closeup shot of natural black coals for background. coal is the largest source of energy for the generation of electricity worldwi

abstract background black bonfire boulder burning burnt carbon catalyst charcoal closeup coal coals combustion copy cost cube dark ecology effect electricity energy environment exploitation extraction fire flame fuel gas generation heat hot industrial industry largest lignite macro manufacturing mine miner mineral natural nature pieces power pure resources rock shot smoke soot source space stone stove surface texture used wood worldwi worldwide