats to the stability of the world" over the next 10 years. These are difficult times, and the catalogue of potential threats includes many that may seem familiar, including high unemployment, war and the spread of infectious disease.