Ключевые слова: background, bituminous, black, burning, central heating, clean, coal, coal industry, companies, cost, dark, effect, energy, exploitation, export, extract, extraction, fuel, gas, heat, hot, import, industry, lignite, manufacturing, material, metallurgical, miner, mineral, mines, pictures, power, power station, prices, resources, smoke, stone, stove, texture, textured, tiled, types, unclean, uses of,