Ключевые слова: background, bituminous, black, carbon, central heating, close, coal, companies, cost, cube, dark, effect, energy, environment, exploitation, extract, extraction, fire, fossil, fuel, gas, heat, hot, industry, lignite, lump, manufacturing, material, metallurgical, mine, miner, mineral, pictures, piece, power, power station, price, raw, resource, rock, smoke, stone, stove, texture, textured, tiled, types, unclean, uses of, winter,