A United Nations University study estimated the value of turning human waste into energy at up to $9 billion globally.
The city of St. Petersburg may be among the first to capture some of that value.
"We're projecting that if we do this, we'll save $40 million over 20 years' present worth" Water Resources Sustainability Manager Steven Marshall told FOX 13. "It's really catching on because of the value of the product."
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