Plants naturally capture vast quantities of carbon dioxide. But when they decompose, that carbon is released back into the atmosphere. Rewind radically slows this cycle by preserving plant biomass in anoxic (oxygen-free) environments, where it can safely store carbon for thousands of years.
Rewind’s storage sites leverage two layers. The first is the natural anoxic conditions found deep underground and underwater, preserving plant carbon as solid matter for thousands of years. The second layer is a deep separation from the atmosphere, keeping the small quantities of decomposition products locked inside the storage site.
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Billions of tons of surplus plant biomass are produced each year, and vast geological storage sites including disused mines and marine basins exist globally. Given the scalability of these two resources (geological sites and biomass) Rewind’s model is forming a blueprint for removing carbon at gigaton scale.
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Naturally anoxic marine basins like the Black Sea preserve biomass on the seafloor. In addition, slow water-mixing patterns in such anoxic marine basins often provide a second layer of preservation, preventing particles and molecules from travelling up the water column and meeting the atmosphere. The Danube river, for example, carries a million tons of organic carbon to the bottom of the Black Sea every year.
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