In most soils, the wood decays as microbes munch on the cellulose, releasing methane and carbon dioxide. Mast has a different approach. The startup will entomb the trees in an area rich with clay ...

Seattle’s Mast Reforestation announced today $25 million in new funding and an expansion of its operations into “wood vaulting” in which carbon that’s captured in vegetation is locked away.

"One of the biggest expenses with reforestation is clearing dead, burned wood. It represents a huge future fire risk and a safety risk," said Maria Huyer, director of product at Mast. "We thought ...