Scientists want to develop ways to recapture phosphorus before the resource runs out, says Fred Koch, a researcher at the University of British Columbia. The International Institute for Sustainable Development says the resource is essential because it helps grow food as a component of agricultural fertilizers, but some experts predict phosphorus could run out in as little as 30 years. Koch has developed a process that removes phosphorus from liquid sewage and turns it into slow-release fertilizer pellets.

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