Ключевые слова: alternative, background, bio, biomass, boiler, burn, business, cut, deforestation, ecology, energy, environment, fire, firewood, forest, forestry, fuel, green, harvest, harvesting, heating, industrial, industry, landscape, log, logging, lumber, material, natural, nature, outdoor, pellet, pile, pine, plant, power, recycling, renewable, renewable energy, resource, road, sky, source, stack, technology, timber, tree, trunk, wood, wooden,