a handful of dry technological wood chips. waste from the woodworking industry, fuel and raw materials for heating solid fuel

beige biomass birch boiler boilers brown business carpenter chip chips cutting deforestation dry dust ecology energy environment facility fuel ground handful hands heap heating holding huge industrial industry logging material materials mulch outside peeling pile power production raw recycle recycling renewable resources sawdust scraps shaving shavings shredded solid technological timber tree waste wood woodchip woodworking yellow zero