Ключевые слова: background, bill, black, burn, carbon, co2, coal, dark, dough, energy, environment, environmental, fat, fire, fires, fossil, fossilizes, fuel, geology, heat, industry, isolated, macro, material, mine, mining, mining union, mirror, moola, nature, object, pit, pollution, primaval, putt, rags, reflection, rough, ruhr area, seam, stone, structure, subsoil, surface, texture, times, tunnel, underground, warmth, white,