(Clockwise from top left) Brackish spring on the up-gradient margin of Laguna Brava, part of the Tilopozo wetland system of Salar de Atacama, Chile photograph courtesy John McCartney). Village domestic well, Suriyawewa, Uda Walawe catchment, Sri Lanka. Percussion drilling rig located over a Chalk borehole in eastern England. Pulp and paper mill industrial complex in northwest Russia. Other photographs courtesy of Kevin Hiscock.