Tea time: Novel research could help understanding of climate change

New College biology students are participating in a worldwide research project that could eventually help protect the planet against threats such as global warming and rising sea levels.

And they’re using an inexpensive and novel tool to gather data about the global carbon cycle: tea bags.

Biology professor Brad Oberle checks the placement of tea bags buried to measure the rate of decay in soil at Robinson Preserve in Manatee County.
Biology professor Brad Oberle checks the placement of tea bags buried to measure the rate of decay in soil at Robinson Preserve in Manatee County.

Nineteen students from the Forest Ecology Lab class, taught by Assistant Professor Brad Oberle, recently traveled to several ecological restoration sites in Manatee County, including Robinson Preserve, Perico Preserve and G.T Bray Park.

Once there, Oberle said they surveyed the area, to determine, “what kinds of plants are there, how wet to soil is, and other features of the local landscape, and those are the features our students were measuring.” They also collected soil samples. “We were looking at the moisture content, the density of the soil, and we measured exactly how much carbon the soil is giving off, using an instrument we have here on campus,” he said.

They then “planted” tea bags in various places, where they will sit in the ground for the next three months.

The project, called the Tea Bag Index (www.teatime4science.org), began at the University of Utrecht, in The Netherlands, in 2010, where researchers came up with a cheap and easy method to measure the decay rate of plant material.

The process is simple: Using specific teas (only Lipton green tea or Rooibos tea can be used), weigh each tea bag, bury them 8 centimeters deep, 15 centimeters apart, and leave them for 90 days. Dig them up, weigh them again and submit the findings at the researchers’ website.

Oberle says the results can help scientists learn how much carbon is being released into the air, which can have an effect on climate change. “On a global scale, we can expect to see some big differences in how soil decay works,” he explained. “The colder it is, the slower biology works. So we would expect to find faster decay in the tea bags we plant here in Florida than you would for tea bags planted in Norway. The big picture, it’s about confirming some big global patterns in soil decay.”

He added his class’ research is being done in former agricultural areas. “Agricultural soils tend to lose carbon.
When tractors go in and harvest all the plants, they take all the carbon with them, so the carbon doesn’t make its way back into the soil; it doesn’t get stored there.

“The idea is you can flip the script with ecological restoration by putting native plants back in. Those plants can contribute more carbon to the soil. That means that it winds up there, in the soil, rather than in the atmosphere.”

Oberle says he hopes the study will answer questions about local soil carbon, to get a better sense of how much carbon these different habitats can store. “If different habitats types have potential to store different amounts of carbon, can we store more in a restored mangrove or restored wetland, than we can store in flat pine woods?”

Besides the tea bag research, Oberle’s class is busy with several other projects. They’ll be taking an inventory of mangrove trees in the campus’ uplands preserve, as well as documenting every tree species growing on campus. The class will use the information with the goal of applying by the end of the semester to have the New College campus recognized as an arboretum. “We have a very busy schedule,” Oberle said.


Located in Sarasota, New College of Florida has educated intellectually curious students for lives of great achievement since its founding in 1960. As the State of Florida’s designated honors college, New College provides an exceptional education that transforms students’ intellectual curiosity into personal accomplishment. The 110-acre bay front campus is home to more than 800 students and 80 full-time faculty engaged in interdisciplinary research and collaborative learning. New College offers nearly 40 areas of concentration for undergraduates and a master’s degree program in Data Science.

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