Define what is meant by a water footprint. Show that the footprint will reflect a countries use of water for agriculture, industry, and/or residence. Solve a footprint equation. Discuss how to save water used in agriculture. Show photos of furrow, flood, spray, and drip irrigation. Discuss the efficiency of each one. Introduce hydroponic agriculture with water use at 95% less than traditional methods. Discuss industrial use in generating electricity, cooling nuclear power plants and refining mineral ores. Describe the difference between consumed and unconsumed water for these uses.