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Björn Embrén: Porosity with Stone Biochar and Compost

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Björn Embrén from the City of Stockholm presents a revolutionary method for planting city trees and green areas. Biochar and compost are mixed with stones to create a substrate that allows water and air to pass through and does not compact. This not only strengthens urban trees, but also protects the city from flooding during stormwater events.

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