Ключевые слова: alternative, background, bio, biological, burn, close, closeup, compressed, consumption, cylinder, eco, ecologic, ecological, ecology, economy, energy, environment, environmental, fire, fireplace, forest, fuel, heat, mass, matches, material, natural, nature, pattern, pelletfuel, pellets, pile, pine, power, pressed, recycling, roll, roller, safe, seasonal, set, solid, stove, texture, timber, warmth, wood, wooden,