Car hugger.

Daimler subsidiary Moovel wants to give the electric Smart a actual ‘Green Skin.’ The planting has been going on for a while and testing is to commence in Stuttgart soon. If successful, the mossy Smart could filter about 7 kilos of CO2 from the air annually. A tree manages 2.6 tons/year, so forestation projects may still be slightly more effective.
automobilwoche.de (in German)