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LESSON 3 · Water: Earth's Scarcest Treasure

The Freshwater Squeeze Is Real

Less than 1 percent of the planet's water is liquid freshwater we can actually use — the rest is salty ocean or locked in ice. Demand for that sliver keeps climbing, and in many regions we now withdraw water faster than nature can replenish it. Pollution, drained wetlands, over-pumped aquifers, and a warming climate are the main accelerants of the squeeze.

Conservation is not about going without. Every healthy watershed does work for us for free — filtering pollutants, recharging groundwater, buffering floods, and sustaining fisheries. When rivers run dry and wetlands disappear, those services collapse, and replacing them with engineering costs far more than protecting them would have.