Coal is a fossil fuel that formed from trees, ferns, and plant life that thrived along with the dinosaurs from 400 million to a billion years ago.
Over time these buried organic materials undergo a process of heat and pressure which gradually transform them into coal.
There is plenty of coal deposits in the world but the largest reserves are geographically located in China, the United States, Russia, India, Australia, and Indonesia which makes them the top coal producers and consumers in the world.