Using plants to purify canal water

Just south of Rome lie the Pontine Marshes, a vexed part of the Italian countryside. In ancient times, Roman emperors tried unsuccessfully to drain the marshes, something only achieved in the 1930s through a system of massive pumps and canals that removed enough water to turn the area into productive farmland. Yet today those canals have become heavily polluted, endangering the area?s agriculture and the health of its residents.

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