Wastewater is a growing health and environmental threat, accounting for almost as much planet warming emissions as the aviation industry.
Yet with the right policies, wastewater could provide alternative energy to half a billion people, supply over 10 times the water provided by current global desalination capacity and offset over 10 percent of global fertilizer use. These findings appear in an analysis published last week by the UN Environment Program and GRID-Arendal with the Global Wastewater Initiative .
“Globally, wastewater is full of potential, yet it is currently allowed instead to contaminate the ecosystems we rely on,” said Leticia Carvalho, principal coordinator of the Marine and Freshwater Branch of UNEP. “We must not let the opportunity simply disappear down the drain: it’s time to realize the promise of wastewater as an alternative source of clean water, energy, and important nutrients.”
Yet wastewater can become a climate solution: in generating biogas, heat and electricity, it can produce about five times more energy than is required for its treatment―enough to provide electricity for around half a billion people per year. By reducing water insecurity, good management of wastewater can also support countries’ efforts to adapt to climate change.
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