Ключевые слова: background, bituminous, black, central heating, coal, coal burning, coal mine, coal mining, coal plant, coal power plant, cube, dark, deposits, ecology, effect, energy, environment, exploitation, extract, extraction, fuel, gas, heat, hot, industry, lignite, manufacturing, material, metallurgical, mine, miner, mineral, mining, nature, pile, plant, power, power plant, power station, resources, smoke, stone, texture, textured, tiled, unclean, underground, wallpaper, winter,