Even though the earth is 75% covered in water, only 1% is available for human consumption, and of that 70% of that goes to irrigation and 22% goes to industry. That leaves 8% of the 1% available for drinking, dishwashing, and watering your lawn. Spread evenly worldwide, that equates to 2.5 gallons per person per year. Developed countries use more than their share, however - about 100 gallons per person - and about 1 billion people currently lack access to clean drinking water.
Water conservation in developed countries can have very significant positive impacts, so if you can, stop the water!
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