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LESSON 3 · Water: Earth's Scarcest Treasure

The Modern Water Toolkit

Saving water has moved well beyond simply asking people to use less, leaning on smarter technology and economics. A few approaches are gaining real traction:

  • Drip irrigation delivers water straight to plant roots, running 90–95% efficient versus the 50–70% of flood irrigation it replaces
  • Leak detection and repair plugs distribution networks, where the average city loses roughly a third of its treated water before it reaches a tap
  • Water reuse recycles treated wastewater for farms, industry, and even drinking supplies
  • Smarter water pricing and demand management reward conservation instead of waste