Book excerpt: Water sustains life: without it, humans cannot survive for more than a few days. And yet this precious fluid is becoming increasingly politicized as the debates about control and ownership of water itself, and of the many organizations which govern its use, gain force. Maggie Black explores the many roles water plays in human life and, as the defense of water rights looks set to become an explosive issue, provides a clear overview on the vital issues of distribution, technology, irrigation, land use and commodification.