Regrowing a Forest

Regrowing a Forest
September 5, 2017 Christina Mullin

What can we do about the excessive amount of waste we are generating worldwide? How do we inexpensively create an environment suited for trees to thrive in, on land that is depleted and deforested? This following innovative out-of-the-box thinking has solved 2 problems at once, while creating an innovative and sustainable business model.

In 1997, ecologists Daniel Janzen and Winnie Hallwachs approached an orange juice company in Costa Rica with an off-the-wall idea. In exchange for donating a portion of unspoiled, forested land to the Área de Conservación Guanacaste — a nature preserve in the country’s northwest — the park would allow the company to dump its discarded orange peels and pulp, free of charge, in a heavily grazed, largely deforested area nearby. One year later, one thousand trucks poured into the national park, offloading over 12,000 metric tons of sticky, mealy, orange compost onto the worn-out plot.

The site was left untouched and largely unexamined for over a decade. A sign was placed to ensure future researchers could locate and study it.

16 years later, Janzen dispatched graduate student Timothy Treuer to look for the site where the food waste was dumped. Treuer initially set out to locate the large placard that marked the plot — and failed.”It’s a huge sign, bright yellow lettering. We should have been able to see it,” Treuer says. After wandering around for half an hour with no luck, he consulted Janzen, who gave him more detailed instructions on how to find the plot. When he returned a week later and confirmed he was in the right place, Treuer was floored. Compared to the adjacent barren former pastureland, the site of the food waste deposit was “like night and day.”

Bananas bound for Whole Foods (I get so excited every time I see them there!)

“It was just hard to believe that the only difference between the two areas was a bunch of orange peels. They look like completely different ecosystems,” he explains.

The area was so thick with vegetation he still could not find the sign.

Treuer and a team of researchers from Princeton University studied the site over the course of the following three years. The results, published in the journal “Restoration Ecology,” highlight just how completely the discarded fruit parts assisted the area’s turnaround. The ecologists measured various qualities of the site against an area of former pastureland immediately across the access road used to dump the orange peels two decades prior. Compared to the adjacent plot, which was dominated by a single species of tree, the site of the orange peel deposit featured two dozen species of vegetation, most thriving.

In addition to greater biodiversity, richer soil, and a better-developed canopy, researchers discovered a tayra (a dog-sized weasel) and a giant fig tree three feet in diameter, on the plot.

“You could have had 20 people climbing in that tree at once and it would have supported the weight no problem,” says Jon Choi, co-author of the paper, who conducted much of the soil analysis. “That thing was massive.”

Recent evidence suggests that secondary tropical forests — those that grow after the original inhabitants are torn down — are essential to helping slow climate change. “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.”

Meanwhile, much of the world is awash in nutrient-rich food waste. In the United States, up to half of all produce in the United States is discarded. Most currently ends up in landfills.

“We don’t want companies to go out there will-nilly just dumping their waste all over the place, but if it’s scientifically driven and restorationists are involved in addition to companies, this is something I think has really high potential,” Treuer says.

Another of the study’s co-author David Wilcove, a professor of ecology and evolutionary biology and public affairs and the Princeton Environmental Institute:

“Plenty of environmental problems are produced by companies, which, to be fair, are simply producing the things people need or want. But 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.”