Which of the following is a non-renewable energy source?

Coal is categorized as a non-renewable energy source because it is a fossil fuel formed from the remains of ancient plants and animals that have been subjected to heat and pressure over millions of years. The process of forming coal takes a very long time, and once it is extracted and consumed, it cannot be replenished within a human timescale. This makes coal a finite resource, and once depleted, it cannot be regenerated.

In contrast, solar energy, wind energy, and hydropower are all classified as renewable energy sources. Solar energy harnesses sunlight, which is continually available. Wind energy relies on the natural movement of air, which is also ever-present as long as there is sun and varying temperatures. Hydropower depends on the water cycle, which is driven by the sun and constantly replenishes itself. Thus, while they provide significant energy, they are sustainable and can be utilized without the fear of running out.