Urban construction often ignores the carbon footprint of excavated soils. Research indicates that these soils release significant amounts of carbon dioxide and methane, contributing to urban greenhouse gas emissions. New studies explore using biochar and soil capping to mitigate these emissions. By stabilizing carbon in the soil, these methods can turn a hidden emission source into a managed carbon sink.
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Interesting that we ignore the soil moved during city builds. Most carbon accounting focuses on concrete and steel, but the land disturbance itself has a cost.
The real question is whether this can be standardized for reporting. If it is not in the municipal building codes, developers have zero incentive to use biochar or capping.
Biochar sounds good in a lab, but I wonder about the logistics. Moving thousands of tons of soil is already expensive. Adding a biochar treatment step adds labor and material costs.
Agreed. I want to see the actual volume of emissions per cubic meter. Is this a meaningful climate win or just a rounding error compared to the energy used by the excavators?
