What We Do
We remove CO₂ from the atmosphere by storing dry densified wood waste aboveground.
Trees capture CO₂ efficiently, but they emit CO₂ when they die and decay. We can sequester that carbon for millennia by preserving dry wood in containers.
Why Store Dry Densified Wood?
Dry wood does not decompose. Dry wood resists decay to either CO₂ or methane below 85% relative humidity.
Low cost and energy-efficient. Tau combines free CO₂ capture by trees with energy-efficient processing steps to deliver durable CO₂ removal for less than $100/ton and less than 200 kWh/ton CO₂e. Our process CO₂ emissions can be as low as 5% of the carbon in the stored wood.
Compact storage. Tau’s densified wood blocks contain 5x more carbon than wood chips and 3x more carbon than logs. This allows us to store ~40,000 tons CO₂e of wood per acre in 20-foot tall containers.
Durable. Tau’s innovative container technology keeps the stored wood in a dry oxic (O₂-containing) environment, which stops all decomposition and guarantees no methane emissions. Tau’s rugged fiberglass containers last for centuries with minimal maintenance.
Verifiable. Tau’s stored wood can be physically inspected at any time, and the amount of stored carbon can be quantified with high precision.
Low environmental impact. Tau’s storage containers are aboveground, which means Tau does not disturb the soil by digging or drilling, nor does it disturb aquatic ecosystems by sinking terrestrial biomass.
For more information about aboveground dry wood storage as a CO₂ removal technology, download Puro.earth’s Terrestrial Storage of Biomass methodology.