Ключевые слова: alternative, background, bio, burn, color, compressed, copy, eco, ecological, ecology, energy, environment, environmental, fire, flammable, flat, fuel, green, growing, heap, heat, heating, lay, leaves, light, many, natural, nature, nobody, object, pellet, pellets, pile, plant, power, recycling, renewable, resources, saving, seedling, space, sprouting, text, top, view, warm, white, winter, wood, wooden,