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Unsustainable exploitation of sand destroys rivers and seas

Every day, 18 kilos of sand and gravel are extracted by each inhabitant of the planet for 
the manufacture of concrete, asphalt and glass. Changes in consumption patterns, the increase 
in population and the increase in urbanization have tripled their demand in the last 20 years, 
and nowadays more is exploited than occurs naturally, negatively affecting our planet.