Coal/kəʊl/ Definition 1 of 5Pro Tip 1/3Energy Source Coal is often associated with power generation and historical industrial use. Factories during the Industrial Revolution ran on coal. Pro Tip 2/3Environmental Concern Burning coal is controversial due to air pollution and climate change. Environmentalists advocate for a transition away from coal. Pro Tip 3/3Cultural Symbol Coal is a symbol of an old-fashioned way of heating and energy production. Old steam locomotives were fueled by coal.