Scientists restore drying river in Arizona - by adding wastewater - and see a boom in biodiversity

A collection of sewage - filled with human feces, garbage, and disease-ridden substances - being dumped into a body of water is clearly not the most attractive image.

But according to scientists from the University of Arizona, wastewater has the potential to restore threatened ecosystems - so long as it's used correctly. In fact, new research in the journal Restoration Ecology details how scientists have unlocked a breakthrough in their work to save the Santa Cruz River, which runs 180 miles through Arizona and Mexico.

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