Ключевые слова: alternative energy, backgrounds, biofuel, biomass, biomasse, briquettes, brown, bundle, closeup, energy, environment, female, fireplace, firewood, fuel, fuel and power, group of objects, hand, handful, heap, horizontal, industry, manufacture, material, nature, organic, pellet, pellet gun, pellets, pine, scoop, selective focus, wood, wood chip, wood pellet, wood pellets,