7 Disadvantages of Coal You Need to Know - Earthava
8. The Disadvantages of Coal Are Significant. 1. It Increases Carbon Dioxide in the Environment. Why Coal Ain't Cool: 7 Disadvantages of Coal You Need to Know. When we burn coal, it produces extra carbon dioxide, or CO2. CO2 causes a "greenhouse effect," which means it makes the planet retain more heat in the lower atmosphere.