Today, two billion people live along or near a coast. By 2025, nearly all ocean shoreline will be inhabited and in use. Overfishing, pollution, over-population, and over-development of our coasts are having deadly consequences. The ocean that once seemed inexhaustible is buckling under the weight of our demands. Footprints in the Sand reveals the devastating impact of human activity on the ocean, focusing on the Mediterranean's contentious bluefin tuna fishery and the Gulf of Mexico's massive de-oxygenated dead zones. It also celebrates our successes with sustainable practices, like "no take" conservation projects managed by locals in Zanzibar, as well as the extraordinary turnaround in New Zealand's coral reefs.