For most people, discarded orange peel is little more than food-processing waste. In Costa Rica, one abandoned environmental experiment showed it could become something very different. During the late 1990s, around 12,000 tonnes of leftover citrus peel were spread across a worn-out cattle pasture beside the Guanacaste Conservation Area as part of an unusual restoration project. The trial was cut short after a legal challenge and soon faded from public attention. Years later, when scientists returned to inspect the site, they struggled to find it at all.
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