There’s more to oranges than juice! Back in the 1990’s, two ecologists suggested orange juice manufacturer Del Oro donate some of their land near a national park in Costa Rica; in exchange, they’d be able to deposit agricultural waste for free on degraded land inside the park. Del Oro agreed and dumped 1,000 truckloads of orange pulp and peels on the land. Today, that area is a thriving forest. A Princeton University-led team of researchers journeyed to the forest to discover just how much that food trash transformed the forest – and how other businesses might do the same.


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Del Oro donated land to Área de Conservación Guanacaste at the suggestion of husband and wife ecologist team Daniel Janzen and Winnie Hallwachs, who’d worked as advisors at the park. The company unloaded around 12,000 metric tons of orange waste for biodegradation until rival company TicoFruit sued, saying Del Oro had defiled the park. TicoFruit won and the land went largely overlooked for over a decade.

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Years later, environmental researchers decided to evaluate the site. They discovered a lush forest that had a 176 percent increase in aboveground biomass – what Princeton described as the trees’ wood – in the seven acres they studied. They also found a difference between areas where orange peels hadn’t been dumped and where they had – according to Princeton, the latter showed richer soil, greater tree-species richness, and more closure in the forest canopy.

Princeton University, Costa Rica, Del Oro, Área de Conservación Guanacaste, orange, oranges, orange peel, orange peels, agricultural waste, forest, forests, environment, biodegrade

The researchers think regenerating forests with agricultural waste could help us sequester carbon. Princeton graduate student Timothy Treuer said in a statement, “This is one of the only instances I’ve ever heard of where you can have cost-negative carbon sequestration. It’s not just a win-win between the company and the local park – it’s a win for everyone.”

Princeton University ecologist David Wilcove thinks more businesses could help the environment in similar ways. He said while companies do generate environmental problems, “…an awful lot of those problems can be alleviated if the private sector and the environmental community work together. I’m confident we’ll find many more opportunities to use the leftovers from industrial food production to bring back tropical forests. That’s recycling at its best.”

University of Pennsylvania, Beloit College, and University of Minnesota scientists joined the Princeton researchers to write a study published by the journal Restoration Ecology this week.

Via Princeton Environmental Institute

Images via Pixabay and Princeton University