The biggest disadvantage of reliance on coal is that it

is difficult to transport.

has a low heating value.

is damaging to the environment to extract.

is used to power electricity-generating plants.

The biggest disadvantage of coal is that it will one day run out with how fast the economy is using it today. It also creates carbon dioxide, which is hard to breath and also clogs up the atmosphere, making it thicker and trapping more heat. a better alternative is wind, solar, and water energy. these are clean, electronic ways to power and save our world