Ключевые слова: ash, background, black, burning, carbon, charcoal, coal, cost, cube, dark, dirty, ecology, effect, energy, environment, equipment, exploitation, extract, extraction, factory, fire, firewood, flame, fossil, fuel, gas, geology, heat, hot, industry, lignite, manufacturing, material, mine, miner, mineral, nature, pile, pollution, power, production, resources, rock, smoke, stone, texture, textured, tiled, work, worker,