Living trees absorb carbon, aiding climate change mitigation. But what role do dead trees play in carbon storage? UVM researchers found that large, downed trees in streams tie up tremendous stores of carbon—and this pool of carbon storage is growing over time. Moreover, large trees in streamside forests proved important for recruiting carbon into streams over time—reflecting the environmental value of big, old trees. “We know that about 20% of global annual greenhouse gas emissions come from land use and deforestation,” University of Vermont professor and study author Dr. William Keeton said, “but we can also use forests and other land cover as what we call a natural climate solution—finding ways to sequester and store more carbon in vegetation.” Keeton had long suspected that water-bound wood in old-growth forests was surely storing carbon—but how much? Turns out, quite a lot.