What type of fuel is coal classified as?

Coal is classified as a non-renewable fuel because it is formed over millions of years from the remains of ancient plants and animals subjected to heat and pressure under the Earth's surface. This geological process takes an extremely long time, meaning that once coal reserves are depleted, they cannot be replenished within a human timescale. Non-renewable resources like coal are finite; their extraction and use diminish their availability for future generations.

In contrast, renewable fuels are those that can be replenished naturally in a short time, such as solar, wind, or hydropower. Biomass refers to organic materials that can be used for energy, but this is distinct from coal, which is a fossil fuel. Natural gas is also a fossil fuel derived from decomposed organic matter but is a separate category from coal. Understanding these classifications is crucial in discussions about energy sources and sustainability.