Burning biomass merely releases the carbon the trees sequestered, but the trees are not sequestering carbon anymore. Biomass is often advertised as leftovers and byproducts, but is then 75% new wood. How is leveling a forest, releasing 101 units of pollution, and not having the trees around to sequester that carbon somehow better than mining carbon, releasing 100 units of pollution, and having the trees around to sequester carbon?
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