The town of Differdange in Luxembourg has laid 200 tonnes of asphalt containing 3% biochar on Rue de l'Hopital, covering 1,650 square metres. Biochar is produced by heating biomass without oxygen, locking carbon into a stable form. The project aims to sequester six tonnes of carbon, roughly equal to one person's annual footprint, as part of Differdange's goal to reach carbon neutrality by 2030. The road will be monitored over two, four, and five years to check for cracking or deformation under traffic. The biochar asphalt costs 2 to 3% more than standard asphalt, but the construction work itself is priced the same. The pilot is a partnership between the municipality, the BAU Foundation, and asphalt firm Julien Cajot. If the trial succeeds, Differdange may expand use of biochar-enriched asphalt across its municipal road network. The approach turns road infrastructure into a carbon sink without changing how the road looks or functions for drivers.
