Students investigate the nature of water, human use of water, and the impact of humans on its availability and use. These investigations initiate an exploration of the nature of sustainability and through sustainability audits plans for human action. By exploring the practices of science from observing and measurement to analyzing and explaining data, students learn to use data and produce scientific knowledge for the public and begin to explore the bigger question of whether some of the practices in which we engage and the things we use are making our planet sick.